Numerical simulation on secondary flow control of vortex chamber in the front of turbine stator cascade

Computational fluid dynamics are used to solve the three-dimensional flow field of turbine stator cascade with vortex chamber in the front of turbine stator cascade.The pneumatic characteristic and secondary flow of stator cross section through flow direction are analyzed.The result shows that vortex chamber in the front of stator can reduce the secondary loss gradually.By comparison with different depths and angles of vortex chambers,it is found that the increase of depth and angle will greatly improve the stator secondary flow control.Essentially,the reason is due to the imbibition effect of vortex chamber,which increases the turbulence in boundary layer and decreases the boundary layer thickness.