Mixing Characteristics in a Supersonic Combustor with Gaseous Fuel Injection Upstream of a Cavity Flameholder

Non-reacting experiments and numerical simulations have been performed to investigate the mixing characteristics in a supersonic combustor with gaseous fuel injection upstream of a flameholding cavity in a supersonic vitiated air flow with stream Mach number 1.7. Using helium as simulated fuel, the acetone vapor is adulterated into the fuel jet. The fuel distribution in spanwise and streamwise direction is imaged by the planar laser-induced fluorescence (PLIF) measurement. According to the similarity of experimental observations with different cavities, the typical L/D = 7 cavity with aft wall angle 45° is chosen and the flowfield with the injection is calculated by Large Eddy Simulation. Experimental and numerical results have shown that most of the fuel flow away upon the open cavity with the lifting counter-rotating vortex structures induced by the transverse jet. Only a small portion of the fuel is convected into the cavity shear layer by the vortex interaction of the jet with cavity shear layer, and then transported into the cavity due to the cavity shear layer motion and the interaction of the shear layer with the cavity trailing edge.

[1]  Timothy J. Barth,et al.  High-order methods for computational physics , 1999 .

[2]  Akira Yoshizawa,et al.  A Statistically-Derived Subgrid-Scale Kinetic Energy Model for the Large-Eddy Simulation of Turbulent Flows , 1985 .

[3]  Wright-Patterson Afb,et al.  Parametric Study of 3-D Hydrocarbon Scramjet Engine with Cavity * , 2007 .

[4]  F. Menter.  Two-equation eddy-viscosity turbulence models for engineering applications , 1994 .

[5]  Jack R. Edwards,et al.  Hybrid Simulation Approach for Cavity Flows: Blending, Algorithm, and Boundary Treatment Issues , 2003 .

[6]  Adela Ben-Yakar,et al.  Experimental investigation of mixing and ignition of transverse jets in supersonic crossflows , 2000 .

[7]  F. Billig,et al.  Supersonic Combustion Experiments with a Cavity-Based Fuel Injector (Postprint) , 2001 .

[8]  Jianhan Liang,et al.  Parametric study on self-sustained oscillation characteristics of cavity flameholders in supersonic flows , 2011 .

[9]  Chi-Wang Shu,et al.  High Order ENO and WENO Schemes for Computational Fluid Dynamics , 1999 .

[10]  Hybrid RANS/LES Simulation of Scalar Transport of Slot Injection into a Supersonic Stream , 2007 .

[11]  Ronald K. Hanson,et al.  Cavity Flame-Holders for Ignition and Flame Stabilization in Scramjets: An Overview , 2001 .

[12]  Mailiang Li,et al.  Investigations on Function of Cavity in Supersonic Combustion Using OH PLIF , 2004 .

[13]  Tarun Mathur,et al.  Fundamental Studies of Cavity-Based Flameholder Concepts for Supersonic Combustors , 2001 .

[14]  Hassan Hassan,et al.  Hybrid LES/RANS simulation of a shock wave/boundary layer interaction , 2002 .

[15]  Jeffrey M. Donbar,et al.  Fuel Distribution About a Cavity Flameholder in Supersonic Flow , 2000 .

[16]  Campbell D. Carter,et al.  Mixing and combustion studies using cavity-based flameholders in a supersonic flow , 2004 .

[17]  Xiaoqing Zheng,et al.  Staggered finite volume scheme for solving cascade flow with a k-omega turbulence model , 1994 .