Quiet wall jet facility for basic aero/hydroacoustics research

Richard Chostner Marboe, G. C. Lauchle, W. A IV Kargus

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

The design, performance, and research applications of a novel quiet air flow facility are described. This facility is an open-jet with a semi-circular orifice situated in a planar baffle. A flat plate which is typically 30.5 cm wide by 125 cm long inserts into the orifice 1.2 cm above the flat side forming a wall jet over the plate. For prevention of the formation of a jet free shear layer and control of corner vortex contamination, an acoustically transparent, but flow impermeable semi-circular mylar tube is placed over the plate. An acoustically and mechanically isolated 20 HP centrifugal blower, provides air which passes through a treated labyrinth and flexible hose to the settling chamber of the wall jet facility where turbulence management screens are located. The flat plate apparatus is inserted into a very large flow-through anechoic chamber which is described. Acoustic probes (both pressure and intensity) are moved robotically with a computer controlled scanner. With a rigid flat plate, measurements of the acoustic emissions from basic turbulent boundary layer flow structures are being performed. In another investigation, rearward facing steps and ramps of various heights and angles which promote natural flow separation are substituted. The direct acoustic radiation is measured along with wall pressure statistics and plate response.

Original languageEnglish (US)
Title of host publicationHydroacoustic Facilities, Instrumentation, and Experimental Techniques
PublisherPubl by ASME
Pages69-73
Number of pages5
Volume10
ISBN (Print)0791808807
StatePublished - 1991
EventWinter Annual Meeting of the American Society of Mechanical Engineers - Atlanta, GA, USA
Duration: Dec 1 1991Dec 6 1991

Other

OtherWinter Annual Meeting of the American Society of Mechanical Engineers
CityAtlanta, GA, USA
Period12/1/9112/6/91

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Acoustics and Ultrasonics

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