Time-resolved spectroscopy in the shock layer of a blunt body placed in an expansion tube flow

Djameel Ramjaun; Akihiro Sasoh; Yasuyuki Ohnishi; Kazuyoshi Takayama

doi:10.1117/12.424337

17 April 2001 Time-resolved spectroscopy in the shock layer of a blunt body placed in an expansion tube flow

Djameel Ramjaun, Akihiro Sasoh, Yasuyuki Ohnishi, Kazuyoshi Takayama

Proceedings Volume 4183, 24th International Congress on High-Speed Photography and Photonics; (2001) https://doi.org/10.1117/12.424337
Event: 24th International Congress on High-Speed Photography and Photonics, 2000, Sendai, Japan

Abstract

In the Shock Wave Research Center, Institute of Fluid Science, Tohoku University, a streak camera system has been used to study high-speed phenomena associated with hypervelocity flow conditions. In the different facilities available, including the expansion tube, different test conditions can be produced for the study of the shock layer around bodies. In certain extreme conditions, the flow is in non-equilibrium and the radiation inside the shock layer is strong enough to be measured by existing spectroscopic techniques. Analysis of the spectra can provide information on the properties of the gas and can be used to validate numerical models. In the present study, time-resolved spectroscopy has been carried out in order to investigate the useful test time of the expansion tube, a very important parameter in the process of calibration of this facility. A spectroscopic system consisting of an Action Research spectrograph of 500 mm focal length, a streak unit (Hamamatsu Photonics) and a CCD camera has been used to measure time-resolved spectra down to microsecond time scales. The system is also equipped with a lens-coupled intensifier of high dynamic range.

Citation Download Citation

Djameel Ramjaun, Akihiro Sasoh, Yasuyuki Ohnishi, and Kazuyoshi Takayama "Time-resolved spectroscopy in the shock layer of a blunt body placed in an expansion tube flow", Proc. SPIE 4183, 24th International Congress on High-Speed Photography and Photonics, (17 April 2001); https://doi.org/10.1117/12.424337

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