Numerical simulation of broken pin effects on the flow field and cooling performance of a double-wall cooling configuration

• 来源期刊: 中国航空学报（英文版）
• 年，卷（期）: 2021,（2）
• 页码范围: 358-375
• 页数: 18页
• 语种: 英文

摘要

In this paper, the flow characteristics of the double wall structure are presented and the effect of the broken pin size on the cooling performance and flow field of the double wall configu-ration is investigated. A periodic plate model with seven units is adopted, and there are an impinge-ment hole and a film hole in each unit. Under five blowing ratios, six different sizes of the broken pin are compared, and the double wall configuration without broken pins is taken as the baseline. The results show that if the broken pins height is too small, the cooling effectiveness usually cannot be improved. With the presence of broken pins with a height of more than 0.4, the effectiveness is improved due to the enhancement of reattachment and recirculation of coolant. With the increase of the broken pin height, the cooling effectiveness increases. However, the increase of the diameter does not always improve the cooling performance, since the limiting effect of the wall jet. In this study, Case 6 with the largest broken pin always has the best cooling performance, but also the lar-gest flow resistance. In Case 6 temperature is reduced by almost 15 K compared to the baseline, and more areas have relatively higher cooling effectiveness.