500 / 2018-12-31 15:37:35

Numerical Research on Optimization of Meridional Channel of a Mechanical-Driven Steam Turbine 某驱动式汽轮机子午流道优化数值研究

Mechanical-Driven Steam Turbine 驱动式汽轮机;Meridional Channel 子午流道;Numerical Simulation 数值仿真

全体主题 > 涡轮机

汽轮机热力设计通常只考虑了叶高节径等参数，未能充分考虑子午流道变化对汽轮机性能的影响。采用有限体积法求解三维雷诺时均N-S方程，对某驱动式汽轮机进行流体仿真计算。在热力设计给定的叶高节径等参数下，建立了压力级通流计算模型，对比了动静叶端部子午流道变化对汽轮机气动和热力性能的影响。结果表明，子午流道的变化，对汽轮机叶片气动性能有着显著的影响。合理设计的子午流道，可有效抵制叶片端部二次流，减少气动损失。根据对比结果和优化算法，对目标机组子午流道进行了优化，提高了机组气动和热力性能。
Steam turbine thermal design usually only considers parameters such as height and diameter of the blade, and fails to fully consider the influence of the meridional channel change on the performance of the turbine. The finite volume method is used to solve the three-dimensional Reynolds averaged N-S equation, and the fluid simulation calculation is performed on a mechanical-driven steam turbine. Under the parameters of the blade height and diameter given by the thermal design, the pressure stage flow calculation model is established, and the influence of the meridional channel change on the aerodynamic and thermal performance of the turbine is compared. The results show that the variation of the meridional channel has a significant impact on the aerodynamic performance of the turbine blades. The rational design of the meridional flow channel can effectively resist the secondary flow at the end of the blade and reduce the aerodynamic loss. According to the comparison results and optimization algorithm, the target unit meridional channel is optimized to improve the aerodynamic and thermal performance of the steam turbine.