狭缝间距变化对冲击-多斜孔壁换热特性影响的数值与试验研究

数值研究了冲击-多斜孔壁复合冷却方式中,狭缝间距在1D* ~4D*(D*为当量直径)范围内变化时对换热特性的影响,并通过试验研究证明了数值模拟结果的正确性.研究发现,狭缝间距变化,使得冲击射流的发展以及狭缝内的气流抽吸、涡旋的形成受到不同程度的影响,换热效果随着间距的增大先增大后减小.研究还发现,流体微团在狭缝中的流动以平动形式为主,在多斜孔和冲击孔孔内以及邻近区域表现为明显的转动特征.微团转动的增强提高了换热效果. 

Numerical and experimental investigation on effect of distance between impingement and effusion plates on heat transfer characteristics of impingement-effusion composite cooling

The influence of distance between impingement and effusion plates on heat transfer characteristics of impingement-effusion double wall was investigated numerically,and the validity was experimentally verified.Results show that,with the increase of gap distance,heat transfer characteristics increase firstly,and then decrease.The change of gap distance caused different developments of impinging jet and pumping effects,and also led to different heat transfer effects.It shows that fluid particles move in transl...