Development of probes to measure in-duct sound pressure levels of a gas turbine exhaust

Mal P. Sacks, John Buttell


The 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.


Acoustic wave velocity; Gas turbines; Microphones; Probes; Turbulent flow; In duct sound pressure levels; In situ silencer insertion loss measurements

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