阅读说明：本技术 一种基于射流泵供水诱鱼的方法 (Method for attracting fish by supplying water based on jet pump ) 是由 侯轶群 龙新平 李德旺 龚昱田 蔡露 陶江平 于 2021-09-03 设计创作，主要内容包括：本发明公开了一种基于射流泵供水诱鱼的方法,包括射流泵和供水管道,供水管道的一端置于拦水坝前上游河道内,利用中高水头坝体所提供的高压水流,将水体引入射流泵,通过射流泵工作管的高压小流量水流抽吸下游尾水,通过流体混合管和扩散管后转换为低压的大流量水流,形成吸引鱼类洄游的流速流量条件,具体步骤包括根据诱鱼所需的诱鱼流场确定射流泵要提供的出口流量和出口流速,根据求出的射流泵的喉管与喷嘴的面积比、射流泵的工作管和吸入口的设计流量等参数设计合适的射流泵,射流泵的出口流场应用于为诱鱼提供诱鱼所需的流场,该射流泵不凭借外界能源输入供给工作流体,节约了能源,有效地解决直接在拦河坝下游通过离心泵制造低速且高流量的诱鱼水流时能耗过高的问题。(The invention discloses a method for water-supplying fish luring based on a jet pump, which comprises the jet pump and a water supply pipeline, wherein one end of the water supply pipeline is arranged in an upstream riverway in front of a check dam, a water body is introduced into the jet pump by utilizing high-pressure water flow provided by a dam body with a medium-high water head, downstream tail water is sucked by high-pressure small-flow water flow of a working pipe of the jet pump, and is converted into low-pressure large-flow water flow after passing through a fluid mixing pipe and a diffusion pipe to form a flow velocity and flow rate condition for attracting fish migration, the specific steps comprise determining outlet flow and outlet flow velocity to be provided by the jet pump according to a fish luring flow field required by fish luring, designing a proper jet pump according to the calculated area ratio of a throat pipe and a nozzle of the jet pump, the design flow rates of the working pipe and a suction inlet of the jet pump and the like, the outlet flow field of the jet pump is applied to provide an external flow field required by fish luring for the fish luring, and the jet pump does not input working fluid by energy, the energy is saved, and the problem of overhigh energy consumption when the low-speed and high-flow fish luring water flow is directly manufactured at the downstream of the barrage through a centrifugal pump is effectively solved.)

1. A method for attracting fish by supplying water based on a jet pump is characterized by comprising the jet pump, a water supply pipeline and a fish collecting channel, wherein the upper end of the water supply pipeline is arranged at the upstream of a barrage, the lower end of the water supply pipeline is arranged at the downstream of the barrage, the inlet of the jet pump is communicated with the lower end of the water supply pipeline, the water outlet of the jet pump is arranged beside the inlet of a fish passing facility in parallel, and the water outlet and the suction inlet of the jet pump are shielded by a net grid;

the method for obtaining the jet pump basic design parameters and selecting the jet pump according to the fish luring flow Qg and the fish luring flow velocity v comprises the following steps:

the jet pump forms a fish luring flow beside the inlet of the fish passing facilityThe quantity is Qg, the fish luring flow velocity is v, the outlet head of the jet pump is hc-0.5 rho v²/ρg；

According to the formula:calculating the optimal area ratio m of the throat to the nozzle in the jet pump_yWherein h ═ hc/h₀,h₀In order to introduce the lift of the power liquid of the jet pump, namely the water head difference of the upper end and the lower end of a water supply pipe,the flow velocity coefficient of the nozzle is within the range of 0.95-0.975;

m is to be_yReplace m and according to m_ySubstituting the value of (A) into the following formula to obtain the performance coefficient h₀And q is₀:

When m is 1 to 3, q is₀＝(5m-0.9445)^0.5-1.75，h₀＝2.667-0.0023(m+26.07)²；

When m is 3 to 40, q is₀＝(5m-0.94)^0.5-1.7，h₀＝1.45m^-0.892；

The obtained coefficient of performance h₀And q is₀Substituting the following formula:

obtaining the volume ratio Q of the fluid sucked by the jet pump to the power liquid, wherein Q is Q_s/Q₀,Q_sFor volumetric flow of the fluid to be sucked, Q₀For volumetric flow of motive fluid, Q_s+Q₀Determining the volume Q of the fluid sucked by the jet pump according to the fish luring flow Qg and the volume ratio Q_sAnd volume of motive fluid Q₀；

Using basic design parameters q, h and m_y、Q_s、Q₀A jet pump was selected as the reference condition.

2. The method for luring fish by supplying water based on the jet pumps as claimed in claim 1, wherein the outlets of the n jet pumps are arranged in parallel beside the inlet of the fish passing facility, and the outlet flow rate of each jet pump is Qg', nQg ═ Qg.

3. The method for attracting fish by supplying water based on the jet pump as claimed in claim 2, wherein the jet pump comprises a working pipe, a fluid mixing pipe and a diffusion pipe, the outlet end of the working pipe is nested in the mixing pipe, the outlet of the working pipe does not exceed the tail end of the mixing pipe, one end of the mixing pipe is closed, the other end of the mixing pipe is open, a throat pipe is further arranged between the mixing pipe and the diffusion pipe, the pipe diameter of the throat pipe is smaller than the pipe diameter of the mixing pipe and the diffusion pipe, the outlet end of the working pipe penetrates through the closed end of the mixing pipe, the tail end of the throat pipe is connected with the diffusion pipe, and the circumferential pipe wall of the mixing pipe is provided with suction ports; the inlet of the jet pump is the inlet end of the working pipe, and the outlet of the jet pump is the outlet end of the diffusion pipe.

4. The jet pump-based water supply fish luring method as claimed in claim 2, wherein the number of the suction ports formed on the wall of the mixing pipe is plural.

5. The jet pump-based water fish luring method as claimed in claim 2, wherein the working pipe is provided with a nozzle at its end.

Technical Field

The invention relates to the technical field of swimming fish flow fields with dams, in particular to a method for attracting fish by supplying water based on a jet pump.

Background

The construction of the dam influences the inhabitation and the reproduction of fishes in a river water body, the construction of a water conservancy dam project can relieve flood disasters at the downstream of a river, regulate and store downstream water resources and obtain clean energy, but the water conservancy dam project divides a natural river into an upper unit and a lower unit, a migration channel of the fishes is cut off, and the gene exchange of fish populations is influenced. The fish passing facility is taken as an important ecological compensation measure of a river-blocking building and receives more and more attention. The import layout is always the most important and technical problem in design, and many cases of failure of the modern fishway are attributed to the fact that the import of the fishes cannot be found or the difficulty of entering the fishes is high. The entrance of the fish-passing facility is small in size, only accounts for 1% of the width of the dam, the amount of the fish-passing facility on the two-dimensional plane is equivalent to a needle eye, the competitiveness of the small-size and small-flow fishway entrance outflow relative to the main flow is weak, and the fish cannot be effectively sensed. In order to solve the problem, a part of fish luring water flow is added on the basis of inlet and outlet flows, and the method is an important engineering means for improving the fish luring rate. The foreign guidance indicates that the competitiveness of the total fish luring water flow (import outflow + additional fish luring water flow) mainly depends on momentum (momentum is jet speed multiplied by water mass per unit time), and the larger the momentum is, the wider the influence of tail water injected into a power station is, and the higher the probability of being perceived by fishes is. The jet velocity is not too high, and the jet velocity is required to fall within the range of the approach velocity of the fishes as much as possible, and the larger the water mass per unit time, i.e. the size of the flow index, is, the easier the fishes are attracted. The current fish luring water flow of the fish facility generally comes from the following two types:

(1) direct introduction from a reservoir above the dam: due to the height difference between the upstream and the downstream of the dam body, if the flow velocity from the reservoir area directly to the downstream is often up to more than 10m/s, and the flow velocity required by the fish luring water flow is generally 0.4-1.0m/s, the fish luring water flow can be obtained only by reducing the flow velocity through energy dissipation, and energy dissipation facilities are required to be additionally laid.

(2) A pump station unit is arranged near the inlet under the dam: most of the existing fish-passing facilities are that an axial flow pump group arranged near an inlet directly pumps water and pressurizes in a downstream river channel to generate large-flow fish-attracting water flow, a pump body converts electric energy into kinetic energy of the large-flow fish-attracting water flow with proper flow speed, and a large amount of electric energy needs to be consumed in order to generate large enough fish-attracting water flow.

Disclosure of Invention

In order to solve the technical problems, the invention aims to replace the original axial flow pump by a jet pump which does not need electric energy, only introduces a small water flow of a high water head on a dam, attracts a large-flow and appropriate-flow fish luring water flow of the surrounding water body at a water outlet through a jet pump structure, and converts gravitational potential energy into water body kinetic energy in an energy process. Compared with the high-water-head gravitational potential energy power generation → electric energy → water body kinetic energy conversion process of an axial flow pump, the jet pump is adopted to directly convert the high-water-head gravitational potential energy → water body kinetic energy to be high in energy utilization rate, small in noise, small in occupied space and high in cleanliness.

In order to achieve the purpose, the technical idea of the invention is to provide a method for selecting the jet pump according to the outlet flow and the outlet flow rate to be provided by the jet pump, and the proper jet pump is selected according to the solved area ratio of the throat pipe and the nozzle of the jet pump and the design flow of the working pipe and the suction inlet of the jet pump, so that the jet pump is applied to providing a fish luring flow field for fish luring, and the energy consumption is saved.

The invention adopts the following technical scheme: a method for attracting fish by supplying water based on a jet pump comprises the jet pump, a water supply pipeline and a fish collecting channel, wherein the upper end of the water supply pipeline is arranged on an upstream irrigation ditch, the water supply pipeline or a small pipe preset in a dam body, the pipe orifice of the small pipe needs to be lower than the dead water level of a reservoir area in terms of elevation, the lower end of the water supply pipeline is arranged at the downstream of a barrage dam, the inlet of the jet pump is communicated with the lower end of the water supply pipeline, the jet pump is arranged beside the inlet of a fish passing facility in parallel, and the water outlet and the suction inlet of the jet pump are shielded by a net grid.

The method for obtaining the jet pump basic design parameters and selecting the jet pump according to the fish luring flow Qg and the fish luring flow velocity v comprises the following steps:

the flow rate of fish luring formed by the jet pump is Qg, the flow rate of the fish luring is v, and the outlet head of the jet pump is hc-0.5 rho v²/ρg；

According to the formula:calculating the optimal area ratio m of the throat to the nozzle in the jet pump_y，

h＝hc/h₀,h₀In order to introduce the lift of the power liquid of the jet pump, namely the water head difference of the upper end and the lower end of a water supply pipe,the flow velocity coefficient of the nozzle is within the range of 0.95-0.975;

m is to be_yReplace m and according to m_ySubstituting the value of (A) into the following formula to obtain the performance coefficient h₀And q is₀:

When m is 1 to 3, q is₀＝(5m-0.9445)^0.5-1.75，h₀＝2.667-0.0023(m+26.07)²；

When m is 3 to 40, q is₀＝(5m-0.94)^0.5-1.7，h₀＝1.45m^-0.892；

The obtained coefficient of performance h₀And q is₀Substituting the following formula:

obtaining the volume ratio Q of the fluid sucked by the jet pump to the power liquid, wherein Q is Q_s/Q₀,Q_sFor volumetric flow of the fluid to be sucked, Q₀For volumetric flow of motive fluid, Q_s+Q₀Determining the jet flow according to the fish luring flow Qg and the volume ratio qVolume of fluid sucked in by pump Q_sAnd volume of motive fluid Q₀；

Using basic design parameters q, h and m_y、Q_s、Q₀And designing a jet pump with proper specification as a parameter.

Preferably, the water outlets of the n jet pumps are arranged in parallel beside the inlet of the fish passing facility, and the outlet flow rate of each jet pump is Qg', and n Qg ═ Qg.

Advantageously, when the design time fish luring flow rate Qg is too large, the size of the selected jet pump outlet is larger than the downstream water depth under some working conditions, which may cause aeration during operation, n jet pumps with the same parameters can be used together to provide enough fish luring flow rate Qg, and the outlet flow rate of each jet pump is Qg'.

Preferably, the jet pump comprises a working pipe, a fluid mixing pipe and a diffusion pipe, wherein the outlet end of the working pipe is nested in the mixing pipe, the outlet of the working pipe is not more than the tail end of the mixing pipe, one end of the mixing pipe is closed, the other end of the mixing pipe is open, a throat pipe is further arranged between the mixing pipe and the diffusion pipe, the pipe diameter of the throat pipe is smaller than the pipe diameters of the mixing pipe and the diffusion pipe, the outlet end of the working pipe penetrates through the closed end of the mixing pipe, the tail end of the throat pipe is connected with the diffusion pipe, and suction ports are formed in the circumferential pipe wall of the mixing pipe; the inlet of the jet pump is the inlet end of the working pipe, and the outlet of the jet pump is the outlet end of the diffusion pipe.

Preferably, the number of the suction ports arranged on the wall of the mixing pipe is multiple.

Preferably, the end of the working tube is provided with a nozzle.

The invention has the advantages that the jet pump with proper design flow of the working pipe and the suction inlet of the jet pump is designed according to the outlet flow and the outlet flow speed which are provided by the jet pump and the area ratio of the throat pipe and the nozzle of the jet pump, and is applied to providing fish luring water flow for fish passing facilities.

The jet pump is arranged beside the outlet of the fish collecting channel in parallel, water in a reservoir area of the barrage is directly led to the jet pump, high-pressure water flow provided by a dam body with a medium and high water head is effectively utilized, the high-pressure small water flow is converted into low-pressure large water flow under the action of the jet pump serving as a hydraulic transformer, a high-speed and low-flow field is manufactured in the downstream jet pump of the barrage, downstream river water outside the jet pump is sucked and ejected to form low-speed and high-flow fish luring water flow, namely, the flow speed and suction flow required by fish migration are formed, and the fish are induced to migrate to the inlet of a fish passing facility; in addition, the jet pump does not need external energy input to supply working fluid, saves energy, and effectively solves the problems of overhigh energy consumption and high noise when low-speed and large-flow fish luring water flow is directly manufactured at the downstream of the barrage through a centrifugal pump.

Drawings

FIG. 1 is a schematic structural diagram of a fish swimming flow field based on a centrifugal pump;

FIG. 2 is a schematic structural diagram of a jet pump-based fish swimming flow field of the invention;

FIG. 3 is a schematic view of the construction of the jet pump of the present invention;

wherein, the device comprises a jet pump 1, a working pipe 2, a mixing pipe 3, a throat 4, a diffusion pipe 5, a suction inlet 6, a spray nozzle 7, a fish luring water flow 8, a water supply pipe 9, a pressure gauge 10, a control valve 11, a water pump 14 and a barrage 15.

Detailed Description

The present invention will be described in further detail below with reference to the drawings, comparative examples, and specific examples, but the examples should not be construed as limiting the present invention.

Comparative example 1

As shown in fig. 1, a fish attracting flow field manufactured by supplying water based on an axial-flow pump comprises a water pump 14, a water supply pipeline 9 and a fish collecting channel 8, wherein the front end of the water supply pipeline 9 is immersed below the water surface of a downstream river behind a barrage 15 by taking the flowing direction of fluid as reference, the tail end of the water supply pipeline 9 is arranged beside the fish collecting channel 8 in parallel, the water supply pipeline 9 is provided with the water pump 14, a pressure gauge 10 and a control valve 11, and the outlet of the fish collecting channel 8 is communicated with the downstream river of the barrage.

When water is introduced into the fish collecting channel 8 from the downstream river channel behind the barrage 15 of the water supply pipeline 9, the water flow does not need to be lifted, and only pipeline loss and flow speed water head difference can be considered in the water flow allocation process. Based on the fish luring flow field supplied with water by the axial flow pump, the energy conversion process comprises the steps that water flow led out from a downstream riverway behind a dam drives a water turbine to rotate, a generator is driven to generate electricity, electric energy is transmitted to a motor through a power line, the motor drives a water pump to rotate through a coupler, water flow is sucked to the required flow velocity, and the electric energy is converted into mechanical energy of the water flow.

In the scheme for manufacturing the swimming fish flow field by supplying water to the water pump, the average efficiency of the hydroelectric generating set is 85 percent, the average efficiency of the motor is 90 percent, the transmission loss of the line is temporarily not considered, the efficiency of the coupler is 100 percent, the efficiency of the water pump is 70 percent, the power reserve coefficient K of the water pump is 1.5, the working lift of the selected axial flow pump is 3m, and the fish luring flow is 0.024m³The fish luring flow speed is 0.4-0.6 m/s, and the energy consumption is calculated as follows:

wherein eta turbine set is 0.85, eta transmission line is 1, eta motor is 0.9, eta coupling is 1, eta water pump is 0.7, k is 1.5, rho is 1000kg/m³、g＝9.8m/s2、Q＝0.024m³/s、H＝3m，

The final required energy consumption is 1.976 kW.

Example 1

As shown in fig. 2 and 3, a method for water-supplying fish luring based on a jet pump comprises a jet pump 1, a water supply pipeline 9 and a fish collecting channel 8, wherein the jet pump 1 comprises a working pipe 2, a fluid mixing pipe 3, a throat pipe 4 and a diffusion pipe 5, a flange is welded at the front end of the working pipe 2 by taking the flowing direction of the fluid as a reference, is used for connecting a water supply pipe 9, the upper end of the water supply pipe 9 is arranged at the upstream of the barrage 15 for water diversion, the lower end of the water supply pipe 9 is arranged at the downstream of the barrage 15, is arranged beside the outlet of the fish collecting channel 8 in parallel, the lower end of the water supply pipe 9 is communicated with the working pipe 2 of the jet pump 1, by utilizing the water level difference between the upstream and the downstream, the high-speed low-flow water flow is formed at the tail end of the working pipe 2, the tail end of the working pipe 2 passes through the closed end of the mixing pipe 3, and the pipe diameter of the working pipe 2 is smaller than that of the mixing pipe 3, and the length of the working pipe 2 in the mixing pipe 3 is not larger than that of the mixing pipe 3. The tail end of the mixing pipe 3 is connected with the front end of the throat pipe 4 through a reducing pipe, the tail end of the throat pipe 4 is connected with a small port of the diffusion pipe 5, and the outlet of the diffusion pipe 5 is expanded. The circumferential pipe wall of the mixing pipe 3 is provided with 2 suction ports 6, and the tail end of the working pipe 2 is provided with a nozzle 7.

As shown in fig. 2, in the fish luring scene, the jet pump 1 is provided with a pressure gauge 10 and a control valve 11 on the water supply pipe 9. The upper end of the water supply pipe 9 is arranged at the upstream of the barrage, the working pipe 2 of the jet pump 1 is connected with the outlet of the water supply pipe 9 beside the outlet of the fish collecting channel 8 at the downstream of the barrage 15, under the action of the water level difference at the upstream and the downstream, the water supply pipe 9 supplies working fluid to the jet pump 1, after the working fluid enters the jet pump 1, the working fluid is ejected out through the nozzle 7 of the working pipe 2, the suction fluid from the side of the fish collecting channel 8 enters the mixing pipe 3 from the self-suction inlet 6 and is mixed with the high-speed working fluid ejected out by the nozzle of the working pipe 2, and the high-speed working fluid is output through the diffusion pipe 5, and the working fluid at the high speed and the low flow rate is converted into the output fluid with the small flow rate and the small flow rate at the moment. The outlet of the diffusion pipe 5 is arranged beside the outlet of the fish collecting channel 8 in parallel, the outlet of the diffusion pipe 5 and the suction inlet 6 of the jet pump 1 are both shielded by the fish blocking net 13, and the outlet of the diffusion pipe 5 faces the outlet of the fish collecting channel 8. The number of the suction ports 6 arranged on the tube wall of the mixing tube 3 is multiple.

In actual use, through the flange mounting water supply pipe of the working pipe of the jet pump, place the jet pump beside the fish gathering channel 8 and submerge at the bottom, fix the front end of the water supply pipe at the upstream river channel of the barrage at this moment, and ensure that the front end of the water supply pipe is submerged under the water surface all the time. Considering that the dam body is a dam body with a medium-high water head, the water head can be 70 meters, the working fluid entering the jet pump has the water head of 70 meters, the working pipe of the jet pump sprays high-pressure and high-speed working water flow, under the entrainment action of the working fluid, the water body beside the fish collecting channel of the jet pump enters the jet pump from the suction inlet of the jet pump to form low-pressure suction fluid, and finally the working fluid and the suction fluid are converged to form mixed fluid which is discharged from the outlet of the jet pump to form a flow field required by fish migration. In the scheme of the jet pump for supplying water to manufacture the swimming fish flow field, the jet pump directly leads water from an upstream river channel in front of the barrage through a water supply pipeline, and the water flow energy is directly consumed.

In order to form a fish luring flow of 0.024m in the fish collecting channel 8 by using a jet pump³The fish luring water flow with the fish luring flow velocity v of 0.4-0.6 m/s needs to be introduced into the power hydraulic pressure and flow of the jet pump in the following technical process:

volume flow rate ratio Q ═ Q_s/Q0，Q_sFor volumetric flow of the fluid to be sucked, Q₀For volumetric flow of motive fluid, Q_s+Q₀＝0.024m³/s；

Pressure ratio h ═ Δ p_c/Δp₀，△p_cFor suction of fluid pressure increase, Δ p₀Is the power hydraulic pressure reduction amount; h ═ hc/h_p,h_pThe lift of power liquid introduced into the jet pump is the difference between the water levels of the upstream and the downstream of the water retaining dam;

in this example, the density ratioρ_sFor suction of fluid density, p₀Is the power fluid density;

area ratio m ═ A₃/A₀₁，A₃The cross-sectional area of the throat 4 flow path, A₀₁Is the cross-sectional area of the outlet of the nozzle 7;

by applying the basic principle of fluid mechanics, a momentum equation and a Bernoulli equation are applied to the jet pump in a subsection mode along the fluid flow direction, and a basic equation of the jet pump is deduced step by step:

the flow velocity coefficient of the nozzle is within the range of 0.95-0.975;

the flow rate coefficient of the throat pipe is in a value range of 0.975；

The value range is 0.9 for the flow velocity coefficient of the diffuser;

the flow velocity coefficient of the inlet section of the throat pipe is within the range of 0.8-0.85;

when the area ratio m is constant, the equation is nearly linear and can be simplified as a linear function:

h₀and q is₀Is a coefficient of performance, which is related to m, and is expressed as follows:

m＝1～3，q₀＝(5m-0.9445)^0.5-1.75，h₀＝2.667-0.0023(m+26.07)²(formula 3)

m＝3～40，q₀＝(5m-0.94)^0.5-1.7，h₀＝1.45m^-0.892(formula 4)

The pressure ratio h and the optimal area m can be obtained according to the envelope curve of the performance of the jet pump_yThe relation of (1):

considering that the built retaining dam is a medium-high water head dam, the reduction amount of the power hydraulic pressure is known, and the outlet head hc of the jet pump is equal to delta p_c/ρg＝0.5*ρ*v²The/[ rho ] g is 0.008-0.018 m, and v is 0.4-0.6 m/s, and h is 0.008/70 or 0.018/70;

when h is 0.008/70, m can be obtained from equation 5_y，m_y＝31.53～31.54；

By substituting formula 3 and formula 4, q can be obtained₀And h₀；q₀＝10.819～10.83，h₀＝31.487～31.503；

Substituting the formula 2 into the formula 2 to obtain the q which is 10.819-10.82;

therefore, the volumetric flow rate of the power liquid is 0.002m³(s) the volume flow of the suction fluid of the suction liquid is 0.022m³/s；

The energy required to be consumed is calculated as follows:

P＝ρgQ₀h₀

where ρ is 1000kg/m³、g＝9.8m/s²、Q₀＝0.0022m³/s、h₀＝70m。

The final required energy consumption was 1.393 kW. From the energy consumption perspective, the scheme of manufacturing the fish luring water flow by using the jet pump for supplying water is selected, the energy consumption of the scheme is superior to that of direct water supply by using the axial flow pump and is only equal to 70% of water supply energy consumption of the water pump.

When h is 0.018/70, m can be obtained from equation 5_y，m_y＝31.368～31.383；

By substituting formula 3 and formula 4, q can be obtained₀And h₀；q₀＝10.786～10.789，h₀＝31.35～31.36；

Substituting the formula 2 into the formula 2 to obtain q which is 10.786-10.789;

therefore, the volumetric flow rate of the power liquid is 0.002m³(s) the volume flow of the suction fluid of the suction liquid is 0.0219m³/s；

The energy required to be consumed is calculated as follows:

P＝ρgQ₀h₀

where ρ is 1000kg/m³、g＝9.8m/s²、Q₀＝0.00219m³/s、h₀＝70m。

The final required energy consumption was 1.396 kW. From the energy consumption perspective, the scheme of producing the fish luring water flow by using the jet pump for supplying water is selected, the energy consumption of the scheme is superior to that of direct water supply by using the axial flow pump and is only equivalent to 71 percent of water supply energy consumption of the water pump.

In the manufacturing process, according to the lift h of the power liquid introduced by the jet pump₀At 70 meters, the pressure in the operation is known as ρ gh₀＝68.6kg/cm²From<<The medium in the pipeline is commonly usedFlow rate range meter>>The liquid flow speed range v of the working pipe and the suction inlet is optimized_yAnd 2-3 m/s, calculating the following sizes of the working pipe and the suction inlet according to the volumetric flow of the power liquid, the volumetric flow of the suction liquid and the liquid flow velocity ranges of the working pipe and the suction inlet, and the diameters of the working pipe: dg 2 x (Q)₀/v_yΠ)^0.5The diameter Dx of the suction inlet is 2 (Q)_s/v_yΠ)^0.5。

The pipe diameter of the working pipe is DN32, the diameter of the large port of the diffusion pipe is DN250, the pipeline with the pipe diameter of DN80 can be selected as the suction inlet and is arranged on the pipe wall of the mixing pipe, the total length of the pump body is 1800mm, and the pump body is made of stainless steel so as to work underwater for a long time.

Preferably, when the fish luring flow rate Qg is too large in design, which results in the selected jet pump outlet size being larger than the downstream water depth under some conditions, n jet pumps with the same parameters can be used together to provide a sufficient fish luring flow rate Qg, and the outlet flow rate of each jet pump is Qg', n Qg ═ Qg.

The above-mentioned implementation methods of the present invention are not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations made by the present specification and the attached drawings, or directly or indirectly applied to the related technical fields, are included in the scope of the present invention. Details not described in the present specification belong to the prior art known to those skilled in the art.