基于转捩模型的涡轮流场及性能数值模拟  

Calculating Reynolds Number Effects on the Dynamic Performance of Turbine Based on Transition Model

作　　者：罗华玲[1] 乔渭阳[1] 许开富[1] 

机构地区：[1]西北工业大学动力与能源学院,陕西西安710072

出　　处：《西北工业大学学报》2007年第6期778-783,共6页Journal of Northwestern Polytechnical University

基　　金：国家自然科学基金(10377011)资助

摘　　要：基于耦合Langtry-Menter转捩模型的SST湍流模型，通过求解雷诺平均的N—S方程组对不同雷诺数工况下5台涡轮部件的性能及流场进行了全三维粘性定常计算。计算结果表明，所预测的5台涡轮效率及流通能力随雷诺数减小的变化量较俄罗斯经验关联曲线所给出的变化量偏低1～2个百分点左右。总的来说，建立的基于转捩模型的数值计算方法能够较好地评估雷诺数效应对涡轮性能的影响，具有较好的工程应用价值。To accurately predict the Reynolds number effects on the dynamic performance of turbine is key to the execution of successful design of highly-loaded low pressure turbine. After due discussion early in our paper, we conclude that Langtry and Menterrs paper, which takes into proper consideration the very important phenomenon of transition from laminar boundary layer to a turbulent one, can be used for calculating the Reynolds number effects on dynamic performance of five types of turbine, whose design parameters are listed in Table 1 in the full paper. In the full paper we explain the key results calculatea by applying Ref. 5＇s method; in this abstract, we just add some pertinent remarks to listing the three topics of explanation. The first topic is. calculation method. In this topic, we calculate the specific heat using eq. （1） in the full paper. The second topic is. verification of the numerical model with some experimental results. The third topic is： the analysis of the Reynolds number effects on the dynamic performance of a turbine. In this topic, we contrast the calculation results obtained from our numerical model with Russian experimental correlation, as shown in Figs. 7 and 8. The calculation results indicate preliminarily that the calculation method using our numerical model does have the ability to predict the effects of the Reynolds number on the dynamic performance of a turbine. The variation of both turbine efficiency and flow capacity with the decreasing of the Reynolds number is about 1%-2% smaller than those of Russian experimental correlation.

关 键 词：雷诺数效应 涡轮性能 转捩模型 数值模拟 

分 类 号：V211.24[航空宇航科学与技术—航空宇航推进理论与工程]