Flow enhanced heat transfer device for controlling transverse streaming of cylinder
阅读说明：本技术 一种控制圆柱横向绕流的流动强化传热装置 (Flow enhanced heat transfer device for controlling transverse streaming of cylinder ) 是由 张小兵 谢鹏勇 于 2020-04-29 设计创作，主要内容包括：本发明公开了一种控制圆柱横向绕流的流动强化传热装置,包括散热器,散热器两端分别安装有上弹性振动器和下弹性振动器,正中心连接着振动的圆柱。通过控制上下弹性振动器从而控制圆柱的横向振动。本发明通过具有一定频率与振幅振动的振动器,显著增强了热壁面附近的换热能力,通过振动提高了热壁面附近的流体流动扰动程度,使得整体换热能力增强,从而达到利用振动实现散热器强化散热的目的。(The invention discloses a flow enhanced heat transfer device for controlling the transverse streaming of a cylinder, which comprises a radiator, wherein an upper elastic vibrator and a lower elastic vibrator are respectively arranged at two ends of the radiator, and the center of the radiator is connected with a vibrating cylinder. The transverse vibration of the cylinder is controlled by controlling the upper elastic vibrator and the lower elastic vibrator. The invention obviously enhances the heat exchange capability near the hot wall surface by the vibrator with certain frequency and amplitude vibration, and enhances the disturbance degree of fluid flow near the hot wall surface by vibration, so that the whole heat exchange capability is enhanced, thereby achieving the purpose of utilizing vibration to realize the enhanced heat dissipation of the radiator.)
1. The flow-enhanced heat transfer device for controlling the transverse streaming of the cylinder is characterized by comprising a radiator (1), wherein an upper elastic vibrator (2) and a lower elastic vibrator (3) are respectively installed at two ends of the radiator (1), the center of the radiator (1) is connected with a vibrating cylinder (4), the heat transfer device is further connected with an upper cam movable control mechanism (5) and a lower cam control mechanism (6) with adjustable frequency, a sealing device (7) is arranged outside the radiator (1), a sensor (8) is arranged on the radiator (1), and the sensor (8) is connected with a control system (9); the control system (9) is connected with the upper cam active control mechanism (5) and the lower cam control mechanism (6), and the upper cam active control mechanism (5) and the lower cam control mechanism (6) comprise a connecting rod (10), a guide rail (11) and a cam piston (12) which are sequentially connected; connecting rods (10) of an upper cam active control mechanism (5) and a lower cam control mechanism (6) are respectively connected with the elastic vibrator (2) and the lower elastic vibrator (3), wherein by utilizing the streaming of the cylinder (4), the vortex street of the cylinder (4) which transversely vibrates is formed and disappears at the same time, a Karman vortex street is formed behind the cylinder along a heat exchange channel of the radiator (1), and heat exchange is formed between fluid and a hot wall surface; the vibration frequency and amplitude of the cylinder (4) are controlled by the upper elastic vibrator (2) and the lower elastic vibrator (3); meanwhile, the upper elastic vibration device and the lower elastic vibration device can dynamically adjust the frequency and the amplitude of the vibration devices in time through the control system (9) according to the change of the speed, the pressure and the temperature of the fluid.
2. The flow enhanced heat transfer device for controlling the cross-flow around a cylinder of claim 1, wherein the heat transfer device has a structural size of 50mm x 1000mm, a cylinder diameter of 10mm, and a vibration range of-10 mm to 10 mm.
3. The flow enhanced heat transfer device for controlling the lateral circumfluence of the cylinder as recited in claim 1 is characterized in that the cylinder (4) can dynamically and adaptively adjust the frequency and amplitude according to the enhanced heat transfer requirement, thereby controlling the turbulent flow strength.
Technical Field
The invention relates to a flow enhanced heat transfer device for controlling transverse cylindrical streaming, belonging to the field of high-efficiency heat exchanger plates.
Background
With the development of industrial economy, the energy demand is getting larger and larger, and social production is increasingly faced with the problem of short and short environment and resources, so that efficient, energy-saving and environment-friendly heat exchangers are needed, especially in some high-energy-consumption fields, such as thermal power plants, petrochemicals, steel, machinery and some air-conditioning refrigeration fields. Therefore, a plurality of novel efficient thermal control management structural devices and thermal control management schemes are researched and developed. The invention provides an automatic thermal control management technical scheme by combining the existing thermal control management means for enhancing heat transfer with the existing automatic control technology, so as to realize thermal control management with high efficiency, environmental protection and energy saving. The traditional enhanced heat transfer means only relies on a fixed fin technology, and the enhanced heat transfer is realized by changing the roughness indicated by the structure and increasing the contact area. Or by increasing the flow rate to increase the convective heat transfer coefficient. Although these solutions can improve the flow heat exchange performance considerably. However, with the development of industry, in fact, in some fields, the heat exchange amount is not constant, and if the heat exchange equipment of the existing fixed turbulence generator is continuously adopted by the heat flux density which is dynamically changed, the problems of resource waste and heat exchange efficiency reduction are inevitable. Therefore, a thermal control management technical scheme which can meet the requirement of heat transfer enhancement and realize energy-saving and environment-friendly dynamic regulation and control of heat transfer is researched and developed.
Conventional means of enhanced heat transfer are based on fixed turbulators, such as the common finned tubes, and various spherical, grooved, and wedge-shaped heat exchanger designs. The overall heat transfer theory is based on the fluid turbulence enhancing heat exchange with the hot wall surface. In addition, some compact heat exchangers rely on a large heat transfer area, which increases the contact surface with the fluid to achieve enhanced heat transfer. However, these structures have drawbacks in terms of dynamic heat flux density requirements, and although heat transfer is satisfactory, this increases energy consumption.
In the aerospace field, when an aircraft flies at a high speed, the power of an engine is dynamically changed, and at the moment, the wall of a combustion chamber of the engine suffers from dynamic heat flow density, so that if a dynamic thermal control management technology can be adopted, efficient and energy-saving thermal control management of the aircraft can be realized. At the moment, if the large vortex generator under high heat flow density is still adopted, although the heat exchange cooling requirement can be met, the energy consumption which needs to be avoided is greatly increased, the heat exchange efficiency of the heat exchange equipment is reduced, and the performance of the aircraft is reduced. It is therefore necessary and efficient to employ dynamically controllable thermal management means.
Disclosure of Invention
The invention aims to provide a flow enhanced heat transfer device for controlling the transverse streaming of a cylinder, aiming at the harsh environment that the existing heat equipment suffers from high-strength dynamic heat flux density and aiming at the condition that the existing traditional fixed vortex generator cannot well solve the problem and combining an automatic control regulation and control technology with the existing enhanced heat transfer means.
The technical scheme for realizing the purpose of the invention is as follows:
a flow enhanced heat transfer device for controlling the transverse streaming of a cylinder comprises a radiator, wherein an upper elastic vibrator and a lower elastic vibrator are respectively arranged at two ends of the radiator, the center of the radiator is connected with a vibrating cylinder, and is also connected with an upper cam movable control mechanism and a lower cam control mechanism with adjustable frequency; the control system is connected with the upper cam active control mechanism and the lower cam control mechanism, and the upper cam active control mechanism and the lower cam control mechanism comprise a connecting rod guide rail and a cam piston which are sequentially connected; connecting rods of the upper cam movable control mechanism and the lower cam control mechanism are respectively connected with the elastic vibrator and the lower elastic vibrator, wherein a karman vortex street is formed on the rear surface of the cylinder along a heat exchange channel of the radiator by utilizing the cylindrical streaming and the formation and disappearance of a cylindrical vortex street which transversely vibrates, and heat exchange is formed between fluid and a hot wall surface; controlling the frequency and amplitude of the vibration of the cylinder by the upper elastic vibrator and the lower elastic vibrator; meanwhile, the upper elastic vibration device and the lower elastic vibration device can dynamically adjust the frequency and the amplitude of the vibration devices in time through the control system according to the change of the fluid speed, the pressure and the temperature, so that the comprehensive regulation and control of the heat exchange strength are realized, and the overlarge pressure drop loss is avoided while the heat exchange capacity is enhanced.
The structure size of the heat exchange device is 50mm x 1000mm, the diameter of the cylinder is 10mm, and the vibration range is-10 mm.
Compared with the prior art, the invention has obvious advantages
1. The state of the vortex generator is changed through the mechanical control mechanism, so that the heat transfer performance is influenced, and the structural state of the heat exchanger is dynamically changed in time according to the requirement of the heat exchange capacity, so that the dynamic optimization of the heat exchange capacity is realized; 2. in the working process, the automatic control mechanism can process the feedback of the temperature, the fluid flow rate and the pressure change sensor according to the temperature of the hot wall surface and feed the feedback to the mechanical device through a computer, so that the working state of the vortex generator is changed in time, and the heat exchange capacity is adjusted, thereby realizing the improvement of the comprehensive heat exchange performance.
Drawings
FIG. 1 is a schematic diagram of a basic device and structure for dynamically controlling enhanced heat transfer.
Fig. 2 is a schematic diagram of the automatic control principle.
Fig. 3 is a schematic diagram of the control mechanisms 5 and 6 of fig. 1.
The flow-enhanced heat transfer device for controlling the transverse streaming of the cylinder in fig. 1 comprises a radiator 1, wherein an upper
Detailed Description
The invention will be further explained with reference to the drawings
The invention aims at the harsh environment that the existing heat equipment suffers from high-strength dynamic heat flux density, aims at the condition that the existing traditional fixed vortex generator cannot well solve the problem, combines an automatic control regulation and control technology with the existing enhanced heat transfer means, researches and develops an enhanced heat transfer device and a scheme for dynamically controlling cylindrical streaming, and expects to solve the heat transfer problem. The device can feed back to a control system through a sensor according to the change of heat flow density and heat exchange strength, and then dynamically adjusts the structure of the vortex generator by controlling a mechanical vibration device, thereby realizing the optimization of the comprehensive performance of heat exchange.
The invention combines the automatic control principle and the turbulence enhanced heat transfer technology on the basis of the traditional fixed vortex generator structure, and meets the requirement of enhanced heat transfer of high-intensity dynamic heat flow density change through improvement. The invention has stronger dynamic control and feedback regulation capability and can be suitable for various heat transfer fields with high heat flow dynamic density change.
The enhanced heat transfer structure of the dynamic control turbulence generator is shown in figure 1, and comprises a radiator 1, wherein an upper
As shown in fig. 2, the automatic dynamic control and adjustment system receives parameter signals such as temperature, pressure and speed through a sensor, feeds the parameter signals back to the control system, and outputs control signals to the mechanical mechanism through data processing of the control system, wherein the control signals are mainly a cam piston device, and the control and adjustment of the dynamic mechanism are performed by controlling the frequency and the piston amplitude of a motor.
According to the prior art, the enhanced heat transfer device adopting the fixed vortex generator is easy to cause local heat transfer deterioration, and the new dynamic heat transfer enhanced heat transfer structure can effectively reduce the phenomenon, so that the heat transfer is more prone to uniformity. The heat transfer requirement of high-intensity dynamic heat flow density change can be met by reasonably arranging the position and the state of the dynamic vortex generator. .
The invention combines the traditional fixed vortex enhanced heat transfer technology and the mature automatic control technology to realize the control of dynamic control of the flowing vortex and the feedback regulation control, thereby not only meeting the requirement of timely regulating the state of the vortex generator by the change of the dynamic heat flux density, but also greatly increasing the flowing heat transfer capacity in the whole heat exchanger by mainly regulating the vibration frequency, the amplitude and the balance position of the cylinder, which causes the dynamic vortex change of the vortex, the dynamic vortex change and the formation of the karman vortex street. Meanwhile, the occurrence of local heat transfer deterioration phenomenon and excessive consumption of energy sources can be avoided. The novel heat exchanger structure is efficient and energy-saving.
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