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为分析R134a喷射冲击相变制冷的传热效果,以数值模拟为基础,采用计算流体力学的思路,通过控制变量的方法,研究各个物理因素对冷却效果的影响。流道长度L为定值,分析变量为流道高度C,喷嘴宽度W,喉部宽度D1,喷射出口宽度D2,喷嘴高度H,液相与气相的体积分数比ω。结果表明:热表面的冷却效果随流道高度和喷嘴宽度的增大而减小,随液相与气相的体积分数比ω的增大而增大;而在止滞点附近的冷却效果随喉部宽度和喷嘴高度的减小而增大,在流道出口附近随喉部宽度和喷嘴高度的增大而增大。在止滞点处,冷却效果最佳的结构模型为:C/L为0.02,W/L为0.05,D1/L为0.01,D2/L为0.015,H/L为0.03。
In order to analyze the heat transfer effect of R134a jet impact phase change refrigeration, based on the numerical simulation, the influence of each physical factor on the cooling effect was studied by means of controlling variables by using the method of CFD. The length of the runner L is a constant value, and the analysis variables are the runner height C, the nozzle width W, the throat width D1, the ejection outlet width D2, the nozzle height H, and the volume fraction ratio of the liquid phase to the gas phase ω. The results show that the cooling effect of the hot surface decreases with the increase of the height of the flow channel and the width of the nozzle, and increases with the increase of the volume fraction of the liquid phase and the gas phase. The cooling effect near the point of stagnation The width of the section and the height of the nozzle increase and increase with the increase of throat width and nozzle height near the exit of the flow channel. At the point of stagnation, the best cooling model was C / L 0.02, W / L 0.05, D1 / L 0.01, D2 / L 0.015 and H / L 0.03.