基于流体仿真的大功率水负载结构及散热优化

Structure and heat dissipation optimization of high power water load based on fluid simulation

利用水的高比热容和可循环冷却特性,大功率水负载可有效保证输出功率得到稳定吸收,从而保证器件的可靠性。根据输出功率的大小,利用流体仿真软件Fluent对水负载入水口流速大小、腔体内外部结构以及出入水口直径进行优化设计。仿真优化表明,提高流速会降低吸收腔内的温度,但其温度改变不大,在热边界条件下合适的流速为V=8 m/s;结构优化表明,水负载最优的散热结构为,入水口与上外壳边缘相切,出水口圆心与顶面圆圆心重合;单独增大出水口直径,不利于散热,需要同时增大出入水口直径,才能达到促进散热的效果。

Based on the high specific heat capacity and cyclic cooling characteristics, high power water load can absorb the output power sustainably and stably, ensuring the device reliability. The velocity of input pipeline, the internal and external structure of enclosure, the diameter of input and output ports, were optimized by Fluent software based on export power. The results show that the temperature of absorption enclosure decreases when the input velocity increase, and the most suitable velocity for the thermal boundary condition is V=8 m/s. The structure optimization shows that the best heat dissipation structure of water load is that, the water inlet pipe is tangent to the edge of the upper shell, meanwhile, the center of output pipe is coincide with top of the center of the circle on the upper shell. Besides, it’s not favorable to dissipate heat when increasing the diameter of output pipe solely, in order to promote the heat dissipation of absorption enclosure needs to increase the input and output diameter of pipe at the same time.