The aerodynamic characteristics of a design Mach number of 5 two-dimensional inlet with mixed-compression during reentry under typical condition were investigated experimentally using wind tunnel and simulation. The results show that: when the free stream Mach number is higher than the design Mach number of 5

the external ramp oblique shocks of inlet intersect in advance and impinge on the cow inner surface

causing shock-shock interaction in combination with the cow oblique shock. Though the flow separations occur

the turbulence intensities upstream the inlet exit are less than 3.337 and 3.256 respectively when the free stream Mach numbers are 7 and 6

and the power spetrum density of the dynamic pressure signals in the duct generally presents the characteristics of white noise

causing little damage to the structure of the engine. Accordingly

in order to improve the mass flow of the inlet working over a wide rang of free stream Mach number

the design Mach number of inlet can be reduced properly.