Effects of Mach Number on the Performance of a Diverterless Supersonic Inlet

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Effects of Mach Number on the Performance of a Diverterless Supersonic Inlet

Askari, R. / Soltani, M. R.

Extensive experiments were conducted on a body-integrated diverterless supersonic inlet (DSI). Diverterless supersonic inlets are designed and developed in order to provide both supersonic flow compression and boundary-layer diversion by using a three-dimensional bump in combination with a suitable cowl lip. The present experiments were performed at three different freestream Mach numbers of $M_{\infty} = 0.75$ , 1.65 (the design Mach number), and 1.85, as well as at 0 deg angles of attack and angles of sideslip. To model the performance accurately, the intake was integrated with a typical forebody including a nose with an elliptical cross section. Wind-tunnel tests were conducted at critical, subcritical, and supercritical operating conditions. The results showed that the present DSI has acceptable performance in these operating conditions and is able to provide the required mass flow and static pressure ratios. For all conditions examined in this study, as a significant result, the fixed geometry of the designed DSI showed acceptable performance in the ranges of supersonic Mach numbers tested: $M_{\infty} = 1.65 - 1.85$ ; furthermore, its operation in the subsonic condition of $M_{\infty} = 0.75$ was satisfactory. It should be mentioned that there were no movable parts or an auxiliary flow control system for this intake.