Numerical simulations of high-speed chemically reacting flow
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The essentially nonoscillatory (ENO) shock-capturing scheme for the solution of hyperbolic equations is extended to solve a system of coupled conservation equations governing two-dimensional, time-dependent, compressible chemically reacing flow with full chemistry. The thermodynamic properties of the mixture are modeled accurately, and stiff kinetic terms are separated from the fluid motion by a fractional step algorithm. The methodology is used to study the concept of shock-induced mixing and combustion, a process by which the interaction of a shock wave with a jet of low-density hydrogen fuel enhances mixing through streamwise vorticity generation. Test cases with and without chemical reaction are explored here. Our results indicate that, in the temperature range examined, vorticity generation as well as the distribution of atomic species do not change significantly with the introduction of a chemical reaction and subsequent heat release. The actual diffusion of hydrogen is also relatively unaffected by the reaction process. This suggests that the fluid mechanics of this problem may be successfully decoupled from the combustion processes, and that computation of the mixing problem (without combustion chemistry) can elucidate much of the important physical features of the flow.
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- Numerical simulations of high-speed chemically reacting flow
Theoretical and Computational Fluid Dynamics
Volume 6, Issue 2-3 , pp 161-179
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- 1. Department of Mechanical, Aerospace, and Nuclear Engineering, University of California, 90024-1597, Los Angeles, CA, USA
- 2. Department of Mathematics, University of California, 90024-1555, Los Angeles, CA, USA