The effect of geometry and aerodynamic factors on the flow in trapped vortex cavity was evaluated.The effect of geometry was analyzed by altering the ratio of height to length(H/L) of the cavity

injection position and main-flow inlet angle;the impact of aerodynamics was analyzed by varying main-flow and second inject flow inlet velocity.Total pressure loss was measured by total pressure probe

and the velocity field was measured by particle image velocimetry (PIV).The results reveal that:(1) When the position of the injection holes is in the bottom or the middle position

large scale vortexes can be formed in the trapped vortex cavity.A couple of opposite swirling vortexes are formed in the middle position;and only a single vortex can be formed in the bottom. (2) For the middle injection configuration

increasing the main-flow mach number and inlet angle can enhance the vortex intensity in the upside of the cavity. (3) The total pressure loss increases apparently with the growing main-flow inlet Mach number.