Roshko, Anatol and Thomke, Gerald J. (1966) Observations of turbulent reattachment behind an axisymmetric downstream-facing step in supersonic flow. AIAA Journal, 4 (6). pp. 975-980. ISSN 0001-1452. https://resolver.caltech.edu/CaltechAUTHORS:20141202-142049273
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Abstract
Supersonic flow over a downstream-facing step on the circumference of a large, ducted, axisymmetric body was used to study flow reattachment. Step heights h were 0.25, 1.00, and 1.68 in., compared to a body radius of 6 in. Freestream Mach numbers were in the range 2 to 4.5. Theturbulent boundary-layer thickness just ahead of the step varied from 0.14 to 0.19 in. (momentum thicknesses of about 0.01 in.). Surface pressure distributions throughout the region of separation and reattachment were measured, and points of reattachment were determined. Comparison of the shapes of the pressure distributions for various step heights shows that the initial (steepest) parts of the reattachment pressure rise, up to the point of reattachment, tend to become superimposed when plotted against x/h. Downstream reattachment the curves branch out, exhibiting a dependence on geometry and probably on initial shear layer profile. In the region of the initial pressure rise (near the end of the "dead air" region) dynamic pressures are low; the pressure rise there apparently is balanced by turbulent shear stress.
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Additional Information: | © 1966 AIAA. Received May 17, 1965; revision received March 17, 1966. This study was sponsored by the Douglas Aircraft Company Independent Research and Development Program, Account 80301-016. The authors are indebted to many staff members of the Douglas Aerophysics Laboratory, El Segundo, California, who contributed to the experimental program. Particular thanks go to W. E. Smith for his extensive help in preparing the experiment and report, and for many helpful discussions. | |||||||||||||||
Errata: | Errata: "Observations of Turbulent Reattachment behind an Axisymmetric Downstream-Facing Step in Supersonic Flow" ANATOL ROSHKO, GERALD J. THOMKE AIAA Journal, 1966, Vol.4: 2257b, 10.2514/3.55305 | |||||||||||||||
Group: | GALCIT | |||||||||||||||
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Issue or Number: | 6 | |||||||||||||||
Record Number: | CaltechAUTHORS:20141202-142049273 | |||||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20141202-142049273 | |||||||||||||||
Official Citation: | A. ROSHKO and G. J. THOMKE. "Observations of turbulent reattachment behind an axisymmetric downstream-facing step in supersonic flow." AIAA Journal, Vol. 4, No. 6 (1966), pp. 975-980. doi: 10.2514/3.3590 | |||||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||||||||
ID Code: | 52286 | |||||||||||||||
Collection: | CaltechAUTHORS | |||||||||||||||
Deposited By: | George Porter | |||||||||||||||
Deposited On: | 02 Dec 2014 22:38 | |||||||||||||||
Last Modified: | 03 Oct 2019 07:41 |
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