Four triangle mechanical tabs with different area and vertex angle

fixed on the exit of primary nozzle

have been tested comparatively to investigate the effect of number

area(or blockage ratio)

shape and fixed angle of the tabs on the aerodynamic characteristics of the exhaust ejector mixer system.The results show that the application of the mechanical tabs increases the system pressure loss coefficient

but it can improve system pumping coefficient and mixing uniformity

and meliorate the synthetic aerodynamic characteristics of the exhaust ejector mixer system.