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

作　　者：Wenjing GAO Honglin LI Lei LI Zhe’nan ZHAO Zhufeng YUE 

机构地区：[1]Department of Engineering Mechanics,Northwestern Poly technical University,Xian 710129,China

出　　处：《Chinese Journal of Aeronautics》2021年第2期358-375,共18页中国航空学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 51975471);Aviation Power Foundation of China (No. 6141B090319);Natural Science Basic Research Plan in Shaanxi Province of China (No.2018JM5173);National Natural Science Foundation of China(No. 51975471);National Science and Technology Major Project (2017-VIII-0003-0114);Natural Science Foundation of Shaanxi Province (No. 2018JQ5041)。

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 configuration is investigated. A periodic plate model with seven units is adopted, and there are an impingement 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 largest flow resistance. In Case 6 temperature is reduced by almost 15 K compared to the baseline, and more areas have relatively higher cooling effectiveness.

关 键 词：Broken pin Computational Fluid Dynamics Cooling performance Double wall configuration Turbine blades 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程]