摘要
为了更进一步研究真实发动机尺寸下冲击通道的流动与换热情况,针对冲击孔与气膜孔组合形式的受限冲击通道,在保证与真实发动机工况相等的克努森数,通过实验研究与数值模拟研究,进一步解释了不同结构微小冲击通道的整体换热情况,结果表明,在相同的雷诺数下,冲击射流孔径越小,冲击靶面驻点区域内换热越强,冲击平均对流换热系数越大。孔间距越小,冲击靶面平均对流换热系数越大,并且随着射流冲击距的增大,换热减弱。
In order to investigate the flow and heat transfer characteristics of inner cooling chan-nel with real engine sizes.This paper mainly to in-vestigate the heat transfer characteristics of micro scale confined impingement cooling structures. Knudsen number is equal to the Knudsen number in real working condition of engine.The thermody-namic characteristics of micro scale impingement channels with different geometry are studied by ex-periment and numerical simulation.The results show that with the same Reynolds number,average heat transfer coefficient of channel increases as the holes diameter decreases,and it decreases as the magnitude of impingement distance or hole spacing increases.
出处
《机械与电子》
2014年第8期22-25,51,共5页
Machinery & Electronics
关键词
冲击冷却
微尺度
数值模拟
换热系数
雷诺数
impingement cooling micro scale numerical simulation heat transfer coefficients Reynolds
