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 flat DC channel to increase the heat exchange efficiency and the doubleinlet, 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 temperature 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.