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Numerical Modeling and Combustion Studies of Scram Jet Simulation

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Technical Report

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Research Foundation of SUNY at Stony Brook Stony Brook United States

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Physical and numerical modeling of turbulent mixing and turbulent combustion in a Scram jet combustion chamber is studied. A high-order finite volume scheme is applied to the flow, accompanied with dynamic subgrid-scale model and local averaging procedure to account for the effect of unresolved small length scales turbulent fluid behavior. The Arrhenius law kinetic mechanism is applied to describe the nonlinearity of chemical reactions. To model combustion, the finite rate chemistry is developed to characterize the combustion process inside the combustion chamber. Results are compared among the finite rate model, the flamelet modelprogress variable approach adopted by Stanford PSAAP center and experimental data. Since the mesh requirement to resolve the flame front is too strictfor most combustion simulation applications, the thickened flame model that artificially expands the flame front is investigated. The effectiveness of the model is studied in a one-dimensional context and applied to the three-dimensional Scram jet simulation. The feasible level of thickening factor is determined to make sure that the major flame features should be preserved. The model is further extended to dynamic thickened flame to account for the coexistence of premixed and diffusion flame in the combustion chamber. In another direction, it is extended to reduced chemical mechanism to cut down the time complexity needed to solve chemistry.

Subject Categories:

  • Fluid Mechanics
  • Combustion and Ignition
  • Jet and Gas Turbine Engines
  • Operations Research

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