2022
DOI: 10.1051/aacus/2022033
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Presence and properties of acoustic peaks near the nozzle of impinging rocket jets

Abstract: The presence and properties of acoustic peaks near the nozzle of impinging rocket jets have been investigated. Four jets at a Mach number of 3.1 impinging on a plate at a distance L = 15r0, 20r0, 25r0 and 30r0 from the nozzle, where r0 is the nozzle radius, have been computed using large-eddy simulations. In all cases, upstream-travelling pressure waves are generated by the jet impingement on the plate, with amplitudes decreasing with the nozzle-to-plate distance. The near-nozzle pressure spectra contain peaks… Show more

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Cited by 3 publications
(3 citation statements)
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“…The numerical setup is the same as that of very recent LES of subsonic [14] and supersonic [29,30] impinging jets. The unsteady compressible Navier-Stokes equations are solved in cylindrical coordinates (r, θ, z) using an OpenMP based in-house solver.…”
Section: B Numerical Methodsmentioning
confidence: 99%
“…The numerical setup is the same as that of very recent LES of subsonic [14] and supersonic [29,30] impinging jets. The unsteady compressible Navier-Stokes equations are solved in cylindrical coordinates (r, θ, z) using an OpenMP based in-house solver.…”
Section: B Numerical Methodsmentioning
confidence: 99%
“…The numerical methods used are similar to those in recent LES of subsonic 18,33 and supersonic 39,40 impinging jets. In the simulations, the unsteady compressible Favre-filtered Navier-Stokes equations, namely the equations of conservation of mass, momentum and energy, are solved in cylindrical coordinates ( r , θ , z ) using an OpenMP based in-house solver.…”
Section: Parametersmentioning
confidence: 99%
“…Arthurs and Ziada 21 found that for small stand-off distances, a fluid-dynamic mechanism controls the jet oscillation and for larger stand-off distances, a fluid-resonant mechanism dominates impinging tones. Varé and Bogey 22 discovered that a small standoff distance results in an oscillating normal shock near the plate, generating additional sound waves through shock-leakage. Remarkably, this shock oscillates at frequencies close to the peaks in the near-nozzle pressure spectra.…”
Section: Introduction and State Of The Artmentioning
confidence: 99%