Effects of Reynolds numbers

free stream turbulence intensities (FSTI) and angle of attack on the steady boundary layer development of an ultra-high-lift low-pressure turbine blade were investigated.The three different types of passive separation control devices

which were dimple

cylindrical wire and rectangular trip

were investigated to further improve the blade performance.Numerical simulation results show that:as the Reynolds increases the profile loss decreases;as the FSTI increases

the profile loss decreases

and then increases;as the attack angle increases in the negative direction

the profile loss decreases

and then increases; as the attack angle increase in the positive direction

the profile loss increases rapidly;when the Reynolds number and the FSTI changes

it is found that the dimple can suppress the separation bubble better and when the attack angle changes

it is found that the wire and strip can suppress the separation bubble better.It is also found that the three passive control methods hasten the transition process so the separation is suppressed

but it increases the turbulent wetted area.