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The paper presents the unsteady numerical simulation results of tip leakage   flow in high-pressure steam turbines, and also presents the influence   analysis of leakage vortexes on pressure fluctuation characteristics of   rotor cascade under different blade tip seal clearances. The numerical   method for calculating is based on the Large Eddy Simulation (LES)   turbulence model and the pressure fluctuation of rotor cascade which induced   by the unstable leakage vortexes is obtained by frequency spectrum analysis.   The results show that the vortex frequencies in tip seal cavity contain both   the wheel rotating frequency and the high frequency caused by the tip   leakage flow breaking into small scale vortexes. The unsteady   characteristics of tip leakage flow also inducesteam exciting force which   changes with the time.

Investigation on the unsteady pressure fluctuation characteristic in the blade tip seal of steam turbine based on spectrum