Wells 透平失速特性及微圆柱流动控制研究

As an important means of wave energy conversion, Oscillating Water Column device is limited by the stall characteristics of Wells turbines. In this paper, a monoplane Wells turbine with NACA 0015 aerofoil profile is taken as the research object, and the influence of the spanwise leading-edge micro-cylinder parameters on the turbine performance under steady inflow conditions is discussed. The mechanism of micro-cylinders on the stall characteristics and losses of Wells turbine is revealed. The results indicate that the turbulent intensity and momentum mixing in the boundary layer on the suction side of the rotor are enhanced by the wake of the micro-cylinders. The initial separation near the hub of the trailing edge is effectively suppressed. Meanwhile, the strength of the tip leakage vortex reduces, which weakens the interaction between the tip leakage flow and suction passage flow. With the increase of cylinder radius, the cylinder wake vorticity increases, and the separated flow is further inhibited. However, the dissipation loss caused by cylinder wake leads to further reduction of turbine efficiency. When the distance between the cylinder and the leading edge is 10%C (blade chord length) and the cylinder radius is 1%C, the peak torque coefficient increases by 26.57% and the corresponding flow coefficient increases by 19.15%.