DTIC ADA463676: Fuel Air Injection Effects on pdf

DTIC ADA463676: Fuel Air Injection Effects on

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The effect of direct fuel and air injection was experimentally studied in a cavity-based flameholder in a supersonic flow. Cavity- based fuel injection and flameholding offer an obstruction-free flow path in hydrocarbon-fueled supersonic combustion ramjet (scram jet) engines. Additionally, this study included characterization of the operational limits (i.e., sustained combustion limits) over a variety of fuel and air flow rates. The cavity rearward ramp includes 10 spanwise injection ports at each of 3 axial stations configured to inject air, fuel, and air, respectively. Planar laser-induced fluorescence (PLIF) techniques were utilized to collect planar distributions of the OH radical at various axial locations within the cavity under different flow conditions. A high-speed emissions camera was used to evaluate the combustion across the cavity. Direct injection of both fuel and air provided additional capability to tune the cavity such that a more stable decentralized flame results. The addition of air injection provided the most improvement over the baseline case (fuel only) near the upstream portion of the cavity close to the cavity step

• Creator/s: Defense Technical Information Center
• Date: 7/1/2005
• Year: 2005
• Book Topics/Themes: DTIC Archive, Allen, William, AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS, *SUPERSONIC COMBUSTION, *FUEL INJECTION, SYMPOSIA, LASER DIAGNOSTICS, FLOW VISUALIZATION

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