CARS Thermometry in a Supersonic Combustor for CFD Code Validation

Abstract An experiment has been conducted to acquire datafor the validation of computational fluid dynamics (CFD)codes used in the design of supersonic combustors. Theprimary measurement technique is coherent anti-StokesRaman spectroscopy (CARS), although surface pressuresand temperatures have also been acquired. Modern-design-of-experiment techniques have been used tomaximize the quality of the data set (for the given level ofeffort) and minimize systematic errors. The combustorconsists of a diverging duct with single downstream-angled wall injector. Nominal entrance Mach number is 2and enthalpy nominally corresponds to Mach 7 flight.Temperature maps are obtained a! several planes in theflow for two cases: in one case the combustor is piloted byinjecting fuel upstream of the main injector, the second isnot. Boundary conditions and uncertainties are adequatelycharacterized. Accurate CFD calculation of the flow willultimately require accurate modeling of the chemicalkinetics and turbulence-chemistry interactions as well asaccurate modeling of the turbulent mixing.

[1]  M. E. Hillard,et al.  Intensified silicon photodiode array detector linearity: application to coherent anti-Stokes Raman spectroscopy. , 1984, Applied optics.

[2]  Glenn S. Diskin,et al.  Conventional/laser diagnostics to assess flow quality in a combustion-heated facility , 1999 .

[3]  J. Philip Drummond,et al.  A two-dimensional numerical simulation of a supersonic, chemically reacting mixing layer , 1988 .

[4]  A. Eckbreth.  Optical splitter for dynamic range enhancement of optical multichannel detectors. , 1983, Applied optics.

[5]  Douglas C. Montgomery,et al.  Response Surface Methodology: Process and Product Optimization Using Designed Experiments , 1995 .

[6]  J. I.  The Design of Experiments , 1936, Nature.

[7]  Glenn S. Diskin,et al.  Fuel-Air Mixing and Combustion in Scramjets , 2002 .

[8]  J. Brian Gray,et al.  Introduction to Linear Regression Analysis , 2002, Technometrics.

[9]  George E. P. Box,et al.  Empirical Model‐Building and Response Surfaces , 1988 .

[10]  A. Cutler,et al.  Coherent anti-Stokes Raman spectroscopy temperature measurements in a hydrogen-fueled supersonic combustor , 1993 .

[11]  Andrew D. Cutler,et al.  An Experimental and CFD Study of a Supersonic Coaxial Jet , 2001 .

[12]  A. Eckbreth.  Laser Diagnostics for Combustion Temperature and Species , 1988 .

[13]  N. Draper,et al.  Applied Regression Analysis , 1966 .

[14]  F. Yueh,et al.  Simultaneous N(2), CO, and H(2) multiplex CARS measurements in combustion environments using a single dye laser. , 1988, Applied optics.