Journal ArticleDOI
Aeroacoustic modal analysis of underexpanded pipe jets with and without an upstream cavity
Kabilan Baskaran,K.N. Srinivasan +1 more
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TLDR
In this article, aero-acoustics of an underexpanded pipe-cavity jet are investigated experimentally using high-speed schlieren imaging techniques.Abstract:
The investigation of the aeroacoustics of an underexpanded pipe-cavity jet is carried out experimentally. Two different aspect ratios of the cavity are tested for a wide range of nozzle pressure ratios. Both internal and externally radiated pipe-cavity acoustics are studied. Linear and higher-order spectral analyses are implemented on the unsteady cavity pressure to comprehend the nature of the cavity acoustics and nonlinear interactions of different acoustic modes of the pipe–cavity system. Results show that an increase in depth leads to an enhancement in the nonlinear interactions. Furthermore, the power spectral and overall sound pressure level analyses of pipe and pipe-cavity jet noise radiation are carried out. High-speed schlieren imaging techniques are used to understand jet dynamics. Highly unsteady motion of the jet initial shear layer is observed due to an upstream disturbance of the cavity. In addition, proper orthogonal and dynamic mode decomposition methods are used to extract the spatial and dynamic modes of the jet structure. These methods are used to segregate the cavity associated jet dynamics and screech dynamics.read more
Citations
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Journal ArticleDOI
Shock and shear layer interaction in a confined supersonic cavity flow
TL;DR: In this paper, the impinging shock of varying strengths on the free shear layer in a confined supersonic cavity flow is studied numerically using the detached-eddy simulation, and the resulting spatiotemporal variations are analyzed between the different cases using unsteady statistics, spectral analysis, and modal decomposition.
Journal ArticleDOI
Shock and shear layer interactions in a confined supersonic cavity flow
TL;DR: In this article, the impinging shock of varying strengths on the free shear layer in a confined supersonic cavity flow is studied numerically using the detached eddy simulation, and the resulting spatiotemporal variations are analyzed between the different cases using unsteady statistics, x-t diagrams, spectral analysis, and modal decomposition.
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References
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Journal ArticleDOI
Effects of upstream pipe length on pipe-cavity jet noise
Kabilan Baskaran,K.N. Srinivasan +1 more
TL;DR: In this article, an experimental study is carried out to quantify the acoustic radiation of underexpanded pipe-cavity jet noise, and the results show that the pipe cavity resonates close to the combined tangential-longitudinal mode, with a small increase in screech tonal noise.
Journal ArticleDOI
Acoustic Mode Analysis of a Supersonic Jet
TL;DR: In this paper, the dynamics of a supersonic jet emanating from a high-aspect-ratio rectangular nozzle is investigated using dynamic mode decomposition, which is applied to flowfield data obtained from a large-eddy simulation and the significance of each extracted mode to the snapshot data series is determined using a sparsity-promoting method.
Journal ArticleDOI
Nonlinear aspects of supersonic flow past a cavity
TL;DR: In this paper, a study of supersonic flow over wall-mounted cavities for two different length/depth (L/D) ratios is carried out experimentally, where the authors used a higher-order spectral technique to determine whether multiple tones are due to possible nonlinear interactions between the primary cavity modes (Rossiter modes) or not.
Journal ArticleDOI
Aeroacoustic characteristics of subsonic flow from axisymmetric pipe-cavities
Kabilan Baskaran,K.N. Srinivasan +1 more
TL;DR: In this paper, a detailed experimental study on the acoustic characteristics of an axisymmetric pipe-cavity jet is conducted for different ratios of cavity depth to length, over a range of subsonic Mach numbers.
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