多孔平板相变发汗冷却耦合数值模拟  

Coupled Numerical Simulation of Transpiration Cooling With Phase Change in the Porous Plate

作　　者：潘明君 周强 黄哲庆[1] PAN Mingjun;ZHOU Qiang;HUANG Zheqing(School of chemical engineering and technology,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学化学工程与技术学院,西安710049

出　　处：《工程热物理学报》2024年第12期3863-3875,共13页Journal of Engineering Thermophysics

摘　　要：针对高超声速飞行器主动热防护问题,构建了耦合高超声速主流区和多孔介质区的松耦合数学模型。模拟了主流区马赫数6.47,以液态水为冷却介质的二维多孔平板相变发汗冷却。探索了注入率、多孔材料物性和烧结金属颗粒粒径对发汗冷却效果的影响规律。模拟结果表明:注入率从0.0159%提升到0.0795%,多孔平板表面平均冷却效率从0.41上升到0.87。烧结金属颗粒多孔平板的颗粒直径和孔隙率对发汗冷却效率影响较小。随着注入率增大,颗粒直径对发汗冷却效果影响逐渐变小,当注入率F=0.0795%时颗粒直径的变化已经不再影响冷却温度的分布;而随着注入率增大,孔隙率对发汗冷却效果的影响规律基本保持不变。相同注入率下不同材料多孔平板出口的平均冷却效率相当,但热导率越小的多孔平板前后端温差越大,且多孔平板进出口温差也越大,整个多孔区域的温度分布越不均匀。Transpiration cooling in two-dimensional porous plate under hypersonic flow has been numerically investigated.The numerical model considers the complex interaction between the hy-personic mainstream region and porous medium region.The simulations are performed at Mach number 6.47.The liquid water is adopted as the coolant.The effects of the injection rates,the par-ticle diameter,porosity and properties of porous material on transpiration cooling performance are analyzed.The simulation results show that the average cooling eficiency of porous plate increases from 0.41 to 0.87 when the injection rate varies from 0.0159%to 0.0795%.It also can be found that the effects of particle diameter and porosity of porous plate on transpiration cooling efficiency are marginal.The influence of particle diameter on transpiration cooling efficiency becomes weaker at higher injection rate.Such as,the temperature profles of porous plate for different particle diame-ters are almost the same when the injection rate is 0.0795%.Furthermore,the thermal conductivity of porous material has marginal effect on the averaged cooling efficiency of porous plate;however,the greater temperature difference between the two ends in the porous plate can be obtained at a smaller thermal conductivity.

关 键 词：高超声速 多孔平板 相变 发汗冷却 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]