A brief review is made of the various applications for the gas turbine. A discussion is presented which indicates the cause of the intake and exhaust noise. Equations are given which will allow calculations of the noise for a large range of gas-turbine-engine sizes. Other acoustical data are presented which provide the design engineer with a method to evaluate specific gas-turbine noise problems. General information is given on the selection of silencers and enclosures for reduction of noise to appropriate design goals. A typical example of a gas-turbine noise problem is detailed.

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