Boundary-layer transition measurements in hypervelocity flows in a shock tunnel

Mee, D. J. (2002) Boundary-layer transition measurements in hypervelocity flows in a shock tunnel. AIAA Journal, 40 8: 1542-1548.


Author Mee, D. J.
Title Boundary-layer transition measurements in hypervelocity flows in a shock tunnel
Journal name AIAA Journal   Check publisher's open access policy
ISSN 0001-1452
Publication date 2002
Sub-type Article (original research)
DOI 10.2514/2.1851
Volume 40
Issue 8
Start page 1542
End page 1548
Total pages 7
Place of publication USA
Publisher American Institute of Aeronautics and Astronautics
Collection year 2002
Language eng
Subject C1
290201 Aerodynamics
780102 Physical sciences
Abstract Experiments to investigate the transition process in hypervelocity boundary layers were performed in the T4 free-piston shock tunnel. An array of thin-film heat-transfer gauges was used to detect the location and extent of the transitional region on a 1500 mm long x 120 turn wide flat plate, which formed one of the walls of a duct. The experiments were performed in a Mach 6 flow of air with 6- and 12-MJ/kg nozzle-supply enthalpies at unit Reynolds numbers ranging from 1.6 x 10(6) to 4.9 x 10(6) m(-1). The results show that the characteristics typical of transition taking place through the initiation, growth, and merger of turbulent spots are evident in the heat-transfer signals. A 2-mm-high excrescence located 440 turn from the leading edge was found to be capable of generating a turbulent wedge within an otherwise laminar boundary layer at a unit Reynolds number of 2.6 x 10(6) m(-1) at the 6-MJ/kg condition. A tripping strip, located 100 mm from the leading edge and consisting of a line 37 teeth of 2 rum height equally spaced and spanning the test surface, was also found to be capable of advancing the transition location at the same condition and at the higher enthalpy condition.
Keyword Engineering, Aerospace
Turbulent Spots
Stability
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Mechanical & Mining Engineering Publications
 
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Created: Tue, 14 Aug 2007, 17:48:04 EST