Simultaneous Infrared and Pressure Measurements of Crossflow Instability Modes for HIFiRE-5

Abstract

SAR 18. NUMBER OF PAGES 23 19a. NAME OF RESPONSIBLE PERSON (Monitor) a. REPORT

Controlled stationary/travelling cross-flow mode interaction in a Mach 6.0 boundary layer

“…This scenario would result in rapid spectral broadening that is associated with turbulent transition. It further points to a mechanism for the sensitivity of cross-flow transition to the level of free-stream disturbances that has been observed by others (Borg et al 2011(Borg et al , 2012(Borg et al , 2013(Borg et al , 2015Borg & Kimmel 2016).…”

“…Borg and colleagues (Borg, Kimmel & Stanfield 2011Borg et al 2015;Borg & Kimmel 2016) performed a series of experiments that focused on various elements of the transition process on a Hypersonic International Flight Research Experimentation (HIFiRE) program 2 : 1 elliptic cone which under 'quiet' flow conditions, exhibited travelling cross-flow waves. They particularly focused on the effect of free-stream disturbances.…”

Influence of Environmental Disturbances on Hypersonic Crossflow Instability on the HIFiRE-5 Elliptic Cone

“…Several ground based studies of the 2:1 elliptic cone geometry at Mach 6 have been conducted in support of these flight tests (Michael Holden and Timothy Wadhams and Matthew MacLean and Erik Mundy, 2009;Berger et al, 2009;Juliano & Schneider, 2010;Borg et al, 2012Borg et al, , 2013Borg & Kimmel, 2016;Juliano et al, 2016), and several CFD analyses have been performed (Choudhari et al, 2009;Li et al, 2012;Moyes et al, 2017;Paredes et al, 2016;Lakebrink et al, 2017). Choudhari et al (2009) presents the initial CFD analysis performed on this geometry in sup- The ground based campaigns of Juliano et al (2015) and Borg & Kimmel (2016) have examined a 38.1% scale model of the HF-5 geometry. Juliano et al (2015) performed a series of experiments using temperature sensitive paint to examine transition on the model surface.…”

“…Juliano et al (2015) performed a series of experiments using temperature sensitive paint to examine transition on the model surface. His has focused on the model attachment line and its sensitivity to roughness, the effect of freestream disturbances, stationary crossflow vortices, traveling crossflow waves, and angle of attack effects (Borg et al, 2011(Borg et al, , 2012(Borg et al, , 2013(Borg et al, , 2015aBorg & Kimmel, 2016). Borg et al's studies have seen evidence of dominant stationary crossflow under quiet flow with the accompanying presence of traveling crossflow waves (Borg et al, 2015b).…”

Boundary-Layer Transition Measurements in the Boeing/AFOSR Mach-6 Quiet Tunnel

“…1 PEEK has been used successfully in the BAM6QT for IR thermography of crossflow on an elliptic cone. 2 A specially-made calcium fluoride (CaF) window, provided by AFRL, was installed in the BAM6QT for IR optical access. This window is circular with a diameter of about 3 inches.…”