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Understanding and controlling jet noise at high temperature

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/32059

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Title: Understanding and controlling jet noise at high temperature
Creators: Stoughton, Sam J.
Advisor: Samimy, Mohammad
Issue Date: 2008-06
Abstract: Jet noise is a topic that has been heavily researched since the early 1950s. At the Gas Dynamics and Turbulence Lab (GDTL), located at the grounds of The Ohio State University’s Don Scott Airport, a large research effort is underway to understand the nature of jet noise and control and mitigate this jet noise using plasma actuators. The research is supported by NASA and the Air Force Office of Scientific Research. So far room temperature, Mach 0.9 jets have been successfully controlled using plasma actuators, but this is not an accurate model of commercial jet engine exhaust because in real applications the exhaust gas is heated in the combustion chamber within the engine. A facility to heat the jet flow has been developed to examine the differences between heated and unheated jet flows. The goal of the research presented here is to use the GDTL facility to obtain data for both heated and unheated jet flows. This data will be used to analyze differences in the jet flow as temperature is increased and this comparison will help to inform future attempts to control heated, Mach 0.9 jet flow. Schlieren photographs and acoustic data have been collected for a wide range of jet operating temperatures. This data yield preliminary conclusions on the differences between heated and unheated jet flow. Also the use of a boundary tripping device is explored to investigate its effect on the flow and the acoustics.
Embargo: No embargo
Series/Report no.: The Ohio State University. Department of Mechanical Engineering Honors Theses; 2008
Keywords: Aeroacoustics
Jet Exhaust
Airline Industry
Jet Engine
Sponsors: NASA
Air Force Office of Scientific Research
URI: http://hdl.handle.net/1811/32059
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