Journal ArticleDOI
HIFiRE-1 Ascent-Phase Boundary-Layer Transition
Roger L. Kimmel,David Adamczak,Allan Paull,Ross Paull,Jeremy Shannon,Robert Pietsch,M. Frost,Hans Alesi +7 more
TLDR
In this paper, the authors measured boundary-layer transition in hypersonic flight on a 7-deg half-angle axisymmetric cone with a small bluntness of 2.5mm.Abstract:
The Hypersonic International Flight Research Experimentation (HIFiRE) program is a hypersonic flight test program. The primary experiment for flight one, launched in March 2010, was to measure boundary-layer transition in hypersonic flight on a nonablating, 7 deg half-angle axisymmetric cone with a small bluntness of 2.5 mm radius. The flight gathered pressure, temperature, and heat transfer measurements during ascent and reentry. Although the vehicle reentered the atmosphere at a higher-than-intended angle of attack, the ascent portion of the flight provided smooth-body boundary-layer transition data at freestream Mach numbers greater than 5, where transition was presumed to be dominated by second-mode instability. The angle of attack during this portion of the flight was less than 1 deg. The end of turbulent-to-laminar transition occurred at Reynolds numbers between 10.3×106 and 12.2×106, based on x-location and freestream conditions. Transition was correlated with second-mode N-factors of approximately...read more
Citations
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Journal ArticleDOI
Transition Analysis for the Ascent Phase of HIFiRE-1 Flight Experiment
TL;DR: In this paper, a computational analysis of the measured in-flight transition behavior during the ascent phase is presented, which indicates that the most likely cause for transition during the flight window of 19 to 22.5 s is the amplification of second-mode instabilities in the laminar boundary layer.
Proceedings ArticleDOI
HIFiRE-5b Flight Overview
Roger L. Kimmel,David Adamczak,David Hartley,Hans Alesi,M. Frost,Robert Pietsch,Jeremy Shannon,Todd Silvester +7 more
Journal ArticleDOI
Optimal Growth in Hypersonic Boundary Layers
TL;DR: In this paper, the authors investigated the optimal growth characteristics in the hypersonic Mach number regime without any highenthalpy effects, with particular emphasis on the role of the initial disturbance location and the value of the spanwise wave number that leads to the maximum energy growth up to a specified location.
Journal ArticleDOI
First and Fifth Hypersonic International Flight Research Experimentation’s Flight and Ground Tests
Roger L. Kimmel,David Adamczak,Matthew P. Borg,Joseph S. Jewell,Thomas J. Juliano,Scott Stanfield,Karen T. Berger +6 more
TL;DR: The Hypersonic International Flight Research Experimentation (HIFiRE) program is a hypersonic flight-test program executed by the U.S. Air Force Research Laboratory and the Australian Defence Scien...
Journal ArticleDOI
Effect of Wall Blowing on Hypersonic Boundary-Layer Transition
Fernando Miró Miró,Pieter Dehairs,Fabio Pinna,Maria Gkolia,Davide Masutti,Tamas Regert,Olivier Chazot +6 more
TL;DR: In this article, an investigation of outgassing effects on boundary-layer transition was carried out, which mimicked heat-shield pyrolysis in atmospheric reentry cond...
References
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Journal ArticleDOI
Turbulent Boundary Layer in Compressible Fluids
TL;DR: In this paper, a general formula for skin friction, including heat transfer to a flat plate, was developed for a thin turbulent boundary layer in compressible fluids with zero pressure gradient, and curves were presented giving skin-friction coefficients and heat-transfer coefficients for air for various wall-to-free-stream temperature ratios and free-stream Mach Numbers.
Journal ArticleDOI
Effects of Roughness on Hypersonic Boundary-Layer Transition
TL;DR: The effect of roughness on hypersonic boundary layer transition has been studied for three primary purposes: to trip a laminar layer to turbulence, to determine whether naturally occurring roughness is expected to cause early transition, and to determine the largest allowable roughness that will not affect the location of transition as mentioned in this paper.
Journal ArticleDOI
Flight Data Analysis of the HyShot 2 Scramjet Flight Experiment
TL;DR: In this paper, a ballistic reentry vehicle experiment called HyShot was devised to achieve supersonic combustion in flight above Mach 7.5 using a double wedge intake and two back-to-back constant area combustors.