NDLI: Visualisation of underexpanded jet flowfields in the presence of an intrusive tab

Content Provider	Springer Nature Link
Author	Johnston, Nicholas J. Edgington Mitchell, Daniel M.
Copyright Year	2015
Abstract	This paper investigates the influence of a single intrusive tab has on the flowfield of a supersonic jet. When a tab is added to the jet, an increase in the fundamental screech frequency is observed in acoustic spectra. High resolution schlieren imaging reveals alteration of both the shock structure and preferred instability mode in the jet. Two-point spatial correlation of schlieren images shows the transition from a lateral flapping mode to a punctuated toroid screech mode. This change in dominant instability mode produces a change in coherent structure wavelength that correlates well to the observed screech frequency shift in the acoustic data. The high quality of the schlieren images also allows the counter-rotating vortex pair produced by an individual tab to be identified. Images of the radial density gradient are used to estimate vortex pair location, and a statistical estimate for the trajectory of the vortex pair is produced. The vortex pair path identification technique shows that the path of the vortex pair is constrained close to the exit of the nozzle and increasingly variant in space with greater downstream distance. The vortex trajectory is shown to alter the sonic line and thus the spatial extent of the embedded shock structures.
Starting Page	49
Ending Page	60
Page Count	12
File Format	PDF
ISSN	13438875
Journal	Journal of Visualization
Volume Number	19
Issue Number	1
e-ISSN	18758975
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-09-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aeroacoustics Schlieren Free Jet Supersonic Engineering Fluid Dynamics Computer Imaging, Vision, Pattern Recognition and Graphics Classical Continuum Physics Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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