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Evaluating the Effectiveness of Turbulence Models in the Simulation of Two-Phases Combustion


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DOI: https://doi.org/10.15866/iremos.v14i4.20468

Abstract


Supersonic atomized combustion is one of the crucial physical and chemical processes occurring in a jet engine. Numerical simulations of these processes are of scientific and applied interest for the development of high-efficiency jet systems. This paper aims to study the interaction between a fluid jet and a supersonic transverse flow with an analysis of the two-phase mixing process using a large eddy turbulent model based on the Euler-Lagrange method. Favre-filtered Navier-Stokes equations were used to describe the gas phase. The liquid phase was expressed in the form of discrete droplets whose formation was calculated using Kelvin-Helmholtz decay models, Rayleigh-Taylor and Taylor analogy. The results of numerical simulation are in a good consistency with experimental data of other studies. It was found that the behaviour of the gas phase flow is caused by the pressure gradient due to which the high velocity flow enters the atomization zone, deflecting to the near-wall region. The relative gas-liquid velocity was shown to significantly affect the motion of the droplet. High velocity of the gas phase at the leading edge and in the central region of the atomization zone leads to acceleration of the droplets until the relative gas-liquid velocity becomes equal to zero. The results obtained can be used to evaluate the atomization process when designing a scheme for a fluid jet injection into a supersonic flow.
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Keywords


Large Eddy Simulation; Fluid Jet; Two-Phase Supersonic Jet; Euler-Lagrange Model; the Reynolds-Averaged Navier-Stokes Equation; Mixing Process

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