Proceedings ArticleDOI
Hysteresis effects in the impinging jet noise
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In this paper, an experimental acoustic investigation of underexpanded free and impinging jet is carried out for various nozzle-plate spacing, and it is observed that the free jet acoustic radiation remains same for both paths but the acoustic radiations differ in some regions.Abstract:
Experimental acoustic investigation of under-expanded free and impinging jet is carried out for various nozzle-plate spacing. The reservoir pressure is slowly increased from atmospheric pressure to 6 bar and than decreased from 6 bar to atmospheric pressure. The free jet acoustic radiation remains same for both paths but it is observed that for impinging jet the acoustic radiations differ in some regions. The hysteresis effect observed in acoustic characteristics may be due to the presence of hysteresis effects in the recirculation zone of the impinging jet. This variation is significant for nozzle-plate spacing of 2 to 4 times jet diameter. It is also seen that the acoustic staging occurs for low pressure and high pressure for small and large nozzle-plate spacing, respectively. Keywords- Impinging jet, OASPL, NPR, Impinging tone, impinging bubbleread more
Citations
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Journal ArticleDOI
On the unsteady dynamics of partially shrouded compressible jets
TL;DR: In this paper, the authors investigate a partially shrouded free-jet exiting from a planar nozzle at two different nozzle pressure ratios (approximately 4 and 5) and show that the inherent jet unsteadiness from the shock-induced flow separation on the wall and the emitted noise in the far-field is strongly coupled through a series of experiments like high-speed schlieren, wall-static pressure, unsteady pressure spectra, and microphone measurements.
Posted Content
On the unsteady dynamics of partially shrouded compressible jets
TL;DR: In this article, the authors investigate a partially shrouded jet exiting from a planar nozzle with a solid wall on one side at two different nozzle pressure ratios and show that the inherent jet unsteadiness from the shock-induced flow separation and the emitted noise in the far field is strongly coupled.
References
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Journal ArticleDOI
Dynamics of an impinging jet. Part 1. The feedback phenomenon
Chih-Ming Ho,N. Nosseir +1 more
TL;DR: In this paper, the authors show that a feedback mechanism is responsible for the sudden change observed in the pressure fluctuations at the onset of resonance in a high-speed subsonic jet impinging on a flat plate.
Journal ArticleDOI
Theoretical model of discrete tone generation by impinging jets
TL;DR: In this article, a new feedback mechanism is proposed for discrete tone generation by impinging jets, which is achieved by upstream-propagating waves associated with the lowest-order intrinsic neutral wave modes of the jet flow.
Journal ArticleDOI
The sound‐producing oscillations of round underexpanded jets impinging on normal plates
TL;DR: In this article, the results of acoustical and optical experiments in which "moderately"" underexpanded sonic round jets impinge on flat plates normal to the jet axis are presented and analyzed.
Journal ArticleDOI
Experiments Concerning Tones Produced By An Axisymmetric Choked Jet Impinging On Flat Plates
B. Henderson,A. Powell +1 more
TL;DR: In this article, an experimental investigation of the sound produced by an axisymmetric supersonic jet impinging on plates with variable size and nozzle-to-plate spacings was performed.
Proceedings ArticleDOI
Flow field and noise characteristics of a supersonic impinging jet
TL;DR: In this paper, the authors examined the flow and acoustic characteristics of an axisymmetric supersonic jet issuing from a Mach 1.5 converging-diverging (C-D) nozzle and impinging on a ground plane.