Investigation of the effect of chemistry models on the numerical predictions of the supersonic combustion of hydrogen
- Department of Mechanical Engineering, Indian Institute of Technology, Madras, India 600 (India)
In this numerical study, the influence of chemistry models on the predictions of supersonic combustion in a model combustor is investigated. To this end, 3D, compressible, turbulent, reacting flow calculations with a detailed chemistry model (with 37 reactions and 9 species) and the Spalart-Allmaras turbulence model have been carried out. These results are compared with earlier results obtained using single step chemistry. Hydrogen is used as the fuel and three fuel injection schemes, namely, strut, staged (i.e., strut and wall) and wall injection, are considered to evaluate the impact of the chemistry models on the flow field predictions. Predictions of the mass fractions of major species, minor species, dimensionless stagnation temperature, dimensionless static pressure rise and thrust percentage along the combustor length are presented and discussed. Overall performance metrics such as mixing efficiency and combustion efficiency are used to draw inferences on the nature (whether mixing- or kinetic-controlled) and the completeness of the combustion process. The predicted values of the dimensionless wall static pressure are compared with experimental data reported in the literature. The calculations show that multi step chemistry predicts higher and more wide spread heat release than what is predicted by single step chemistry. In addition, it is also shown that multi step chemistry predicts intricate details of the combustion process such as the ignition distance and induction distance. (author)
- OSTI ID:
- 21168981
- Journal Information:
- Combustion and Flame, Vol. 156, Issue 4; Other Information: Elsevier Ltd. All rights reserved; ISSN 0010-2180
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMBUSTION
HYDROGEN
CHEMISTRY
SUPERSONIC FLOW
MATHEMATICAL MODELS
WALLS
COMPRESSIBLE FLOW
TURBULENT FLOW
DISTANCE
EFFICIENCY
HEAT
IGNITION
INDUCTION
MASS
METRICS
PERFORMANCE
SIMULATION
STAGNATION
TURBULENCE
THREE-DIMENSIONAL CALCULATIONS
Supersonic combustion
Numerical simulations
Supersonic reacting flow