Large-eddy simulation of compressible turbulent flow in convergent-divergent nozzles with isothermal wall

被引:6
作者
Mahapatra, Susila [1 ]
Nelaturi, Akhil [1 ]
Tennyson, J. A. [1 ]
Ghosh, Somnath [1 ]
机构
[1] Indian Inst Technol Kharagpur, Aerosp Engn, Kharagpur, W Bengal, India
关键词
Large eddy simulation; Convergent-divergent nozzle; DIRECT NUMERICAL-SIMULATION; PRESSURE-GRADIENT; CHANNEL; LAYER;
D O I
10.1016/j.ijheatfluidflow.2019.108425
中图分类号
O414.1 [热力学];
学科分类号
摘要
We present results from high-order accurate large-eddy simulations of compressible flow through convergent-divergent nozzles with and without bell-shaped divergent portions. The nozzles have isothermal walls and circular cross-sections. The incoming flow is a turbulent, subsonic fully-developed pipe flow at M = 0.37 and friction Reynolds number 214. A smooth transition from subsonic to supersonic flow occurs in the nozzles when the back pressure is kept small, accompanied by a reduction of turbulence intensities in the diverging portion of the nozzles. Strong reductions in production and pressure-strain correlations are observed as the flow undergoes acceleration and expansion. When the back pressure is high, the flow in the nozzle remains subsonic, accompanied by a reduction in turbulence in the convergent portion and an amplification in the divergent portion.
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页数:20
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