In order to study the effect of spacing λ of vortex generators(VGs) on the control boundary layer separation

4 kinds of vortex generators spacing were selected

and λ/H(H is the height of vortex generators) respectively were 5

7

9

11. The boundary layer separation flow of adverse pressure gradient and VGs control flow separation were simulated by large eddy simulation(LES) method. The evolution of the large scale coherent structure in turbulent flow field were analyzed with and without VGs control

and the influence of VGs spacing on the flow separation control effect were investigated from vortex spacing

fluid kinetic energy in the boundary layer

loss of pressure difference

etc. The research results show that when λ/H is 5

the spacing of VGs is too small

so that the spanwise development of vortex are suppressed

when λ/H are 9

11

the spacing of VGs is too large lead to the fluid kinetic energy in the boundary layer is too low

when the spacing of VGs is λ/H is 7

the effect of flow control is better

then the pressure loss of calculation domain is minimum

compared with no VGs control

pressure loss is reduced by 30.95%.