Distinctions between single and twin impinging jet dynamics

نویسندگان

چکیده

Impinging jets are characterized by an acoustic feedback resonance capable of generating intense tones. This investigation examines changes in single impinging jet (SIJ) dynamics when another is added alongside to form a dual (DIJ) arrangement interest vertical takeoff and landing applications. The emphasis on the hydrodynamic coupling region between jets, which affects aircraft surface loading. Well-resolved large eddy simulations SIJ DIJ employed with under-expanded Mach 1.27 jets; nozzle exits placed 4 diameters from ground plane and, for DIJ, separated 4.3 each other mimic ongoing experiments. Three different harmonics fundamental frequency identified using two-point space-time correlations. Using spectral proper orthogonal decomposition, these tones classified as either asymmetric or axisymmetric modes SIJ. Each individual configuration also exhibits nominal However, differences observed inboard sides where effects engender azimuthally localized Kelvin–Helmholtz instability impingement mechanism. global two manifests counter-rotating helical modes, reinforce lowest three

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ژورنال

عنوان ژورنال: Journal of the Acoustical Society of America

سال: 2021

ISSN: ['0001-4966', '1520-9024', '1520-8524']

DOI: https://doi.org/10.1121/10.0005727