Transition in Hypersonic Boundary Layers: Role of Dilatational Waves

Autor:	Zhang, Chuanhong, Zhu, Yiding, Yuan, Huijing, Wu, Jiezhi, Chen, Shiyi, Lee, Cunbiao, Gad-el-Hak, Mohamed
Rok vydání:	2015
Předmět:	Physics - Fluid Dynamics
Druh dokumentu:	Working Paper
Popis:	Transition and turbulence production in a hypersonic boundary layer is investigated in a Mach 6 quiet wind tunnel using Rayleigh-scattering visualization, fast-response pressure measurements, and particle image velocimetry. It is found that the second instability acoustic mode is the key modulator of the transition process. The second mode experiences a rapid growth and a very fast annihilation due to the effect of bulk viscosity. The second mode interacts strongly with the first vorticity mode to directly promote a fast growth of the latter and leads to immediate transition to turbulence. Comment: 5 pages, 6 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1501.06628 Zobrazit plný text záznamu View this record from Arxiv