【作者】 赵晓军；

【导师】 余莉；

【作者基本信息】 南京航空航天大学 ， 人机与环境工程， 2008， 硕士

【摘要】 机载电子设备的热流密度随着电子技术和航空工业的快速发展而急速增加,传统的风冷冷却技术需要加大发动机的引气量,从而影响发动机的性能。基于热管技术在地面电子设备冷却中的广泛应用,热管冷却技术成为机载电子设备冷却的一种新思路,而机载设备因飞行器的机动性能,尤其是战斗机的机动性能很强,在飞机快速加速、减速或旋转时必然产生动载,动载对热管传热会有什么样的影响,目前尚缺乏这方面的研究。本文首先对热管的传热原理和发展技术进行了综述,探讨了电子设备冷却技术的发展状况。在此基础上,采用理论分析和数值模拟的方法,选用对轴向热管传热性能影响最大的轴向加速度为动载状态,利用Fluent商用软件对热管在动载状态下的传热过程进行了定量研究。着重分析了热管在不同动载状态下传热量变化;热管管壁温度分布及径向流阻变化情况等,得出了动载会造成热管壁面温差增加,降低热管的传热性能,但不同方向的动载对传热性能的影响是不一致的。数值结果也定量地显示了蒸汽腔压力随流向降低,但在蒸汽出口略有回升的物理现象,液相的流阻结果反映了液体轴向流量增大,流阻系数将会增加。最后对本文的研究工作进行了总结。本文研究结果可为热管在机载电子设备冷却中的应用提供了参考。更多还原

【Abstract】 With the rapid development of electronic technology industry and aviation industry, the heat flux of airborne electronic equipment increase rapidly. But the traditional forced-air cooling technical enlarge air content from the engine, which can affect the engine the performance. As the heat pipe cooling technology has been used widely in the ground electronics facility, the heat pipe cooling technology becomes one new kind of airborne electronics cooling. But the board installation because of the flight vehicle maneuvering performance, especially the fighter aircraft maneuvering performance very is in particular strong, when airplane fast acceleration, deceleration or revolving has a dynamic load inevitably, this dynamic load will certainly to affect in all board installations. The dynamic load condition could have any type influence to the heat pipe heat transfer, at present still lacked this aspect the research.This paper first summary the principle and development of technologies of heat pipe, study on electronic equipment cooling technology development. On this basis, using the theoretical analysis and numerical simulation method, selecting of axial heat pipe heat transfer performance of the most axial acceleration as dynamic load conditions, using the commercial software Fluent in the heat pipe under dynamic load of the heat transfer process quantitative study. Emphasis on heat pipe under different dynamic load conditions change heat transfer; heat pipe wall temperature distribution and radial flow resistance changes, and so on, find that dynamic load will cause the wall surface temperature increase, reduce the heat transfer performance of heat pipe, but under different directions dynamic load on the performance of heat transfer is inconsistent. The numerical results also quantificationally show that the pressure of steam chamber decreased with flow, but a slight recovery in the export steam physical phenomenon; the liquid flow resistance results of the liquid reflect increased axial flow, flow resistance coefficient will increase. Finally, this study was summarized. The results of this study can be in the heat pipe cooling avionics equipment in the application of the reference.更多还原