气膜抽吸作用下透平叶片冲击冷却的一维管网计算方法研究  

Research on One-Dimensional Flow Network Calculation Method for Impingement Cooling of Turbine Blades under Suction Effect of Air Film

作　　者：包林焌 刘钊 张韦馨 丰镇平[1] BAO Linjun;LIU Zhao;ZHANG Weixin;FENG Zhenping(School of Energy&Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2024年第11期65-77,共13页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(52076168)。

摘　　要：为了研究透平叶片冲击冷却结构的一维管网计算方法,利用Python自主编制了一维管网程序。分别选取平板冲击冷却、有无靶面气膜抽吸的前缘冲击冷却模型为研究对象,通过分析冲击冷却的内部流动换热特性,提出了局部阻力修正方法,并考虑了气膜抽吸的作用,提出了靶面气膜抽吸的前缘冲击冷却的换热修正方法。将管网计算结果分别与实验数据以及经湍流模型验证和网格无关性考核后的三维计算流体动力学(CFD)计算结果进行对比,对所编制的一维管网程序进行了验证。结果表明:所编制的一维管网程序在计算平板冲击冷却时计算精度较高,计算结果与实验数据吻合较好,相对误差不超过12.4%。对于前缘冲击冷却,经局部阻力修正后的一维管网程序流动计算结果误差较小,与三维CFD计算结果基本一致。由于气膜抽吸的作用,靶面气膜抽吸的前缘冲击冷却的计算精度有待进一步改进。综合考虑了气膜孔结构参数以及气膜孔出流比的影响后,提出了换热修正因子,并设计了管网模型的修正方案,经修正后靶面气膜抽吸的前缘冲击冷却的管网计算精度显著提高,相对误差基本在10%左右。To explore the one-dimensional network calculation method for impingement cooling of turbine blades,an independent one-dimensional network program is developed using Python.The research focuses on impingement cooling models for flat plate cooling and leading edge impingement cooling with or without target surface air film suction.Through an analysis of the internal flow and heat transfer characteristics of impingement cooling,a local resistance correction method is introduced.Considering the impact of air film suction,a heat transfer correction approach for leading edge impingement cooling with target surface air film suction is proposed.The results of the network calculations are compared with experimental data and three-dimensional CFD results that are verified through turbulence model validation and grid independence assessments,confirming the accuracy of the one-dimensional network program.The findings reveal that the one-dimensional network program demonstrates high precision in calculating plate impingement cooling,showing close agreement with experimental data and a relative error not exceeding 12.4%.In the case of leading edge impingement cooling,the flow calculation results of the one-dimensional network program,following local resistance correction,exhibit minor errors but are overall consistent with the outcomes of three-dimensional CFD calculations.Given the influence of air film suction,it is necessary to further enhance the calculation accuracy of leading edge impingement cooling with target surface air film suction.After considering the effects of air film pore structural parameters and air film pore outflow ratio,a heat transfer correction factor is proposed,and a correction scheme for the network model is devised.Post-correction,the calculation accuracy of leading edge impingement cooling with target surface air film suction is notably improved,with a relative error of approximately 10%.

关 键 词：冲击冷却 管网计算 气膜抽吸 修正方法 

分 类 号：TK474.7[动力工程及工程热物理—动力机械及工程]