Numerical calculation and experiment were conducted on suction of boundary layer whose separation was induced merely by strong adverse pressure gradient without passage shock.The research was performed for a highly loaded aspirated compressor cascade with large turning angle.Numerical simulation was conducted using MISES which was used for simulating the flow field of quasi-3-D cascade.After deciding the suction position

wind tunnel experiment was conducted.The results show that

loss coefficient is reduced remarkably after suction

and for the boundary layer whose separation is induced merely by strong adverse pressure gradient

the best position for suction lies in where separation has already happened but not fully developed;the suction position can be decided according to the separation in design condition;the suction mass flow required in practice is less than that in calculation; in the numerical calculation

the concrete suction model needs further improvement and correction

in order to make the simulation more accurate.