Abstract
This paper describes a research on the effect of chevron nozzles on turbo jet engine performance and jet noise. Although chevron nozzles reduce the jet noise by an effect of the mixing between high velocity jet and external flow, they tend to provide a thrust loss at the same time. In this research, the experiment has been conducted for several kinds of chevron nozzles installed on a small turbo jet engine, in order to evaluate both aspects of noise reduction and thrust loss. Four kinds of chevron shapes and two kinds of nozzle exit geometries have been used in the experiment and the obtained results have been compared with that of the reference nozzle.
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