Research on the Flow Separation Control in Hydrodynamic Coupling Based on Numerical Simulation

Flow separation should be controlled to improve performance for its adverseness in flow field. The separation flow in complex three-dimension viscous fluid with rotation effects in hydrodynamic coupling is analyzed. The method of drilling holes in turbine vane is employed to control flow separation in hydrodynamic coupling. The 3D flow field before and after drilling in turbine vanes is simulated and analyzed by CFD software. The characteristics of hydrodynamic coupling are predicted based on the numerical solution of the 3D flow field. The predicted characteristics are compared with the experimental results and the error range is less than 10%. It is proved that the numerical simulation method is accurate in flow field characteristics prediction. Compared with the holeless turbine vane, the performance of hydrodynamic coupling is improved remarkably after drilling holes in turbine vane. The method of drilling holes in the turbine vane to control the separation flow is economical and feasible.