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- W2077329669 abstract "The work of Viswanathan and others in recent years has raised serious questions about jet noise databases such as that of Tanna - the two underlying concerns being noise contamination and the effect of Reynolds number - and as a result it has been argued that the effects of temperature have been misunderstood in the past. In this paper, we have compared the Tanna data with that of QinetiQ [1983], which has a similar nozzle size and hence Reynolds number to that of the data of Viswanathan and although we find similar differences, we argue there are other reasons for this. Apart from extensive rig validation, Tanna & Morris repeated their static tests with a simulated flight stream and a substantial flight effect was observed. This would not have been possible if there had been significant noise contamination. In fact, these differences are more likely due to some other effect related to comparing data from two different facilities and/or two different nozzles, as shown by Bridges & Brown and discussed in depth by Harper-Bourne at this conference. It is concluded the available experimental evidence still strongly indicates the presence of an additional dipole source due to heating that scales on the sixth power of jet velocity. A brief review of recent flow-acoustic interaction computations based on the Lilley-Goldstein equation has confirmed that flowacoustic interactions cannot be the main reason for the effects of heating at low velocity ratios even though the quadrupole source in sheared flow is clearly ‘amplifying’ the sound radiation at low frequencies. Finally convective amplification effects are briefly considered in both isothermal and heated jets" @default.
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- W2077329669 date "2009-05-11" @default.
- W2077329669 modified "2023-09-27" @default.
- W2077329669 title "Jet Mixing Noise: A Review of Single Stream Temperature Effects" @default.
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- W2077329669 doi "https://doi.org/10.2514/6.2009-3376" @default.
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