透平进气阀箱的数值模拟

用数值方法模拟了透平进气阀箱的内部流动。为了改善计算的收敛性和提高计算精度，程序采用了ＳＩＭＰＬＥＳＴ迭代求解方法，并引入ｋ－ε湍流模型、壁面函数法和空度的概念进行了数值计算。计算结果表明，本文的方法能够较好的模拟进气阀箱内部复杂的流动，并与已有的一些实验结果吻合良好。

NUMERICAL FLOW SIMULATION OF INLET VALVE BOX OF TURBINE

A computational fluid dyanmics code is used to simulate the flow in a test inlet valve box of turbine.The work sets two major goals:to acquire a comprehensive understanding of the complex three-dimensional flowfields in the valve box at representative operating conditions and to find out an effective tool to optimize performance at the given operating conditions.In order to improve the convergence and precision of the calculation,the numerical algorithm employs Body-fitted Coordinate (BDC) grids,the SIMPLEST method,the standard k-ε turbulence model,wall function method and the porosity method.In the results,the calculated flow pattern in the valve box and the loss coefficients of the valves appeared are in an improved agreement with the measured data.The tested values of the total pressure diverge from the numerical results,but their trends are about the same.