Based on Menter's SST k-ω turbulence model coupled with Langtry-Menter transition model

the control mechanism of jet-flap

an active flow control method for PAK-Blow-pressure turbine blade profile

was numerically investigated under different flow conditions including different cascade inlet Reynolds numbers

free stream turbulence levels

and cascade outlet Mach numbers.The results show that the jet-flap effectively reduces flow loss when PAK-Bprofile is stalled.With jet flow mass fraction equal to 2%

relative to the baseline

the energy loss coefficient reduced by about 40%;the flow turning angle increased by about 5%;and the inlet primary flow mass reduced by about 10%.When the flow was not stalled

the control could be ineffective.The results also show that the jet-flap delays boundary layer transition on adjacent blade profile suction side

which in turn delays the boundary layer reattachment.