R134a喷射冲击相变制冷的数值模拟及结构优化

发布时间：2018-07-06 14:57

本文选题：喷射冲击 + 相变制冷　；参考：《低温与超导》2017年03期

【摘要】：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。
[Abstract]:In order to analyze the heat transfer effect of R134a jet shock phase change refrigeration, based on numerical simulation, the effect of various physical factors on cooling effect was studied by using the idea of computational fluid dynamics and the method of controlling variables. The flow channel length L is constant. The analysis variables are as follows: flow channel height C, nozzle width W, throat width D 1, jet outlet width D 2, nozzle height H, volume fraction ratio of liquid phase to gas phase 蠅. The results show that the cooling effect of hot surface decreases with the increase of channel height and nozzle width, and increases with the increase of volume fraction of liquid phase to gas phase. The cooling effect increases with the decrease of throat width and nozzle height near the stagnation point, and increases with the increase of throat width and nozzle height near the outlet of the channel. At the hysteresis point, the best cooling effect model is as follows:% C / L = 0.02nW / L = 0.05g / L = 0.05g / L = 0.01g / L = 0.01g / L = 0.015g / L = 0.015 / h / L = 0.03.
【作者单位】：太原理工大学环境科学与工程学院;

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