CaltechAUTHORS
  A Caltech Library Service

Observations of turbulent reattachment behind an axisymmetric downstream-facing step in supersonic flow

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

[img]
Preview
PDF - Published Version
See Usage Policy.

1723Kb
[img]
Preview
PDF - Erratum
See Usage Policy.

232Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20141202-142049273

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.2514/3.3590DOIArticle
http://arc.aiaa.org/doi/abs/10.2514/3.3590PublisherArticle
http://dx.doi.org/10.2514/3.55305DOIErratum
http://arc.aiaa.org/doi/abs/10.2514/3.55305ErrataErratum
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
Funders:
Funding AgencyGrant Number
Douglas Aircraft Company Independent Research and Development Program80301-016
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

Repository Staff Only: item control page