Generation of Excess Noise by Jets with Highly Disturbed Laminar Boundary-Layer Profiles
نویسندگان
چکیده
The generation of noise by jets with highly disturbed laminar boundary-layer profiles at the nozzle exit, also referred to as initially nominally in literature, is investigated using large-eddy simulation and linear stability analysis. Four a Mach number 0.9 Reynolds , one nonlaminar profile three others profiles, are considered for exit peak turbulence intensities equal 6% case 9% ones. all radiate greater sound pressure levels than jet but weaker initial disturbances. This particularly appears high frequencies thinner boundary layer compared case. These results shown be related dependence on shape most unstable downstream nozzle. For profile, these similar those obtained mixing-layer whereas they higher profile. Despite larger nozzle-exit flow disturbances, this leads longer-term persistence coherent large-scale structures shear layers, hence stronger velocity fluctuations levels, present other one.
منابع مشابه
Effects of moderate Reynolds numbers on subsonic round jets with highly disturbed nozzle-exit boundary layers
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ژورنال
عنوان ژورنال: AIAA Journal
سال: 2021
ISSN: ['0001-1452', '1533-385X', '1081-0102']
DOI: https://doi.org/10.2514/1.j059610