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Direct calculation of acoustic field in pulse jet


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Direct calculation of acoustic field in pulse jet
Zhang HuanhaoChen ZhihuaJiang XiahaiHuang Zhengui
National Key Laboratory of Transient Physics,NUST,Nanjing 210094,China
jet flow shear layers aeroacoustics large-eddy simulation vortex pairing
To discuss the main sources of aeroacoustic field and generation mechanism of acoustic waves,the process of initial flow field development in a subsonic pulse jet is simulated by using the large-eddy simulation and the high-order hybrid-weight essentially non-oscillatory scheme,and the corresponding aeroacoustic field is calculated directly based on the obtained dynamics flow.The numerical results reveal the phenomena of the vortexlets rolled up due to the Kelvin-Helmholtz instability of jet shear layer and the pairing process of neighbor vortices.Calculation results also reveal that the main acoustic sources of the pulse jet include the pulse acoustic source generated by precursor compressible waves,the quadrupole source generated by the vortex pairing and the turbulent blend acoustic sources caused by rolling up,deforming and breakup of the vortexlets within the main vortex ring.The pulse acoustic source is the strongest and the quadrupole source dominates the whole acoustic field.


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Last Update: 2014-04-30