热力发电2017，Vol.46Issue(9)：59-64,6.DOI:10.3969/j.issn.1002-3364.2017.09.059
壁厚对气膜冷却效率影响数值模拟
Effect of wall thickness on film cooling effectiveness: numerical simulation
摘要
Abstract
To explore the influence of thin wall size on film cooling performance, numerical simulation was carried out to investigate the flow field, temperature field and cooling effectiveness under conditions with wall thickness of one time, two times and three times of diameter of the film-cooling hole. The results show that, high-speed region appears at the hole exit with the wall thickness of one time of the hole diameter, resulting in an increase in the jet momentum and promoting the coolant being lifted off the wall. The lateral velocity of the coolant is towards to the center line of the hole, which weakens the spanwise diffusion. Compared with the wall thickness of three times of the hole diameter, the values of spanwise averaged film cooling effectiveness for one times of the hole diameter are about 9%~45%, 21%~43% and 9%~62% lower at blowing ratios of 1.0, 1.5 and 2.0, respectively. There is little difference in spanwise averaged film cooling effectiveness between the wall thickness of two times and three times of the hole diameter.关键词
气膜冷却/冷却效率/薄壁/长径比/吹风比/壁厚/扩散性/数值模拟Key words
film cooling/cooling efficiency/thin wall/ratio of length to diameter/blowing ratio/wall thickness/diffusivity/numerical simulation分类
能源科技引用本文复制引用
李广超,彭宁建,张魏,寇志海,毛晓东,张国臣..壁厚对气膜冷却效率影响数值模拟[J].热力发电,2017,46(9):59-64,6.基金项目
国家自然科学基金(51406124) （51406124）
辽宁省自然科学基金(201602576)National Natural Science Foundation of China (51406124) （201602576）
Natural Science Foundation of Liaoning Province (201602576) （201602576）
