某机载S形深孔液冷板优化设计

S形深孔冷板被广泛应用在强迫液冷的机载电子设备中。从对常规S形深孔冷板的结构特点分析可知,因其流道串联、长且平直,所以流道内压力损失大,换热效率低。因此,在进行某机载S形深孔冷板优化设计时,采取了并联分支以降低流阻,在平直流道中设置了多级阶梯孔以提高换热效率,确定了冷板双进、双回以及双出的结构形式。经有限元仿真分析和试验验证,选取凸出物高度与当量直径比0.05进行阶梯孔优化,优化设计后的冷板流阻下降了1/3,最大温差下降了4.5℃。经装机使用,优化设计后的冷板散热性能可靠,达到了优化设计的目的,其优化方法对同类S形长直流道冷板的优化设计具有一定的参考价值。

Optimization Design of an Airborne S-shape Deep Hole Liquid Cooling Plate

S-shape deep hole cold plates are widely used in forced liquid cooling airborne avionics. From the structure analysis of conventional S-shape deep hole cold plate, its series connected and long straight flow channels will result in high pressure loss and low heat exchange efficiency. Therefore, in optimization design of an airborne S-shape deep hole cold plate, parallel branches are adopted to reduce the flow resistance, multistepped holes are set in the fiat DC channel to increase the heat exchange efficiency and the double-in- let, double-circuit and double-outlet structure of the cold plate are adopted. Finite element simulation and test verify that the ratio of the height and equivalent diameter of projection should be 0.05 to optimize the stepped hole. After optimization, the flow resistance of the cold plate decreases by 1/3, the maximum tem- perature difference falls by 4.5 ℃. The results of onboard application indicate that the optimized cold plate has good and reliable heat dispersion performance, which has achieved the goal of optimization design. The optimization method can provide some reference for optimum design of the similar S-shape long straight flow channel cold plate.