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- W2327282613 abstract "This paper reports an experimental study on the effects of nozzle-exit boundary-layer conditions on the excitability of heated free jets. The results were obtained at a Mach number 0.8 and total temperatures of 300 K and 670 K. External acoustic excitation was used to excite the jet. The excitation frequencies ranged up to 6 KHZ and the excitation levels were up to 150 dB. A level of 147 dB was used for most of the test points. Nozzle-exit boundary-layer characteristics were controlled by boundary layer tripping upstream of the nozzle exit plane. It has been shown that the free jet mixing rate strongly depends on the boundary-layer characteristics at the nozzle exit. Further, it appears that jets with a thin laminar nozzle-exit boundary layer are more selective about the optimum excitation frequency than those with a thick turbulent nozzle-exit boundary layer. Finally, for the jet of Mach number 0.8, it appears that free jet mixing and development may be controlled by flow excitation as well as by nozzle-exit boundary-layer modifications." @default.
- W2327282613 created "2016-06-24" @default.
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- W2327282613 date "1987-08-17" @default.
- W2327282613 modified "2023-09-23" @default.
- W2327282613 title "Effects of nozzle-exit boundary-layer conditions on excitability of heated free jets" @default.
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- W2327282613 doi "https://doi.org/10.2514/6.1987-2723" @default.
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