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Dynamic Acoustic Detection of Boundary Layer transitionThe wind tunnel investigation into the acoustic nature of boundary layer transition using miniature microphones. This research is the groundwork for entry into the National Transonic Facility (NTF) at the NASA Langley Research Center (LaRC). Due to the extreme environmental conditions of NTF testing, low temperatures and high pressures, traditional boundary layer detection methods are not available. The emphasis of this project and further studies is acoustical sampling of a typical boundary layer and environmental durability of the miniature microphones. The research was conducted with the 14 by 22 Foot Subsonic Tunnel, concurrent with another wind tunnel test. Using the resources of LaRC, a full inquiry into the feasibility of using Knowles Electronics, Inc. EM-3086 microphones to detect the surface boundary layer, under differing conditions, was completed. This report shall discuss the difficulties encountered, product performance and observations, and future research adaptability of this method.
Document ID
19970003073
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Grohs, Jonathan R.
(Missouri Univ. Rolla, MO United States)
Date Acquired
August 17, 2013
Publication Date
January 1, 1995
Publication Information
Publication: Technical Reports: Langley Aerospace Research Summer Scholars
Volume: Part 1
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
97N11838
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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