Instabilities on a Hypersonic Yawed Straight Cone

Abstract

Our current activities focus on providing linear and nonlinear parabolized stability equation analysis of the hypersonic crossflow and second-mode instability over a 7˚-halfangle yawed straight cone. A study is conducted to complement the experiments at Mach 6 in the Hypersonic Ludwieg Tube at Braunschweig 1 . Multiple instabilities can be simultaneously present in a 3-D boundary layer. For azimuthal angle 70° and x=0.36 m, analysis following Mack 2 suggests that the low-frequency disturbances observed are related to traveling crossflow. Simultaneously, a second mode is predicted with frequency range well predicted by LPSE.

Integrated Theoretical, Computational, and Experimental Studies for Transition Estimation and Control

“…Part 3: Instabilities on a 7º hypersonic yawed straight cone are concerned principally with crossflow instabilities and this work supports the nascent experimental work in the M6QT [127,132].…”

“…The are some nascent projects in the M6QT involving: (1) the 7º yawed straight cone for crossflow to go along with Reed's computations [127,132] NASA diamond ("pizza box") trips were used within a low-Reynolds-number boundary layer (Reθ = 3700), which allows for DNS computations. Hot-wire and Pitot pressure measurements were acquired.…”

Analysis of Windward Side Hypersonic Boundary Layer Transition on Blunted Cones at Angle of Attack

“…As has been noted in literature 18,19 the crossflow instability can be seeded even due to grid-to-grid roughness. This leads to distortion of the base state, and if the instability reaches an amplitude great enough to affect the stability analyses, may preclude meaningful results in the areas that are affected.…”

Analysis of the hypersonic cross-flow instability with experimental wavenumber distributions

“…The results of the wavelet analysis and previous studies show that, over the surface of a yawed cone, the stationary cross-flow vortices are not uniformly spaced azimuthally around the cone's surface (Perez, Reed & Kuehl 2013;Schuele et al 2013;Moyes et al 2017;Yates et al 2018Yates et al , 2019. Vortices tend to emanate near the attachment line on the windward ray of the cone and become unequally distributed moving towards the leeward ray.…”

“…The results of the wavelet analysis and previous studies show that, over the surface of a yawed cone, the stationary cross-flow vortices are not uniformly spaced azimuthally around the cone’s surface (Perez, Reed & Kuehl 2013; Schuele et al. 2013; Moyes et al.…”