High bandwidth stagnation temperature measurements in a Mach 6 gun tunnel flow
Article
Article Title | High bandwidth stagnation temperature measurements in a Mach 6 gun tunnel flow |
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ERA Journal ID | 3669 |
Article Category | Article |
Authors | Buttsworth, David R. (Author) and Jones, Terry V. (Author) |
Journal Title | Experimental Thermal and Fluid Science |
Journal Citation | 27 (2), pp. 177-186 |
Number of Pages | 10 |
Year | 2003 |
Place of Publication | Philadelphia, PA. United States |
ISSN | 0894-1777 |
1879-2286 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/S0894-1777(02)00281-9 |
Web Address (URL) | http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V34-47RJSWH-7&_user=1472215&_coverDate=02%2F28%2F2003&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000052720&_version=1&_urlVersion=0&_userid=1472215&md5=01948036c8e1800a316b072036ab0e95 |
Abstract | Temperature is an important parameter in most high speed flow experiments, but it is sometimes a difficult parameter to measure, particularly in short-duration facilities. Stagnation temperature measurements have been obtained using transient thin film heat flux probes in a Mach 6 carbon dioxide flow produced by the Oxford University Gun Tunnel. The probes were operated over a range of surface temperatures so that the flow stagnation temperature could be identified independently of the convective heat transfer coefficient of the probes. The time-averaged measurements indicate a significant drop in stagnation temperature with time and this implies that significant cooling of the test gas occurred within the barrel during the compression process and/or during the flow discharge process. During the last 12 ms of flow, the time-averaged stagnation temperature indicated by the probe was 610+/-10 K for the present operating conditions. During the same 12 ms flow period, the probe measurements also indicate stagnation temperature fluctuations of about 2.3 K (rms) for frequencies between 1 and 25 kHz. Based on pitot pressure fluctuation measurements at essentially the same location within the nozzle, it is concluded that the measured temperature fluctuations are primarily due to fluctuations in entropy. Entropy fluctuations within the Mach 6 flow probably arise because of the turbulent heat transfer to the barrel. |
Keywords | temperature; high speed flow experiments; stagnation temperature measurements; Mach 6 carbon dioxide flow; Oxford University Gun Tunnel |
ANZSRC Field of Research 2020 | 401213. Turbulent flows |
401799. Mechanical engineering not elsewhere classified | |
401205. Experimental methods in fluid flow, heat and mass transfer | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | University of Oxford, United Kingdom |
https://research.usq.edu.au/item/9y504/high-bandwidth-stagnation-temperature-measurements-in-a-mach-6-gun-tunnel-flow
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