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Estimation of convection speed in underexpanded jets from schlieren pictures
KTH.
2016 (English)In: 22nd AIAA/CEAS Aeroacoustics Conference, 2016, American Institute of Aeronautics and Astronautics Inc, AIAA , 2016Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, the quality of the estimation of the convection velocity in jet shear layers using schlieren pictures is investigated. The aim is to discuss whether the convection velocity is likely to be biased if determined from schlieren images obtained at a high frame rate, as in previous experiments using the phase shift method. For this, a numerical procedure is developed in order to generate schlieren-like images on the basis of simulation data, and applied to the results provided by the large-eddy simulation (LES) of an under expanded round jet at an ideally expanded Mach number of 1.56. The results obtained from the schlieren pictures are compared with those obtained directly from the LES density fields. It is notably found that the location of the maximum of gray level fluctuations in the schlieren pictures corresponds well to that of the maximum of density fluctuations, and that the convection velocity estimated for low frequencies using schlieren pictures is underestimated for small separation distances between the two points used for the phase shift calculation. 

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics Inc, AIAA , 2016.
Keywords [en]
Aeroacoustics, Shear flow, Convection velocity, Density fluctuation, High frame rate, Numerical procedures, Phase-shift method, Schlieren picture, Separation distances, Under-expanded jets, Large eddy simulation
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-246631DOI: 10.2514/6.2016-2984Scopus ID: 2-s2.0-85057294622OAI: oai:DiVA.org:kth-246631DiVA, id: diva2:1325738
Conference
22nd AIAA/CEAS Aeroacoustics Conference, 2016, 30 May 2016 through 1 June 2016
Note

QC 20190617

Available from: 2019-06-17 Created: 2019-06-17 Last updated: 2019-06-17Bibliographically approved

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