Article ID Journal Published Year Pages File Type
288281 Journal of Sound and Vibration 2013 11 Pages PDF
Abstract

Experiments are conducted to study the influence of surface roughness on the noise emitted from underexpanded pipe jets. Two sets of circular pipes of different orders of surface roughness are considered, and the pipe lengths are varied between 1 and 6 diameters. The blowdown studies are performed in the range of pressure ratios varying from 2 to 7. Acoustic measurements at various underexpansion levels indicate that although screech frequencies remain unaltered with surface roughness, the tonal sound pressure levels differ by almost 10 dB.

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Physical Sciences and Engineering Engineering Civil and Structural Engineering
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