【作者】 孟通； 朱惠人； 郭涛； 郑杰；

【Author】 MENG Tong;GUO Tao;ZHENG Jie;

【机构】 西北工业大学动力与能源学院；

【摘要】 运用数值模拟的方法对微小尺度不同受限冲击冷却结构的换热特性进行了研究,得出不同克努森数、冲击孔径、孔间距、冲击距的影响规律。结果表明:在计算雷诺数范围内,流量系数随克努森数的增大而增加,冲击靶面平均对流换热系数受克努森数影响不大,但局部分布有差异。冲击射流孔径越小,椭圆形驻点区域内换热越强,冲击靶面平均对流换热系数越大。孔间距越小,冲击靶面换热越强。在本文所计算的小射流冲击距范围内,变化冲击距对换热影响不明显。更多还原

【Abstract】 A numerical study was performed to simulate the heat transfer characteristics of microscale confined impingement cooling structures and draw conclusions of the influence of different Knudsen numbers,jet nozzle diameters,hole spacing and impingement distances in heat transfer.The results show that:within the range of Reynold number that calculated,the discharge coefficient increase as Knudsen numbers grow,the average convective heat transfer coefficient of target surface have no evident relationship with Knudsen number but there is some difference of local distribution.The average convective heat transfer coefficient of target surface increases when the jet nozzle diameters become smaller,so does the heat transfer situation in oval stagnation region on the target surface.Heat transfer on the target surface gets stronger when the hole spacing decrease.With small impingement distances calculated in this paper,there are no evident effects on heat transfer coefficient when the impingement distance is changed.更多还原