Study on Three-dimensional Rotating Detonation Flow Field Structures Based on Large Eddy Simulation
In order to study the characteristics of rotating detonation flow field in annular combustor and the effects of boundary layer,viscosity and turbulence simulation methods on the flow field structure,the open source computational fluid dynamics software OpenFOAM is used to simulate the three-dimensional model of rotating detonation engine(RDE)with hydrogen as fuel and air as oxidant.The characteristics of rotating detonation flow field obtained by Euler equation,large eddy simulation(LES)method and Reynolds-averaged Navier-Stokes(RANS)method are compared and analyzed.The flow field structure from LES simulation is emphatically discussed.The results show that the temperatures of flow fields in the inner,middle and outer sections exhibit no appreciable difference when the slip boundary is applied.However,when the no-slip boundary is utilized,the temperatures of the inner and outer walls are higher than that of the middle section,and the boundary layer will affect the flow velocity of gas in a region close to the wall.As a result,the height of detonation wave on the inner and outer walls is lower than that in the middle section.The boundary layer also affects the flow state of the combustion products,leading to the deformation of wave front on the axial section.The rotating detonation flow field structures obtained by different turbulence simulation methods are similar,indicating that the viscosity is the main factor affecting the rotating detonation flow field structure.The findings are highly significant in terms of elucidating the mechanism by which the viscosity and the boundary layer affect the rotating detonation process.
large eddy simulationrotating detonation combustornumerical simulationflow field struc-ture
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维普
