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- W3119795090 abstract "The effect of the nozzle on the instability mechanism of fully expanded supersonic jets is assessed by means of global stability analysis. Two setups are considered: a jet emanating from a convergent nozzle and an additional setup, where the nozzle is replaced by a parallel jet, which allows us to isolate the effect of the nozzle wall on the instability mechanism. Both setups are found to be globally unstable, indicating of absolute instability. It is concluded that the flow is absolutely unstable due to the presence of a sharp streamwise gradient in the base flow and the role of the nozzle is limited to the generation of this gradient. Inclusion of the nozzle walls leads to a reduction of the instability growth rate due to its constraining effect. The vortical, acoustic and thermal components of the eigenfunctions are analyzed using the momentum potential theory by Doak" @default.
- W3119795090 created "2021-01-18" @default.
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- W3119795090 date "2021-01-04" @default.
- W3119795090 modified "2023-09-30" @default.
- W3119795090 title "The vortical, acoustic and thermal components of global eigenfunctions of supersonic jets" @default.
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- W3119795090 doi "https://doi.org/10.2514/6.2021-1414" @default.
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