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Title: Effects of wall temperature on boundary layer stability over a blunt cone at Mach 7.99
Author: Liang X(梁贤); Li XL(李新亮); Fu DX(傅德薰); Ma YW(马延文)
Source: Computers & Fluids
Issued Date: 2010
Volume: 39, Issue:2, Pages:359–371
Abstract: Effects of wall temperature on stabilities of hypersonic boundary layer over a 7-degree half-cone-angle blunt cone are studied by using both direct numerical simulation (DNS) and linear stability theory (LST) analysis. Four isothermal wall cases with Tw/T0= 0.5, 0.7, 0.8 and 0.9, as well as an adiabatic wall case are considered. Results of both DNS and LST indicate that wall temperature has significant effects on the growth of disturbance waves. Cooling the surface accelerates unstable Mack II mode waves and decelerates the first mode (Tollmien–Schlichting mode) waves. LST results show that growth rate of the most unstable Mack II mode waves for the cases of cold wall Tw/T0=0.5 and 0.7 are about 45% and 25% larger than that for the adiabatic wall, respectively. Numerical results show that surface cooling modifies the profiles of rdut/dyn and temperature in the boundary layers, and thus changes the stability haracteristic of the boundary layers, and then effects on the growth of unstable waves. The results of DNS indicate that the disturbances with the frequency range from about 119.4 to 179.1 kHz, including the most unstable Mack modes, produce strong mode competition in the downstream region from about 11 to 100 nose radii. And adiabatic wall enhances the amplitudes of disturbance according to the results of DNS, although the LST indicates that the growth rate of the disturbance of cold wall is larger. That because the growth of the disturbance does not only depend on the development of the second unstable mode.
Language: 英语
Indexed Type: SCI
Corresponding Author: 梁贤,李新亮
Correspondent Email: liangx_yan@126.com; lixl@imech.ac.cn
DOI: 10.1016/j.compfluid.2009.09.015
DOC Type: Article
WOS Subject: Computer Science, Interdisciplinary Applications ; Mechanics
WOS Subject Extended: Computer Science ; Mechanics
WOS Keyword Plus: DIRECT NUMERICAL-SIMULATION ; STREAM DISTURBANCE WAVES ; FLAT-PLATE ; HYPERSONIC FLOW ; RECEPTIVITY ; TRANSITION
WOS ID: WOS:000272404900016
ISSN: 0045-7930
Subject: 流体力学 ; 流体力学::流动的稳定性 ; 流体力学::湍流 ; 流体力学::计算流体力学
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Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/28800
Appears in Collections:非线性力学国家重点实验室_期刊论文

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