Interaction and Penetration of Fuel Jets in Supersonic Crossflows

The extent of fuel interaction and penetration in a supersonic crossflow governs the ignition and combustion characteristics of a supersonic combustor. A comprehensive series of experiments have been conducted to determine the interaction and penetration characteristics. The cases of injection from a plain wall, stepped wall and wedge strut as well as normal, parallel and parallel/normal injection were considered It was found that the extent of jet penetration at a given distance downstream was governed by the jet/air momentum ratio and the injector port diameter. It was found that jet penetration in a supersonic cross flow was higher than in a subsonic cross flow. For a supersonic cross flow, injection behind a step led to higher jet penetration than injection ahead of a step. Injection ahead of a step yielded a higher penetration than injection from a plain wall, Parallel/normal injection from a wedge strut appeared to indicate good initial mixing