Abstract
In this paper, focused laser differential interferometry (FLDI) is used to measure a well-characterized, 17 kHz screech tone emitted from an underexpanded Mach 1.5 jet. By utilizing the non-intrusive nature of FLDI, measurements are made at several points outside and within in the supersonic jet flowfield. Comparisons between FLDI data, and data obtained from microphones and high-speed schlieren are made. The agreement of each measurement respective to the other is used to demonstrate that FLDI is a valid and accurate technique for measuring screech tones in jet flowfields, and furthermore that FLDI may be used to measure jet screech at locations where traditional, intrusive diagnostics may not be used effectively.
| Original language | English |
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| Title of host publication | AIAA Scitech 2021 Forum |
| Publisher | American Institute of Aeronautics and Astronautics Inc, AIAA |
| Pages | 1-14 |
| Number of pages | 14 |
| ISBN (Print) | 9781624106095 |
| State | Published - 2021 |
| Externally published | Yes |
| Event | AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021 - Virtual, Online Duration: Jan 11 2021 → Jan 15 2021 |
Publication series
| Name | AIAA Scitech 2021 Forum |
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Conference
| Conference | AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021 |
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| City | Virtual, Online |
| Period | 01/11/21 → 01/15/21 |
Funding
The authors would like to acknowledge the Air Force Office of Scientific Research (AFOSR) and the Office of Naval Research (ONR) for funding some of the equipment used within this effort; the respective award numbers are FA9550-18-1-0485 (AFOSR) and N00014-18-1-2688 (ONR). The authors would also like to thank Kirk Davenport, James Chism, and Lauren Lester for their assistance in the execution of experiments as well as Gary Payne, Jack LeGeune, and Doug Warnberg for their assistance in the fabrication and construction of test models.