A Review of Vortex Model Development for Rectangular Turbine Cascades

Six valuable vortex models for the rectangular turbine cascades are considered and the mechanisms of their evolution are discussed.The review comes to a conclusion that the substance of the vortex controlling technology in aerodynamic field is an attempt to construct or reconstruct the vortex structure.Therefore the future improvement in the flow efficiency of the turbine cascades is the optimum matching between cutting and expansion of the gas curved flow by controlling the strength,length and location of the passage vortex at outlet plane.