Fuel/Air Mixing Characteristics of Strut Injections for Scramjet Combustor Applications (Postprint)

Abstract : Numerical studies were performed to determine the fuel/air mixing characteristics of several strut fuel-injection schemes for possible use in round scramjet-combustor applications. Gaseous ethylene was used as the fuel injectant. A total of fourteen strut-injection schemes were conducted with a Mach 2 inflow condition in a rectangular flow path. In addition, the StrutE-s-2 design was simulated in a Mach 3 flow to provide a better understanding of fuel/air mixing capability under various flow conditions. The fuel ports were placed in various locations on the struts, including the leading edge, side, tip and wall. The performance of these strut-injection designs is determined based on the local equivalence ratio, total pressure recovery, and mixing efficiency in a rectangular flow path. Most of the strut designs have a backward-swept angle, except Strut J, which has a forward-swept angle. In general, the backward-swept strut transports the fuel upward toward the core flow. On the other hand, a forward-swept strut carries the fuel toward the bottom wall. Numerical results indicate that StrutE-les-1 has the best performance.

[1]  Andrew D. Cutler,et al.  Effects of Swirl and Skew Upon Supersonic Wall Jet in Crossflow , 2001 .

[2]  M. R. Gruber,et al.  A Streamlined. Pressure-Matched Fuel Injector for Scramjet Application , 2000 .

[3]  Luca Maddalena,et al.  Wall Injectors for High Mach Number Scramjets , 2006 .

[4]  Mohammad Yeakub Ali,et al.  Study on main flow and fuel injector configurations for Scramjet applications , 2006 .

[5]  Sang-Hyeon Lee,et al.  Characteristics of Dual Transverse Injection in Scramjet Combustor, Part 2: Combustion , 2006 .

[6]  Raymond P. Fuller,et al.  Effects of Injection Angle on Atomization of Liquid Jets in Transverse Airflow , 2000 .

[7]  Mitsuhiro Tsue,et al.  CONTROL OF FLAME-HOLDING IN SUPERSONIC AIRFLOW BY SECONDARY AIR INJECTION , 1996 .

[8]  Allan Paull,et al.  Performance of a Scramjet Combustor with Combined Normal and Tangential Fuel Injection , 2006 .

[9]  Mark Gruber,et al.  Aerodynamic Performance of an Injector Strut for a Round Scramjet Combustor (Postprint) , 2007 .

[10]  Campbell D. Carter,et al.  Experimental Study of Cavity-Strut Combustion in Supersonic Flow , 2007 .

[11]  Joseph A. Schetz,et al.  Sonic Injection from Diamond-Shaped Orifices into a Supersonic Crossflow , 2003 .

[12]  Sadatake Tomioka,et al.  Performance of a Dual-Mode Combustor with Multistaged Fuel Injection , 2006 .

[13]  Satyanarayanan R. Chakravarthy,et al.  Mixing in Confined Supersonic Flow Past Strut Based Cavity and Ramps , 2004 .

[14]  Mark Gruber,et al.  New supersonic combustion research facility , 1995 .

[15]  J. C. Dutton,et al.  Transverse Injection from Circular and Elliptic Nozzles into a Supersonic Crossflow , 2000 .

[16]  Satyanarayanan R. Chakravarthy,et al.  Experimental Studies on Supersonic Cold Flow Mixing with Ramp Mixers , 2005 .

[17]  Mark Gruber,et al.  Pylon Fuel Injector Design for a Scramjet Combustor (Postprint) , 2007 .

[18]  Shigeru Aso,et al.  A study of a new ramp injector for improvement of supersonic mixing , 2000 .

[19]  Joseph A. Schetz,et al.  Normal, Sonic Helium Injection Through a Wedge-Shaped Orifice into Supersonic Flow , 1997 .

[20]  Jeffrey M. Donbar,et al.  Experimental assessment of a fuel injector for scramjet applications , 2000 .

[21]  L. A. Povinelli,et al.  Aerodynamic drag and fuel spreading measurements in a simulated scramjet combustion module , 1974 .

[22]  Joseph A. Schetz,et al.  Improved Aerodynamic-Ramp Injector in Supersonic Flow , 2003 .

[23]  Madara Ogot,et al.  Experimental optimization of transverse jet injector geometries for mixing into a supersonic flow , 1998 .

[24]  Joseph A. Schetz,et al.  Tangential Injection from Overlaid Slots into a Supersonic Stream , 1997 .