燃气轮机涡轮叶片气场耦合仿真研究

采用有限差分方法开发了气冷涡轮气弹耦合求解器。该求解器分别在流动区域求解时间平均N-S方程，在固体区域求解振动方程，在流固边界则施加了气弹耦合边界条件。在流动问题求解中，采用了B-L代数湍流模型封闭时均N-S方程，采用三阶AUSMPW 差分格式离散对流项，并采用隐式LU-SGS格式求解离散后的代数方程；振动问题则采用显式格式求解；采用代数网格法进行固体区域动态网格生成。采用该耦合求解器对某涡轮级动叶的振动响应问题进行了数值仿真，研究表明：所开发的耦合求解器能够用于振动响应问题的分析，同时本算例中涡轮动叶的振动不存在发散现象，并且叶片振动对流动的影响很小

Flow-structure coupling simulation of the turbine stage in a gas turbine

The flow-structure coupling problem of a turbine stage is numerically studied. Numerical simulations are carried out with a developed FDM (finite difference method) flow-structure coupling solver. The 3D RANS (Reynolds Averaged Navier-Stokes) equations and the B-L (Baldwin-Lomax) turbulence model are solved in the fluid zone, while the vibration equation is solved in the solid zone. The boundary conditions are transferred between the two zones after each time step. The LU-SGS scheme and 3rd order MUSCL AUSMPW difference scheme are applied to calculate the unsteady flow problem in the turbine. And an explicit difference scheme is applied to solve the structure model. Such solver is utilized to analyze the flow-induced vibration problem of the rotor in the blade stage. The results show that the developed coupling solver could be used to analyze the flow-induce vibration problem, and that there is no oscillation divergence in the turbine rotor.