Development of probes to measure in-duct sound pressure levels of a gas turbine exhaust
Keywords:Acoustic wave velocity, Gas turbines, Microphones, Probes, Turbulent flow, In duct sound pressure levels, In situ silencer insertion loss measurements
AbstractThe ability to measure in-duct sound power levels at the exhaust flange of a gas turbine allows in situ verification of gas turbine exhaust sound power levels and verification of silencer dynamic insertion loss. The primary requirement for a measurement of sound power level is a procedure that will measure valid sound pressure levels in a high velocity, hot gas, highly turbulent turbine exhaust flow. This paper describes the current state of the development of two specialized wall mounted microphone probes: a perpendicular tube and a slit tube.
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