The Effect of the Shrouded Rotor Blade Tip Leakage Flow on the Aerodynamic Performance of a One and Half Turbine Stage
The tip leakage flow losses of the shrouded rotor blade contribute significantly to overall losses of the turbine stage. Effects of the shrouded rotor blade tip leakage flow in stator blade/shrouded rotor blade/stator blade on the aerodynamic performance of a 1.5 axial turbine stage were numerical investigated using commercial CFD software CFX-TASCflow. Three conditions with different numbers of sealing fins in the rotor blade shroud were simulated. The structure of the leakage flow and its influence to the next stator were presented. The results show that for shrouded rotor blade the leakage flow is from upstream to downstream of the blade when the leakage flow of the unshrouded blade follows a circumferential way. It is also found that the direction of the up-half span of the flow field is affected obviously when the leakage flow mixed with the main flow and lead to incidence losses to the next stator. The leakage flow which has high radial velocity tends to the mid-span in the following stator and change the flow field structure of the up-half passage. With more sealing fins, the loss of the isentropic efficiency of the stator is reduced. The influence of the leakage flow to the performance of the turbine stage is carefully studied. The work offers a solid theoretical basis and technical support to the design of the steam turbine.
Turbine stage Shroud leakage flow Labyrinth seal Aerodynamic performance Numerical simulation
Jun LI Xin YAN Qiang LV Yonghui XIE Zhenping FENG
Institute of Turbomachinery, School of Energy & Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R.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）