阅读说明：本技术 喷水推进器进流口稳流器 (Water-jet propeller inlet flow stabilizer ) 是由 韩玉军 于 2020-05-19 设计创作，主要内容包括：安装于船体上的喷水推进器处于工作状态时,喷水推进器入流口(2)处的进流有一部分为贴近船体(C)部分流动的水流,根据边界层理论这部分水流的速度梯度大且小于船速,该部分由船体导致的非均匀入流对推进系统的效率影响很大。本发明旨在稳定进流口流速,消除进流口不均匀流速对喷水推进器效率的影响。可以实现的工程上的效果是：通过在入流口处沿来流方向设置一组鳍片,以修正来流流向,稳定入口流速。所提出的实现这一喷水推进器进流稳流器包括：一个进流格栅(1)；一组进流孔(2)；一组稳流鳍片(3)。根据模型试验结果,所述喷水推进器进流稳流器技术效果在入流口处速度分布均匀、流线分布均匀,流动分离流场精细。(When the water jet propeller arranged on the ship body is in a working state, part of inflow at the inflow opening (2) of the water jet propeller is water flow flowing close to the ship body (C), the speed gradient of the part of water flow is large and is smaller than the ship speed according to the boundary layer theory, and the non-uniform inflow caused by the ship body in the part has great influence on the efficiency of a propulsion system. The invention aims to stabilize the flow velocity of the inflow opening and eliminate the influence of the uneven flow velocity of the inflow opening on the efficiency of the water-jet propeller. The engineering effect that can be realized is: a group of fins is arranged at the inflow opening along the inflow direction to correct the inflow direction and stabilize the inlet flow speed. The proposed flow stabilizer for realizing the water jet propeller comprises: an inflow grille (1); a set of inflow holes (2); a group of steady flow fins (3). According to the model test result, the technical effect of the inflow current stabilizer of the water-jet propeller is that the speed distribution at the inflow opening is uniform, the flow line distribution is uniform, and the flow separation flow field is fine.)

1. Water jet propulsion advances a class mouth current regulator includes: an inflow grille (1) is arranged on the inflow opening at the bottom of the ship; a group of inflow holes (2) distributed on the inflow grille; a group of steady flow fins (3) which play a role in correcting the flow direction of the inlet water and stabilizing the flow speed of the inlet water.

2. The water jet propeller inlet flow stabilizer of claim 1, characterized in that: a group of inflow holes are distributed on the inflow grille, and the edges of the inflow holes are designed to be rounded so as to eliminate inflow vortex.

3. The water jet propeller inlet flow stabilizer of claim 1, characterized in that: a group of flow stabilizing fins are distributed between the inflow holes of the inflow grille, the height of the flow stabilizing fins in the inflow direction is 0.5-1.8 times of the length of the inflow holes, and the flow stabilizing fins are gradually reduced to the tail end of the inflow holes along the defluidization direction and are flush with the inflow grille.

4. The water jet propeller inlet flow stabilizer of any one of claims 1 to 3, characterized in that: the flow stabilizing fins are in the shape of fish fins.

5. The water jet propeller inlet flow stabilizer of any one of claims 1 to 4, wherein: the flow stabilizing fins and the water inlet grating are integrally processed and formed or are independently processed and formed and then assembled into a component module.

Technical Field

The invention relates to the field of ship manufacturing, and aims to stabilize the flow velocity of a flow inlet of a water-jet propeller and eliminate the influence of uneven flow velocity of the flow inlet on the efficiency of the water-jet propeller.

Background

The water jet propulsion technology appears very early, but the development of the technology in nearly thirty years enters a new stage, and more high-power water jet propellers are applied to large high-performance ships with high requirements on the navigational speed. Similar to the principle of an aircraft engine, the water jet propeller generates thrust by utilizing the momentum difference of water flow sucked and sprayed by the propeller to push a ship to advance, and the ship is controlled by distributing and changing the jet flow direction through a steering mechanism, so that the ship provided with the water jet propeller often has excellent maneuverability.

When the water jet propeller arranged on the ship body is in a working state, part of inflow of the inflow opening of the water jet propeller is water flow flowing close to the ship body, the speed gradient of the part of water flow is large and is smaller than the ship speed according to a boundary layer theory, the part of non-uniform inflow caused by the ship body has great influence on the efficiency of a propulsion system, and students and research institutions in various countries in the world invest a great deal of energy to research the problem.

Disclosure of Invention

The invention mainly aims to produce a flow stabilizer which can stabilize the flow velocity of a flow inlet of a water-jet propeller and eliminate the influence of the uneven flow velocity of the flow inlet on the efficiency of the water-jet propeller. According to the invention, the group of flow stabilizing fins is arranged at the inflow opening along the inflow direction so as to correct the inflow direction and stabilize the inlet flow speed. The water-jet propeller inflow current stabilizer has the technical effects that the speed distribution at the inflow opening is uniform, the streamline distribution is uniform, the flow separation flow field is fine, and the structure of the effective utilization of fluid power is simple and the manufacture is convenient.

The realized engineering effect is as follows: a group of flow stabilizing fins are arranged at the inflow opening along the inflow direction to correct the inflow direction and stabilize the inlet flow speed.

The proposed flow stabilizer for realizing the water jet propeller inlet comprises: an inflow grille (1); a set of inflow holes (2); a group of steady flow fins (3).

The water-jet propeller inflow port current stabilizer is characterized by being provided with an inflow grille (1), a group of inflow holes (2) are formed in the inflow grille, and a group of current stabilizing fins (3) are distributed between the inflow holes along the inflow direction.

In a special case of the design, the cross section of the inflow opening of the inflow grate is elliptical, and the smooth inflow opening is of great importance for the inflow uniformity.

In a special case of the design, the sum of the inlet grille opening areas should be greater than the nozzle opening area.

In a special case of the design, the flow stabilizing fins are convergent curved surfaces in the inflow direction.

Drawings

The essence of the invention is explained with 2 figures. FIG. 1 shows a side view of a water jet propulsion unit with an inflow stabilizer mounted to the hull; fig. 2 is a perspective view of the inflow stabilizer of the water jet propeller.

Detailed Description

The water jet propeller inlet flow stabilizer shown in fig. 1 and 2 includes: an inflow grid (1) which is provided with a group of inflow holes (2) and the cross section of which is elliptical; a group of steady flow fins (3).

Two surfaces of an inflow hole (2) in the inflow grating (1) are designed to be in round angle transition, so that the vortex formed by the opposite inflow of sharp-angle edges is eliminated, the smoothness of an inflow flow field is improved, and the propulsion efficiency is further improved.

The flow stabilizing fins (3) are designed along the incoming flow direction (A) and are contracted along the outgoing flow direction (B) so as to correct the non-uniform flow field of the incoming flow, so that the speed distribution at the position of the inlet is uniform, the streamline distribution is uniform, the flow separation flow field is fine, and the efficiency of the propeller is improved.

According to the result of the model test, the technical effect of the water-jet propeller inlet flow stabilizer is that the speed distribution at the inlet (2) is uniform, the streamline distribution is uniform, and the flow separation flow field is fine.

Industrial applicability

As indicated above, the present invention is intended for use in surface craft, for a wide variety of boat types, mainly catamarans, trimarans, yachts, landing boats, patrol boats, displacement boats, planing boats, and the like.