摘要
以涡轮导叶为研究对象,采用压力敏感漆(PSP)实验测量的方式,在保证开孔率一致的前提下,设定密度比(DR)为1.4和3.0,模拟飞机在低空和高空飞行时的发动机温比,系统研究了不同质量流率(MFR)下孔径扩大对前缘气膜冷却效率的影响。结果表明:在DR=1.4和3.0条件下,扩大孔径均导致前缘面平均冷却效率下降,但吸力面与压力面的规律呈现显著差异;在两种密度比下,吸力面面平均冷却效率随孔径增大呈先降后升趋势,即在DR=1.4时,降幅为6%,增幅为3%,在DR=3.0时,降幅为17%,增幅为4%;在DR=1.4时,压力面面平均气膜冷却效率随孔径增大持续降低,降幅为13%~16%,而在DR=3.0时表现为先升后降,增幅和降幅分别为10%和11%。
Taking the turbine guide vanes as research object,on premise of fixed porosity,the density ratio(DR)was set to 1.4 and 3.0 to simulate the engine temperature ratios during low and high altitude flight of an aircraft,and the effect of hole diameter enlargement on the leading-edge film cooling effectiveness at different mass flow rates(MFR)was studied systematically through pressure-sensitive paint(PSP)experiments.The results show that under the conditions of DR of 1.4 and 3.0,increased hole diameters consistently reduce the leading-edge area-averaged cooling effectiveness,but there is a significant difference between the suction surface and the pressure surface.At both density ratios,area-averaged cooling effectiveness of suction surface shows a trend of first decreasing and then increasing with hole diameter enlargement(i.e.a decrease of 6%and an increase of 3%at DR of 1.4;a decrease of 17%and an increase of 4%at DR of 3.0).The pressure surface demonstrates divergent trends,the cooling efficiency continues to decrease by 13%to 16%with the increase of hole diameter at DR of 1.4,while the cooling efficiency shows a trend of first increasing and then decreasing at DR of 3.0,i.e.an increase of 10%and a decrease of 11%.
作者
时楚翔
叶林
佘红旭
王新羽
刘存良
SHI Chuxiang;YE Lin;SHE Hongxu;WANG Xinyu;LIU Cunliang(School of Power and Energy,Northwestern Polytechnical University,Xi'an,China,710129;Science and Technology on Altitude Simulation Laboratory,Mianyang,China,621000)
出处
《热能动力工程》
北大核心
2025年第11期1-10,共10页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金(52406056,U2241268)
中国航发四川燃气涡轮研究院外委课题(STH-2023-0002)。
关键词
涡轮叶片
气膜冷效
孔径
密度比
实验测量
turbine vane
film cooling effectiveness
hole diameter
density ratio
experimental measurement
