Flow field reconstruction and characteristic analysis of dual-throat control vector nozzle based on dynamic mode decomposition
The three-dimensional flow field of the thrust vectoring nozzle was simulated by detached eddy simulation method,and the pressure coefficient and density gradient distribution of flow field were analyzed.The dynamic modal decomposition(DMD)technology was applied to modal decomposition of the pressure coefficient of the z=0 section,the obtained modal recombination flow field was selected to evolve in time.The results indicated that the first five-order modes obtained by dynamic modal decomposition can be used to reconstruct the pressure coefficient field of the dual-throat control vector nozzle more completely.The first-order mode mainly illustrated the swing phenomenon of the separated shock wave and its influence on the pressure pulsation of the shear layer between the recirculation zone and the main flow;the second-order mode mainly illustrated the separation of the vortex system in the shear layer.The third-order mode mainly illustrated the change in the intensity of the separated shock wave,the fourth and fifth-order modes were mainly manifested as high-order oscillations in the position and intensity of the separated shock wave and the shear layer near the recirculation zone.
NETL
NSTL
万方数据
