典型层板冷却结构中流体流阻与换热特性的实验

对进气孔、扰流柱和出气孔个数之比为1∶4∶1的典型层板冷却结构的流体流阻与换热特性进行了实验研究.结果表明,对于进、出气板间距不大的层板模型,出气板内表面的换热系数最大,扰流柱表面的换热系数次之,进气板内表面的换热系数最小.对不同层板模型的比较表明,相同流量下随着进气孔直径的增大,流阻系数增大,进气板内表面的换热系数变化不大、出气板内表面的换热减弱;随着出气孔直径的增大,流阻明显减小,进气板内表面的换热减弱,出气板内表面的换热变化不大;随着出气孔倾角的增大,流阻增大,进气板内表面的换热增强,出气板内表面的换热变化不大.

Experimental investigation of flow resistance and heat transfer characteristics of typical lamilloy models

Experimental investigation of flow resistance and heat transfer characteristics has been carried out on a typical lamilloy model whose ratio of inlet hole,pin-fin,and outlet hole is 1:4:1.The results show that for a lamilloy model,the heat transfer coefficient of the internal surface of outlet board is the highest,followed by the pin-fin's surface,and that of the internal surface of inlet board is the lowest.The comparisons show that at the same mass flow,the flow resistance increases,the heat transfer coefficient of the outlet board decreases,and the heat transfer coefficient of the intlet board changes little by enlarging the inlet hole.Comparisons also show that the flow resistance and the heat transfer coefficient of the inlet board increase,but the heat transfer coefficient of the outlet board has little change by reducing the outlet hole or increasing the obliquity of the outlet hole.