Supercritical Combustion of Liquid Oxygen (LOX) and Methane Stabilized by a Splitter Plate

A sys tematic numerical analysis has been conducted to explore supercritical mixing and combustion dynamics of liquid oxygen and methane separated by a splitter plate. The unified theoretical/numerical frameworks for the treatment of general fluid thermodynamics have been extended to accommodate turbulence/flame interactions. Different turbulent combustion models have been implemented. The applicability of those models is carefully assessed by comparing the chemical time to the characteristic turbulence time scales. The results indicate that the flamelet assumption is valid and the combustion process is mixing dominant throughout the entire flowfield under the present simulation conditions. The direct -losure approach over-predicts the reaction rate and gives rise to a thickened flame. The flow dynamics and combustion process in the vicinity of the splitter plate are quantified. Simulations of bot h the flamelet model and direct-closure approach confirm that the flame is stabilized by the wake recirculation zone with hot product right behind the splitter plate.

[1]  Oskar Haidn,et al.  Investigation Of Sub- And Supercritical LOX/Methane Injection Using Optical Diagnostics , 2006 .

[2]  Shinji Takahashi,et al.  PREPARATION OF A GENERALIZED CHART FOR THE DIFFUSION COEFFICIENTS OF GASES AT HIGH PRESSURES , 1975 .

[3]  T. A. Zang,et al.  Toward the large-eddy simulation of compressible turbulent flows , 1990, Journal of Fluid Mechanics.

[4]  Howard J. M. Hanley,et al.  Prediction of transport properties. 2. Thermal conductivity of pure fluids and mixtures , 1983 .

[5]  Seong-Young Lee,et al.  Shear and Swirl Coaxial Injector Studies of LOX/GCH4 Rocket Combustion Using Non-Intrusive Laser Diagnostics , 2006 .

[6]  Richard T. Jacobsen,et al.  Thermodynamic Properties of Nitrogen Including Liquid and Vapor Phases from 63K to 2000K with Pressures to 10,000 Bar, , 1973 .

[7]  Nan Zong.  Modeling and Simulation of Cryogenic Fluid Injection and Mixing Dynamics under Supercritical Conditions , 2004 .

[8]  Vigor Yang,et al.  Near-field flow and flame dynamics of LOX/methane shear-coaxial injector under supercritical conditions , 2007 .

[9]  Alec D. Gallimore,et al.  Transport-Property Measurements in the Plume of an SPT-100 Hall Thruster , 1998 .

[10]  Vigor Yang,et al.  Counterflow Diffusion Flames of General Fluids: Oxygen/Hydrogen Mixtures , 2007 .

[11]  Ho-mu Lin.  Modified Soave Equation of State for Phase Equilibrium Calculations , 1980 .

[12]  S. Frankel,et al.  Large eddy simulation of a nonpremixed reacting jet: Application and assessment of subgrid-scale combustion models , 1998 .

[13]  Vigor Yang,et al.  Modeling of supercritical vaporization, mixing, and combustion processes in liquid-fueled propulsion systems , 2000 .

[14]  Sébastien Candel,et al.  Effects of a recess on cryogenic flame stabilization , 1999 .

[15]  Michael S. Graboski,et al.  A Modified Soave Equation of State for Phase Equilibrium Calculations. 1. Hydrocarbon Systems , 1978 .

[16]  R. C. Swanson,et al.  On Central-Difference and Upwind Schemes , 1992 .

[17]  Sébastien Candel,et al.  Transcritical oxygen/transcritical or supercritical methane combustion , 2005 .

[18]  Hiroshi Tamura,et al.  Injection and Mixing Processes in High-Pressure Liquid Oxygen/Gaseous Hydrogen Rocket Combustors , 2000 .

[19]  Vigor Yang,et al.  A unified treatment of general fluid thermodynamics and its application to a preconditioning scheme , 2003 .

[20]  H. Pitsch,et al.  Large-eddy simulation of a turbulent piloted methane/air diffusion flame (Sandia flame D) , 2000 .

[21]  Vigor Yang,et al.  A Preconditioned Flux-Differencing Scheme for Chemically Reacting Flows at all Mach Numbers , 1997 .

[22]  Joseph C. Oefelein,et al.  Modeling High-Pressure Mixing and Combustion Processes in Liquid Rocket Engines , 1998 .

[23]  Howard J. M. Hanley,et al.  Prediction of transport properties. 1. Viscosity of fluids and mixtures , 1981 .

[24]  Vigor Yang,et al.  A numerical study of cryogenic fluid injection and mixing under supercritical conditions , 2004 .

[25]  D. Lentini.  Assessment of The Stretched Laminar Flamelet Approach For Nonpremixed Turbulent Combustion , 1993 .

[26]  Vigor Yang,et al.  Transport and dynamics of liquid oxygen droplets in supercritical hydrogen streams , 2005, Journal of Fluid Mechanics.