考虑涡轮传热性能的气动设计耦合计算方法研究

A Conjugate Heat Transfer Analysis Procedure in Turbine Aerodynamic Design Considering Heat Transfer Performance

关键词:  涡轮  管网  气热耦合  优化  耦合计算

Key words:  Turbine  Pipe-network  Conjugate heat transfer  Optimization  Conjugate analysis

摘要:

为了在涡轮叶片气动型线设计过程中同时提高气动效率并保证传热性能，提出了一种基于一维管道网络法和三维CFD的耦合计算方法，分别采用管网/三维耦合计算方法和全三维耦合计算方法对MARK-II冷却叶片多个工况进行计算，两种数值计算方法计算结果与实验数据交叉对比，以验证本文计算方法可行性。计算结果表明，两种数值计算得到的叶片型面压力、温度、换热系数和实验值都比较吻合，但管网/三维耦合计算得到的壁面温度相比全三维耦合计算结果整体略微偏低，最大偏差不超过3.89%。基于管网/三维耦合计算方法对某航空发动机涡轮第二级动叶叶片型线优化设计，气动效率提高0.34%，壁面平均温度几乎没有变化。

Abstract:

A conjugate heat transfer (CHT) analysis procedure based on one-dimensional (1D)pipe-network method and three-dimensional (3D) computational fluid dynamics (CFD)solver is presented for the purpose of improving the aerodynamic efficiency and simultaneously ensuring heat transfer performance in the turbine blade aerodynamic design process. The pipe-network/3D procedure and full 3D CHT method are performed on the Mark-II cooled vane respectively under several working conditions. In order to verify the feasibility of the method mentioned in this study， the calculation result of the pipe-network/3D procedure is compared with that of the full 3D CHT method and the experimental data. As the results shown， the distribution of pressure， wall temperature and heat transfer coefficient obtained by both methods are in good agreement with the experimental data. Besides， although the wall temperature calculated by the procedure proposed in this paper is slightly lower than that of the full 3D CHT analysis， the maximum deviation is no more than 3.89%. The optimized design of a rotor blade profile from the second stage of an aero-engine is carried out by adopting the pipe-network/3D procedure. The aerodynamic efficiency is improved by 0. 34%， while the average wall temperature is almost not changed.