Tunnel background noise on compressible convex-corner flows

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The perforated test section walls of a transonic wind tunnel are responsible for generating edgetones, thus contributing significantly to the overall noise level and possibly invalidating the measurements of surface pressure fluctuations. In the present study, the wind tunnel was assembled with perforated top/bottom walls, solid side walls, and four perforated walls. The focus was to investigate the effects of tunnel background noise on compressible convexcorner flows, which correspond to the upper control surface of an aircraft wing. External acoustic disturbance has a minor effect on the mean surface pressure distributions, including flow expansion and recompression near the corner. Higher peak pressure fluctuations, which are associated with shock excursion phenomena, are observed with more intense tunnel background noise, particularly for the flow with initial separated boundary layers.

Original languageEnglish
Pages (from-to)1011-1015
Number of pages5
JournalJournal of Aircraft
Volume50
Issue number4
DOIs
Publication statusPublished - 2013 Jul 1

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Wind tunnels
Tunnels
Control surfaces
Compressible flow
Pressure distribution
Boundary layers
Acoustics

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Cite this

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abstract = "The perforated test section walls of a transonic wind tunnel are responsible for generating edgetones, thus contributing significantly to the overall noise level and possibly invalidating the measurements of surface pressure fluctuations. In the present study, the wind tunnel was assembled with perforated top/bottom walls, solid side walls, and four perforated walls. The focus was to investigate the effects of tunnel background noise on compressible convexcorner flows, which correspond to the upper control surface of an aircraft wing. External acoustic disturbance has a minor effect on the mean surface pressure distributions, including flow expansion and recompression near the corner. Higher peak pressure fluctuations, which are associated with shock excursion phenomena, are observed with more intense tunnel background noise, particularly for the flow with initial separated boundary layers.",
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Tunnel background noise on compressible convex-corner flows. / Chung, Kung-Ming; Chang, Po Hsiung; Chang, Keh-Chin.

In: Journal of Aircraft, Vol. 50, No. 4, 01.07.2013, p. 1011-1015.

Research output: Contribution to journalArticle

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