摘要
应用热流耦合计算和热风洞叶栅实验的方法,研究了燃气透平某亚音速叶型的气冷传热特性。实验叶片模化比为1.87,测量了冷气流量对冷却效率的影响,并基于一维传热计算模型,分析了实验测量结果的可靠性。通过对该模型叶片热流耦合的模拟,所得结果与实验结果的比较表明:是否准确地模拟叶片外表面燃气流动状态,是能否准确预测叶片表面温度和冷却效率的关键。带有γ-θ转捩的SST模型能较好的预测叶片前缘至中弦区域的传热过程,热流耦合计算结果与实验基本一致。本文工作为后续深入研究和评估燃气透平叶片内冷结构设计的效果,提供了的数值计算方法与实验基础。
In this paper , a method of thermal-flow coupled calculation and thermal wind tunnel cascades experiments was used to study the air-cooled heat transfer characteristics of a certain type of subsonic gas turbine airfoil .The mold ratio of the experimental vane is 1.87.Experimentally , we measured the effects of cooling air flow rate on cooling effectiveness and analyzed the reliability of the experi -mental results by means of one-dimensional heat transfer model .By simulating thermal-flow coupled heat transfer of the model vane , the comparison with experimental results shows that：accurate simulation of the gas flow state on the outer surface of vane is the key to accurately predict the vane surface temperature and cooling effectiveness .The SST model with γ-θtransition can better predict the heat transfer process from the leading edge to the middle string , and the results of thermal-flow coupled calculation are basically the same with the experimental results .The work of this paper provides a numerical method and experimental foundation to the following thorough research and evaluation of design effects on the cooling structure of gas turbine vane .
出处
《燃气轮机技术》
2014年第3期26-31,共6页
Gas Turbine Technology
基金
国家自然科学基金资助项目(51276116)
关键词
燃气轮机导叶
热流耦合计算
热风洞叶栅
冷却效率
换热系数
gas turbine vane
thermal-flow coupled calculation
thermal wind tunnel cascades
cooling effectiveness
heat transfer coefficient
