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Fluctuation measurements in the near wake of a slender wedge at Mach 4.0 with and without base injection

Behrens, W. and Lewis, John E. (1968) Fluctuation measurements in the near wake of a slender wedge at Mach 4.0 with and without base injection. In: 6th Aerospace Sciences Meeting. AIAA . https://resolver.caltech.edu/CaltechAUTHORS:20170807-145720584

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Abstract

An experimental investigation of the turbulent and transitional near wake of an adiabatic, slender wedge with and without base injection was performed in the JPL Supersonic Wind Tunnel at Mach 4. Two different quantities were measured with a constant current hot wire anemometer, the mean square fluctuation intensity (f – 0.1 to 80 KC), and the frequency spectrum of the fluctuations (f = 5 to 200 KC, bandwidth 0.2 KC). The various flow regions of the near wake were identified and the growth and decay of flow fluctuations were determined. Helium and nitrogen were used as injectants and similar effects were obtained when He = N2. The flow fluctuations of the turbulent boundary layer remnant rapidly decayed during the expansion, and the inner shear layers and the reverse flow region which they bound were laminar. Base injection was found to significantly alter the near wake instability mechanism, which resulted in the delay of wake transition.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.1968-100DOIArticle
https://arc.aiaa.org/doi/10.2514/6.1968-100PublisherArticle
Additional Information:© 1968 AIAA. This work was supported by ARPA/AMICON under contract DA-01-021AMC-13094(Z). The authors also wish to acknowledge the constructive criticisms of Dr. W. H. Webb of TRW Systems.
Funders:
Funding AgencyGrant Number
Advanced Research Projects Agency (ARPA)DA-01-021AMC-13094(Z)
Record Number:CaltechAUTHORS:20170807-145720584
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170807-145720584
Official Citation:Fluctuation measurements in the near wake of a slender wedge at Mach4.0 with and without base injection W. BEHRENS and J.E. LEWIS 6th Aerospace Sciences Meeting. New York, NY, U.S.A.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79865
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Aug 2017 22:10
Last Modified:03 Oct 2019 18:24

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