ESDU 75020
Estimation of far-field sound pressure levels due to buzz-saw noise of a supersonic fan or compressor.
Abstract:
ESDU 75020 provides both a graphical procedure and a computer program for estimating far-field sound pressure levels due to buzz-saw noise of a supersonic fan or compressor for a stationary engine. For a graphical procedure a set of curves is provided for components of the sound pressure level. The components evaluated are those depending on intake duct length/radius ratio, the Mach number of the flow incident to the blades, the observer's angular position and distance from the intake plane, and the shock-wave characteristics (for which guidance on appropriate values is also provided). Finally a set of curves defines the cut-off frequency below which tones do not propagate along the intake duct.
Two computer programs, known as ESDUpac A7520 and VIEWpac M7520, which use the same equations as the graphical procedure are provided. Another program, known as ESDUpac B7520 is also provided, can help the user create files containing input data.
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This Data Item is complemented by the following software:
| Name | Details | ||||
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ESDUpac A7520 |
This program is only available to subscribers. |
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ESDUpac B7520 |
This program is only available to subscribers. |
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M7520 |
This program is only available to subscribers. |