Raman spectroscopy of hypersonic shock waves

被引:32
作者
Ramos, A [1 ]
Maté, B [1 ]
Tejeda, G [1 ]
Fernández, JM [1 ]
Montero, S [1 ]
机构
[1] Consejo Super Invest Cient, Inst Estructura Mat, Madrid 28006, Spain
来源
PHYSICAL REVIEW E | 2000年 / 62卷 / 04期
关键词
D O I
10.1103/PhysRevE.62.4940
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Raman spectroscopy is shown to be an efficient diagnostic methodology for the study of hypersonic shock waves. As a test, absolute density and rotational population profiles have been measured across five representative normal shock waves of N-2 generated in a free jet, spanning the Mach number range 7.7<M<15.3. The interconversion of three differentiated populations (cold, scattered, and rethermalized molecules) across these shock waves shows a largely bimodal rotational distribution function with additional contribution of scattered molecules, in close analogy with the velocity distribution function known from helium shock waves [G. Pham-Van-Diep er at, Science 245, 624 (1989)]. Quantitative data on invariance trends of density profiles and properties of the wake beyond the shock waves are reported.
引用
收藏
页码:4940 / 4945
页数:6
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