Abstract
The inlet is an important component in high-speed airbreathing engines. Whereas a variable-geometry inlet maximizes performance, it adds weight and complexity to the engine. Fixed-geometry inlets are limited to low contraction ratios to allow the initial normal shock to beswallowed and the engine to start. A novel e xed-geometry inlet cone guration that uses a high-speed jet to act as the contact surface and compress the air is computationally investigated. Adjusting the jet pressure alters the contact surface and allows shock-on-lip conditions to be maintained over a range of e ight Mach numbers without a movable e owpath. This cone guration allows a low-blockage e owpath forlowe ightspeeds, resultinginlowspillage, whilemaintaining highcompression inscramjetmode. Flow solutions are obtained using a Navier ‐Stokes solver. Flowe eld details are presented and discussed, including the shock patterns and mixing between the jet and air. Shock-on-lip is demonstrated at varying e ight Mach numbers, and associated effects on the e owe eld are presented. Global analysis indicates that minimizing jet mass e ow is a key to applying this concept to practical engines.
Published Version
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