NDLI: Effects of a modified leading edge on noise and boundary-layer transition in a rod-wall sound shield at mach 5

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Effects of a modified leading edge on noise and boundary-layer transition in a rod-wall sound shield at mach 5

Content Provider	NASA Technical Reports Server (NTRS)
Author	Beckwith, I. E. Creel Jr., T. R. Holley, B. B.
Copyright Year	1981
Description	A version of a rod wall sound shield was tested in the Mach 5 pilot quiet tunnel over a range of unit Reynolds numbers from 10 to 35 million per meter. The model was modified by inclining the leading edge plates to produce an initial 2 deg expansion to ascertain the sensitivity of boundary layer transition to leading edge disturbances. Rod surface pitot pressures, mean free stream pitot pressures, and static pressures on the rods and plenum walls were measured. Hot-wire measurements were also made in the model and nozzle free stream at a unit Reynolds number of 15 million per meter. The surface pitot pressures indicated that transition was much farther forward than for the previous tests due to the leading edge modification and minor fabrication flaws in the model. Early boundary layer transition on the rods was confirmed by hot-wire measurements which showed much higher noise levels in the free stream shield flow when compared with results from previous tests. Mean pitot pressure surveys within the shielded region inside the model indicated that there was an overexpansion and recompression that would limit the streamwise length of undisturbed flow to about 13 cm along the centerline.
File Size	2134342
Page Count	44
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19810013780
Archival Resource Key	ark:/13960/t77t2hp3j
Language	English
Publisher Date	1981-05-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Heat Transfer Noise Reduction Supersonic Wind Tunnels Wall Flow Wind Tunnel Tests Boundary Layer Transition Wind Tunnel Apparatus Pressure Measurement Leading Edges Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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