Computational Fluid Dynamics Analysis Approach to the Aerodynamic Performance of a Nozzle Controlling Stage for a 600MW Steam Turbine
The aerodynamic performance of a nozzle controlling stage contributes significantly to overall efficiency of a large power steam turbine. The partial arc admission flow condition results in the non-axisymmetric inlet flow condition for the nozzle controlling stage. The commercial CFD software NUMECA is utilized to solve the RANS for investigating the flow fields of the nozzle controlling stage. The multi-block structural grid is used to generate the computational grid. The finite volume method is applied to discretize the RANS equations. The Baldwin-Lomax turbulence model is used. Three flow conditions of the four valves opening, three valves opening and two valves opening of the nozzle controlling stage were conducted with thinking of the non-axisymmetric inlet boundary condition according to the partial arc admission. The numerical results show that the efficiency decreases according to the part arc admission for four valves opening condition. As to the three valves opening and two valves opening cases, the efficiency decreases in further according to the larger part admission. In addition, the flow rate of the nozzle controlling stage increase with the outlet pressure decreases and so does output power. The present work provides the theoretical basis and technical support to improved design governing stage for steam turbines.
Steam turbine Nozzle controlling stage Partial arc admission Aerodynamic performance Numerical simulation
Xin Yan Jun Li Yonghui Xie Zhenping Feng Gangyun Zhong Qilin Wu Jianlu Wang
Institute of Turbomachinery, School of Energy & Power Engineering, Xi’an Jiaotong University, Xi’an, Design & Research Department, Dongfang Steam Turbine Works, Deyang, 618001, China
国际会议
2007杭州国际动力工程会议(The International Conference on Power Engineering 2007)
杭州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）