23rd Congress of International Council of the Aeronautical Sciences, 8-13 September, 2002, Toronto, Canada
Paper ICAS 2002-5.10.1

ON HAMMERSHOCK PROPAGATION IN A SUPERSONIC FLOW FIELD

A. R. Porro
NASA Glenn Research Center, USA

Keywords: supersonic inlets, inlet unstart

A wind tunnel test program was conducted to acquire flow-field data during a supersonic propulsion system compressor stall and inlet unstart sequence. The propulsion system, a mixed-compression, two-dimensional inlet coupled to a GE J85-13 turbojet, was mounted beneath a large flat plate that simulated an underwing propulsion pod installation. The experimental results presented herein indicate that the stall-unstart event adversely affects the surrounding flow field on a millisecond time scale and causes a three-dimensional expanding wave front called a hammershock to propagate outward from the inlet.

view full paper