Acoustic feedback loops for screech tones of underexpanded free round jets at different modes

The flow structures and the acoustic feedback loops of underexpanded round jets are investigated by numerical simulations. The jets have a Mach number of 1 at the nozzle exit and a diameter-based Reynolds number of $2.5 \times {10^3}$. Three nozzle pressure ratios (NPRs) of 2.2, 2.4 and 2.6 are cons...

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Veröffentlicht in:	Journal of fluid mechanics 2020-11, Vol.902, Article A17
Hauptverfasser:	Li, Xiang-Ru, Zhang, Xi-Wen, Hao, Peng-Fei, He, Feng
Format:	Artikel
Sprache:	eng
Schlagworte:	Acoustic propagation Acoustic waves Acoustics Computational fluid dynamics Computer simulation Diameters Feedback Feedback loops Flow structures Fluid flow Fluid mechanics High Reynolds number Jets JFM Papers Mach number Mathematical models Modes Noise Nozzles Numerical analysis Pressure Propagation modes Ratios Reynolds number Screech tones Simulation Standing waves Vortices Wave propagation Wavelengths Wavelet analysis Wavelet transforms
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