CN-121993294-A - Wide-speed-range self-adaptive structure and method for regenerative cooling channel

CN121993294ACN 121993294 ACN121993294 ACN 121993294ACN-121993294-A

Abstract

The invention belongs to the field of regenerative cooling channels, and particularly relates to a wide-speed-domain self-adaptive structure and method of a regenerative cooling channel. The structure comprises a spoiler and a metamaterial elastic connecting piece, wherein one end of the spoiler is connected with the metamaterial elastic connecting piece, the other end of the spoiler is fixed on the wall surface of the air flow channel, the metamaterial elastic connecting piece is configured to form an acute angle with the wall surface of the flow channel in a balanced state, and the spoiler is configured to reduce the angle with the wall surface of the flow channel along with the increase of the fluid flow under the action of fluid, so that the self-adaptive adjustment of enhancing heat exchange at low flow rate and reducing resistance at high flow rate is realized. According to the invention, the inclination angle is automatically adjusted by the movable spoiler under the action of the fluid, so that the wide-speed-range heat management of enhancing heat exchange at low flow and reducing resistance at high flow is realized.

Inventors

LI YIHANG
PAN YU
CHEN JIAN
YUAN XUEQIANG
YANG KAI
ZHAN TAOTAO
JIANG TAO

Assignees

中国人民解放军国防科技大学

Dates

Publication Date: 20260508
Application Date: 20260319

Claims (10)

1. A wide-speed-domain adaptive structure for a regenerative cooling channel, disposed in an air or liquid flow path, the structure comprising: spoiler, and A metamaterial elastic connection; one end of the spoiler is connected with a metamaterial elastic connecting piece, and the other end of the spoiler is fixed on the wall surface of the air flow channel; The metamaterial elastic connecting piece has a programmable rigidity characteristic and is configured to form an acute included angle with the wall surface of the runner in a balanced state; The spoiler is configured to reduce an included angle between the spoiler and the wall surface of the flow channel along with the increase of the flow rate of the fluid under the action of the fluid, so that the self-adaptive adjustment of enhancing heat exchange at low flow rate and reducing resistance at high flow rate is realized.
2. The wide-speed-domain adaptive architecture of a regenerative cooling channel of claim 1, further comprising a fixed plate secured to a wall of said flow channel; The fixed plate divides the flow channel into a mounting cavity and a flow cavity; The fixing plate is provided with a mounting hole; One end of the metamaterial elastic connecting piece is fixed on the mounting cavity, and the other end of the metamaterial elastic connecting piece penetrates through the mounting hole to be connected with the spoiler in the flow cavity.
3. The wide-speed-domain adaptive architecture of a regenerative cooling channel of claim 1, wherein the flow channel is a heat exchange flow channel; In the flow channel, a side wall surface provided with the metamaterial elastic connecting piece is a first temperature area wall surface, and a wall surface opposite to the side wall surface is a second temperature area wall surface; The self-adaptive deformation of the spoiler adjusts the heat exchange intensity between the fluid and the first temperature zone wall surface and/or the second temperature zone wall surface.
4. A wide-speed-range adaptive structure for a regenerative cooling channel as set forth in any one of claims 1 to 3, wherein a plurality of said wide-speed-range adaptive structures are provided and are arranged at regular intervals along the flow direction of said flow path.
5. The wide-speed-domain adaptive architecture of a regenerative cooling channel of claim 4, further comprising a preload adjustment mechanism; The pretightening force adjusting mechanism comprises an adjusting wire body which sequentially passes through each fixing plate in the array and acts with each spoiler or a metamaterial elastic connecting piece connected with the spoiler; by pulling or loosening the adjusting wire body, the initial pretightening force of all the spoilers in the array and the acute included angle in the balance state can be synchronously changed.
6. A wide-speed-domain adaptive structure of a regenerative cooling channel as set forth in any one of claims 1 to 3, wherein the profile of the spoiler is adapted to the sectional shape of the wall surface of the flow chamber of the runner, and the periphery thereof is spaced from the wall surface of the flow chamber; One end of the spoiler, which is close to the wall surface of the second temperature zone, is a free end; And in an equilibrium state of the initial acute included angle, a preset distance is reserved between the free end of the spoiler and the wall surface of the second temperature region of the runner.
7. The wide-speed-domain adaptive structure of a regenerative cooling channel according to claim 5, wherein a predetermined distance is provided between the outside of the connecting end of the spoiler and the first temperature zone wall surface of the runner in the balanced state of the initial acute angle.
8. A wide-speed-domain adaptive structure of a regenerative cooling channel as set forth in any one of claims 1 to 3, wherein said acute included angle is 60 °.
9. A wide-speed-domain adaptive structure of a regenerative cooling channel as set forth in any one of claims 1-3, wherein said spoiler has a fluid-flushed face upstream toward the flow channel and a fluid-unwashed face downstream toward the flow channel; The fluid flushing surface is provided with a longitudinal texture array for increasing the effective flushing area of the fluid flushing surface.
10. A method of using the wide-speed-domain adaptive architecture of a regenerative cooling channel as defined in any one of claims 1-9, comprising the steps of: When fluid flows through the flow channel, the impact force generated by the change of the fluid flow on the spoiler is utilized to drive the spoiler to rotate around the connecting point of the spoiler, and the included angle between the spoiler and the wall surface of the flow channel is dynamically adjusted; Through the dynamic change of the included angle, the inclination angle is increased under the low flow condition to enhance heat exchange, and the inclination angle is reduced under the high flow condition to reduce flow resistance.

Description

Wide-speed-range self-adaptive structure and method for regenerative cooling channel Technical Field The invention belongs to the field of regenerative cooling channels, and particularly relates to a wide-speed-domain self-adaptive structure and method of a regenerative cooling channel. Background During high speed flight of an aircraft, the engine is continuously under extreme thermal load conditions, and various components are at risk of overtemperature. The regenerative cooling is a main technical approach for guaranteeing the thermal safety and the thermal environment stability of the engine at present, a plurality of groups of millimeter-scale rectangular channels which are connected in parallel are generally adopted, low-temperature fuel is used as a heat sink, and the cooling of the wall surface of the engine is realized in a convection heat exchange mode. However, the conventional rectangular channel has the problems of low heat exchange efficiency, high flow resistance, easiness in heat transfer deterioration and the like, and has become a prominent bottleneck for restricting further engineering application. In recent years, extensive researches are carried out around the structural optimization of the regenerative cooling channel at home and abroad, and focus is on drag reduction and heat transfer enhancement so as to improve the thermal protection stability of the aircraft in different flight speed areas. For example, some students adopt a topology optimization method to design a channel configuration, so that the pressure drop is reduced by 20.6%, the flow distribution uniformity under the working conditions of low flying speed and high flow is effectively improved, and the students introduce a three-period minimum curved surface (TPMS) lattice structure into a cooling channel, so that the cooling performance is improved by 46%, and the problem of insufficient heat exchange capacity under the conditions of high flying speed and low flow is remarkably solved. However, the fixed structure has limited regulation capability in the face of wide-range flow variation, and there is an inherent contradiction between flow heat transfer coupling, namely, the higher the flow velocity is, the greater the flow resistance is, and the lower the flow velocity is, the poorer the heat exchange performance is. This feature is contrary to the requirement of "high heat exchange at low flow rate and low flow resistance at high flow rate" in actual operation of the engine, and becomes a key technical bottleneck for restricting expansion of the engine operating speed range. Therefore, there is a need to develop a dynamic cooling structure with a self-adaptive channel structure in response to the change of the regenerative cooling flow, so as to realize the regenerative cooling function of reducing the flow resistance under the high-flow condition and enhancing the heat exchange efficiency under the low-flow condition, and provide a key technical support for the stable heat protection of the engine regenerative cooling system under the wide-speed-range working condition. Disclosure of Invention The invention aims to provide a wide-speed-domain self-adaptive structure and a method for a regenerative cooling channel. The inclination angle is automatically adjusted by the movable spoiler under the action of fluid, so that the wide-speed-range heat management of enhancing heat exchange at low flow and reducing resistance at high flow is realized. The invention provides a wide-speed-range self-adaptive structure of a regenerative cooling channel, which is arranged in an air or liquid flow passage and comprises the following components: spoiler, and A metamaterial elastic connection; one end of the spoiler is connected with a metamaterial elastic connecting piece, and the other end of the spoiler is fixed on the wall surface of the air flow channel; the metamaterial elastic connecting piece is configured to form an acute included angle with the wall surface of the runner in a balanced state; The spoiler is configured to reduce an included angle between the spoiler and the wall surface of the flow channel along with the increase of the flow rate of the fluid under the action of the fluid, so that the self-adaptive adjustment of enhancing heat exchange at low flow rate and reducing resistance at high flow rate is realized. Further, the device also comprises a fixing plate fixed on the wall surface of the flow channel; The fixed plate divides the flow channel into a mounting cavity and a flow cavity; The fixing plate is provided with a mounting hole; One end of the metamaterial elastic connecting piece is fixed on the mounting cavity, and the other end of the metamaterial elastic connecting piece penetrates through the mounting hole to be connected with the spoiler in the flow cavity. Further, the flow channel is a heat exchange flow channel; In the flow channel, a side wall surface provided with the metamaterial elastic connecti