带扰流柱阵的双层壁间隙冲击传热特性

数值模拟研究了带扰流柱阵的双层壁结构间隙靶面、冲击面以及不同位置扰流柱面努塞尔数详细分布，分析了各个表面努塞尔数平均值随冲击雷诺数的变化规律以及不同位置扰流柱面换热特性差别。结果表明，靶面努赛尔数的第二峰值大于滞止点处的努赛尔数。冲击面展向平均努赛尔数最大值位于靠近冲击孔的第2排和第4排扰流柱处。在5排扰流柱中，与冲击孔处于同一排(第3排)的扰流柱面平均努塞尔数最大，表现为翻卷汇流传热特性；第2排和第4排扰流柱面平均努塞尔数次之，表现为翻卷绕流传热特性。远离冲击孔的第1排和第5排扰流柱面平均努塞尔数最小，表现为绕流传热特性。冲击雷诺数从1×10⁴增加到6×10⁴,第3排扰流柱面和第2、4排扰流柱面以及第1、5排扰流柱面努塞尔数增幅分别为306%、325%和360%。

Impinging Heat Transfer Performance Inside Double-wall Structure with Pin-fin Array

Numerical simulation was carried out to study the heat transfer characteristics of the double-wall structures with pin-fin array. The Nusselt number distributions and the averaged values on the target surface, impingement surface and pin-fin surfaces at the different locations were analyzed at impingement Reynolds number ranging from 1.0×104 to 6.0×104. The second peak of the Nusselt number distribution appears on the target surface, where the Nusselt number is greater than that on the stagnation point. The maximum spanwise averaged Nusselt numbers on the impingement surface were found at the positions of the second row and the fourth row of pin-fins next to the impingement holes. The heat transfer characteristics on the pin-fins at different rows are different. The Nusselt number on the pin-pin in the same row to the impingement hole is the largest, showing the heat transfer characteristics of the fountain flow. The Nusselt number on the second row and the fourth row of the pin-fins are second, showing the heat transfer characteristics of rolling flow around pin-fin. The Nusselt number of the first row and the fifth row of pin-fins far away from the impingement hole is the smallest, showing the heat transfer characteristic of flow across pin-fin. With the Reynolds number varying from 1.0×104 to 6.0×104, the surface averaged Nusselt numbers of the third pin-fin row, the second and the fourth, and the first and the fifth row increase by 306%, 325% and 360%, respectively.