Application of focused laser differential interferometer to hypersonic boundary-layer instability study
| Autor: | Tao Yu, Youde Xiong, Jie Wu, Jiaquan Zhao |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Hypersonic speed Aerospace Engineering 02 engineering and technology 01 natural sciences Instability 010305 fluids & plasmas symbols.namesake 020901 industrial engineering & automation 0103 physical sciences Focused laser differential interferometer Physics::Chemical Physics Motor vehicles. Aeronautics. Astronautics Wind tunnel Physics Focal point Mechanical Engineering TL1-4050 Laminar flow Mechanics Hypersonic boundary-layer instability Non-intrusive measurement Boundary layer Interferometry Wind tunnel experiment Mach number Physics::Space Physics Bicoherence analysis symbols |
| Zdroj: | Chinese Journal of Aeronautics, Vol 34, Iss 5, Pp 17-26 (2021) |
| ISSN: | 1000-9361 |
| DOI: | 10.1016/j.cja.2020.10.019 |
| Popis: | Accurate prediction of hypersonic boundary-layer transition plays an important role in thermal protection system design of hypersonic vehicles. Restricted by the capability of spatial diagnostics for hypersonic boundary-layer study, quite a lot of problems of hypersonic boundary-layer transition, such as nonlinearity and receptivity, remain outstanding. This work reports the application of focused laser differential interferometer to instability wave development across hypersonic boundary-layer on a flared cone model. To begin with, the focused laser differential interferometer is designed and set up in a Mach number 6 hypersonic quiet wind tunnel with the focal point in the laminar boundary-layer of a 5 degree half-angle flared cone model. Afterwards, instability experiments are carried out by traversing the focal point throughout the hypersonic boundary-layer and the density fluctuation along the boundary-layer profile is measured and analyzed. The results show that three types of instability waves ranging from 10 kHz to over 1 MHz are co-existing in the hypersonic boundary-layer, indicating the powerful capability of focused laser differential interferometer in dynamic response resolution for instability wave study in hypersonic flow regime; furthermore, quantitative analyses including spectra and bicoherence analysis of instability waves throughout the hypersonic boundary-layer for both cold and heated cone models are performed. |
| Databáze: | OpenAIRE |
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