大功率速调管收集极高效强迫风冷散热系统的设计

Design of high efficiency forced air cooling heat dissipation system for collector of high-power klystron

为解决大功率小型化速调管收集极在强迫风冷条件下的高效散热问题,以某大功率速调管为研究对象,介绍了一种大功率高效风冷收集极系统的设计方法。利用ANSYS有限元软件对收集极的强迫风冷散热特性进行模拟计算,分析比较了非均匀热流密度加载方式下不同散热翼片结构对风冷收集极的风阻和最高温度的影响,确定了散热翼片的尺寸和数量。为进一步提高风冷收集极系统的对流换热效果,对收集极入风口的结构进行改进,收集极内表面最高温度降低了22℃。采用风冷收集极风阻的计算模型对风阻进行验证,仿真结果与理论值相差2.2%。最后对采用该风冷收集极系统的大功率速调管进行测试,实验测试的最高温度与仿真结果相差1.8%,验证了该风冷收集极系统设计的合理性和有效性。

To solve the problem of efficient heat dissipation of high-power miniaturized klystron collector under forced air cooling condition,this paper takes a high-power klystron as the research object,and introduces a design method of high-power and efficient air cooling collector system.ANSYS finite element software is used to simulate and calculate the forced air cooling heat dissipation characteristics of the collector.The effects of different cooling fin structures on the wind resistance and maximum temperature of the collector under non-uniform heat flux loading are analyzed and compared.The size and number of cooling fins are determined.To further improve the convective heat transfer effect of the air cooling collector system,the structure of the inlet of the collector is improved and the maximum temperature of the inner surface of the collector is reduced by 22℃.The calculation model of the wind resistance of the air cooling collector is used to verify the wind resistance.The difference between the simulation results and the theoretical value is 2.2%.Finally,the high-power klystron with the air cooling collector system is tested.The maximum temperature difference between the experimental and simulation results is 1.8%,which verifies the rationality and effectiveness of the design of the air cooling collector system.