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| Wind Tunnel Test Research on Surface Pressure Fluctuations of a Blunt Cone |
| Received:February 04, 2021 Revised:February 16, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.03.008 |
| KeyWord:pressure fluctuations power spectral density wind tunnel test transition cone |
| Author | Institution |
| WANG Wen |
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang , China |
| JIANG Hua-bin |
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang , China |
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| Abstract: |
| Characteristics of surface pressure fluctuations for a blunt cone on sequent variable Reynolds numbers are analyzed in this study. A wind tunnel test with variable Reynolds numbers ranging from 4.5×107m‒1 to 1.0×107 m‒1 at Ma=6 and α=0° in FD-07 hypersonic wind tunnel. Detailed information of the characteristics of surface pressure fluctuations has been obtained in time domain and frequency domain, respectively. With the decrease of the Reynolds number, there exists a sudden reduction of the surface pressure fluctuations in time domain. The surface pressure fluctuations, which are normalized by the freestream dynamic pressure, reveals that the pressure fluctuations’ magnitude of transition is higher than that of turbulence or laminar. Moreover, from the perspective of frequency analysis (<10 kHz), the increase of the pressure fluctuation energy at 6 kHz occurs prior to that at the lower frequency range during transition. The PSD of pressure fluctuations during transition is higher than that of turbulence. The surface pressure fluctuation characteristics have been obtained with the variation of Reynolds numbers in time and frequency domain. With specific Mach numbers and angles of attack of the test, the normalized PSD of surface pressure fluctuations is independent of the Reynolds number. The PSD of surface pressure fluctuations, which are normalized by the freestream dynamic pressure during transition, is higher than that in turbulence. Its root mean square is two times than that in turbulence. More attentions should be paid to the transition in reentry when dealing with the reentry environment analysis or architectural design by the environment engineers and architectural designers. |
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