Spectral measurements of hypervelocity flow in an expansion tunnel
| Autor: | Chaokai Yuan, Zongmin Hu, K. Zhou, Yong Liu, Zonglin Jiang |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
020301 aerospace & aeronautics Electromagnetic spectrum Mechanical Engineering Expansion tunnel Computational Mechanics 02 engineering and technology Radiation 021001 nanoscience & nanotechnology Computational physics Shock (mechanics) Wavelength 0203 mechanical engineering Hypervelocity 0210 nano-technology Radiant intensity Spectrograph |
| Zdroj: | Acta Mechanica Sinica. 35:24-31 |
| ISSN: | 1614-3116 0567-7718 |
| Popis: | Atmospheric reentry vehicles and planetary probes fly through the atmosphere at hypervelocity speed. At such speed, there is a significant proportion of heat load to the vehicle surface due to radiative heating. Accurate prediction needs a good knowledge of the radiation spectrum properties. In this paper, a high-speed camera and spectrograph coupled to an intensified charge-coupled device have been implemented to investigate the radiation flow over a semi-cylinder model. The experiments were carried out in the JF16 expansion tunnel with secondary shock velocity of 7.9 km·s−1. Results show that the emission spectrum comprises several atomic lines and molecular band systems. We give detailed data of the radiation spectrum, shock shape, shock detached distance and radiation intensity varying with space and wavelength. This valuable experimental dataset will be helpful to validate computational fluid dynamics codes and radiation models, which equates to increased prediction accuracy of radiation heating. Also, some suggestions for spectral measurement in hypervelocity flow field were list in the end. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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