Simulation of a round supersonic combustor using wall-modeled large eddy simulation and partially-stirred reactor models

Simulations are presented for a generic, round supersonic combustor. Turbulence is modeled in the com-bustor using a wall-modeled large eddy simulation approach. Combustion is modeled using a small quasi -global mechanism and a more detailed skeletal mechanism. Both mechanisms are used in conjunction with two variations of the partially-stirred reactor model for sub-grid turbulence chemistry interactions. Sensi-tivity of the solutions to grid resolution is investigated. It is found that in order to achieve reasonable grid convergence in the mean wall pressure, the model constant that appears in the partially-stirred reactor model must be a function of both the chemistry mechanism and the grid resolution. Most of the combinations of mechanism and turbulent combustion model tested can be tuned in order to predict the location of the pre-combustion shock train and the peak mean pressure in the combustor. It is found that while the different models are able to reproduce the mean wall pressure, there are significant differences in the mean temperature and heat release rate fields. The sensitivity of the different combinations of mechanisms and partially-stirred reactor formulation is quantified and some combinations are found to be more prone to blowout. Two of the tuned models were tested across several fuel equivalence ratios with a single value of the partially-stirred reactor model constant. One model produced reasonable predictions of shock location and peak mean pres-sure for each equivalence ratio. The second model captured the global trends in the mean wall pressure, but was unable to quantitatively predict the shock location and peak mean pressure for all equivalence ratios tested.Published by Elsevier Inc. on behalf of The Combustion Institute.

Automated summary

Simulations were conducted for a round supersonic combustor using a wall-modeled large eddy simulation approach to model turbulence. Combustion was modeled using a small quasi-global mechanism and a more detailed skeletal mechanism. Sensitivity to grid resolution was investigated and a function for the model constant in the partially-stirred reactor model was found. Different combinations of mechanisms and turbulent combustion models can predict the location of the pre-combustion shock train and peak mean pressure, but there are significant differences in temperature and heat release rate fields.