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- W2328932708 abstract "Measurements have been made of the noise of inverted velocity profile coannular jets (outer greater than inner velocity), statically at model scale. It has been found that an annular jet has both jet mixing and shock-cell noise lower than a round jet and that this benefit is increased when flow is added to the centre of the jet. Consideration of potential application shows that for a conventional turbofan with a large temperature differential between the streams, inverting the flows always gives lower noise but that this is rarely less than that of a single stream jet of the same thrust and mass flow. When both streams are hot and of a similar temperature, however, the inverted profile jet is always quieter. Reductions in peak noise of up to 4 PN dB have been found, but due to the limited angular range of the benefit are estimated to be worth less than 2 EPN dB in flight." @default.
- W2328932708 created "2016-06-24" @default.
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- W2328932708 date "1977-08-16" @default.
- W2328932708 modified "2023-09-26" @default.
- W2328932708 title "The noise characteristics of inverted velocity profile coannular jets" @default.
- W2328932708 cites W1639171001 @default.
- W2328932708 doi "https://doi.org/10.2514/6.1977-1263" @default.
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