High bandwidth stagnation temperature measurements in a Mach 6 gun tunnel flow

Buttsworth, David R. and Jones, Terry V. (2003) High bandwidth stagnation temperature measurements in a Mach 6 gun tunnel flow. Experimental Thermal and Fluid Science, 27 (2). pp. 177-186. ISSN 0894-1777

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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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 11 Oct 2007 01:17
Last Modified: 02 Jul 2013 22:48
Uncontrolled Keywords: temperature; high speed flow experiments; stagnation temperature measurements; Mach 6 carbon dioxide flow; Oxford University Gun Tunnel
Fields of Research : 09 Engineering > 0915 Interdisciplinary Engineering > 091508 Turbulent Flows
09 Engineering > 0913 Mechanical Engineering > 091399 Mechanical Engineering not elsewhere classified
09 Engineering > 0915 Interdisciplinary Engineering > 091505 Heat and Mass Transfer Operations
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: 10.1016/S0894-1777(02)00281-9
URI: http://eprints.usq.edu.au/id/eprint/2942

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