阵列射流冲击冷却传热特性的数值研究

以涡轮叶片冷却技术为背景,采用带转捩的剪切应力输运(Transition SST)模型对阵列射流冲击冷却的传热特性进行数值模拟,分析了冲击Re、冲击间距、初始横向流和冲击孔排列方式的影响规律。结果表明:冲击间距对靶面平均Nu的影响存在最优值,在所计算的范围内,Zn/d=2时平均Nu最大;在冲击孔排列方式影响中,当冲击间距Zn/d≤2时,顺排孔冲击冷却传热效果优于错排,而当Zn/d≥3时,错排孔冷却传热效果优于顺排。

Numerical investigation on heat transfer characteristics of jet array impingement cooling

Numerical computation with Transition SST model was conducted to investigate the heat transfer characteristics for the jet array impingement cooling.The effects of the jet Reynolds number,the jet-to-surface spacing,the initial cross-flow and the impinging holes arrangement on heat transfer characteristic were investigated.Results show that there exists a optimal jet-to-surface spacing of heat transfer,the Nusselt number could reach the highest value when Zn/d=2;the effect of heat transfer of inline arrangement is better than staggered arrangement when Zn/d≤2,as the staggered arrangement is better than inline arrangement when Zn/d≥3.