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- W1999888957 abstract "The acoustic environment in large enclosures with a small opening exposed to aerodynamic flow has been quantified. Theoretical/empirical techniques were developed for predicting the oscillatory frequencies, acoustic pressure level, spatial distribution of the acoustic pressures in the cavity, and the degree of alleviation achievable with suppressors. Experimental tests in a semifree jet facility were performed on scale models of large enclosures. The test Mach numbers ranged from 0.4 to 1.2. Levels as high as 184 dB were measured in the test enclosures. Acoustic resonant modes as high as 15 were observed. Numerous turbulence generating suppressors were evaluated. The results showed that size, location, and orientation had more influence on the effectiveness of the suppressors than the degree of turbulence generated. Suppressor optimization resulted in more than 30 dB of suppression for one configuration." @default.
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- W1999888957 date "1983-03-01" @default.
- W1999888957 modified "2023-09-27" @default.
- W1999888957 title "Acoustic environment in large enclosures with a small opening exposed to flow" @default.
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- W1999888957 doi "https://doi.org/10.2514/3.44860" @default.
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