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摘要
High-fidelity simulations with a validated methodology are employed to explore the physical processes associated with different injection strategies on supersonic combustion. The configurations consider a commonly employed open single-cavity flameholder. The effects of different injector locations and injection angles are examined under the constraint that the total fuel mass flow rate is the same. The numerical approach solves the full three-dimensional Navier-Stokes equations, supplemented with a two-equation k-omega turbulence closure. The specific injection locations include 10 different arrangements that examine fuel injection upstream of the cavity, on the backward step, on the cavity bottom wall, and on the downstream ramp. The angles of the fuel port injection slots include combinations of parallel and 27 and 90 deg to the airflow inside the cavity. One case with a closed cavity is also examined for comparison. The simulations are employed to characterize the performance with qualitative and quantitative mixing metrics. Detailed analysis of the results reveals both expected and unexpected findings. As anticipated, the closed cavity performs poorly relative to its open counterpart. However, an injection strategy that enhances the natural circulation pattern of the cavity is found to be superior to one that opposes it. Another counterintuitive finding is that although direct injection of the fuel upstream of the cavity into the main stream results in deeper penetration, the fuel from different injectors remains distinct, with relatively small spanwise mixing. On the other hand, injection on the floor of the cavity results in more diffused fuel distribution.
- 出版日期2012-10
