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- W3176288507 abstract "The characteristics of the flow and the noise of shock-containing jets have been studied for nearly three decades. It is now established that broadband shock-associated noise is generated by the interaction of the downstream-convecting coherent structures of the jet flow with the shock cells in the jet plume. The analyses of farfield data have been carried out with the total measured noise, which contains both the turbulent mixing noise and shock noise. In this study, these two components are first separated and extracted from the total spectra, obtained with convergent nozzles. The decomposition is made possible by a recently developed scaling methodology for turbulent mixing noise, which collapses perfectly the mixing noise spectra from jets at all velocities but at a fixed temperature ratio. The characteristics of the shock component alone are investigated. The intensity and the spectra of the shock-associated noise are not affected by jet temperature but mainly controlled by the jet Mach number. However, the shock intensity for the total noise does not scale as the fourth power (shock exponent) of 2 2 D j M M − , but has a weak dependence on jet temperature ratio and the radiation angle; the value of the exponent decreases with increasing jet temperature and increasing inlet angle. This finding is contrary to conventional belief that the intensity is independent of the jet temperature and the observer angle. For the shock component alone, there is no discernible trend for the variation of the exponents with angle and temperature. It is not straightforward to collapse the shock spectra. It is also established for the first time that nonlinear propagation effects are manifested at lower radiation angles, where the shock component is dominant. The physical phenomenon that triggers the onset of nonlinear propagation for the shock noise could not be identified. The characteristics of the correlation functions at the lower radiation angles for subsonic and supersonic jets are different, attesting to the different noise generation mechanisms." @default.
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- W3176288507 date "2008-05-05" @default.
- W3176288507 modified "2023-10-01" @default.
- W3176288507 title "Characteristics of the Shock Noise Component of Jet Noise" @default.
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- W3176288507 doi "https://doi.org/10.2514/6.2008-2835" @default.
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