Solid-gas rotating detonation engines have been widely studied, but experimental limitations have prevented the full information of the flow field from being revealed. This paper describes a numerical investigation of the effect of the equivalence ratio on the two-phase flow field of a rotating detonation engine fueled by carbon and air. The discrete phase model and multiple surface reaction model are employed to determine the flow and combustion of carbon particles. The Reynolds-Averaged Navier-Stokes equations are solved for the gas flow. The results show that a low-temperature air gap appears in place of deflagration in the two-phase flow field, and the gap extends into the products. Before the detonation wave, this air gap is the difference between the air and fuel layers. At higher equivalence ratios, two rotating detonation waves are formed by the contact between the high-temperature products and the fuel-air mixture.
In the present work the temperature fluctuations in a mixing tee were simulated on FLUENT platform using the Large-eddy simulation (LES) turbulent flow model with the sub-grid scale (SGS) model of Smagorinsky-Lilly (SL). The temperature and velocity fields, the normalized mean and fluctuating temperatures and velocities were predicted and analyzed with consideration of buoyancy. The normalized mean and fluctuating temperatures were defined to describe the time-averaged temperature and the time-averaged temperature fluctuation intensity. The numerical results of the normalized mean and fluctuating temperatures were compared with those of the experimental ones published in previous literature, which shows that numerical results have good agreement with the experimental data. The temperature fluctuations and power spectrum densities (PSD) at the locations having the strongest temperature fluctuations both in tee junction and on the walls were analyzed to evaluate the potential of thermal fatigue. The LES flow simulation and power spectral analysis are helpful for the Integrity evaluation of the structures such as the tee junction, elbow, piping system to predict the temperature fluctuation and thermal stripping in a tee junction of mixing hot and cold fluids.
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