Effects of Chevron nozzles on engine performance and jet noise of a turbojet engine and test environment

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  • シェブロンノズルがターボジェットエンジンの性能・ジェット騒音に及ぼす影響と試験環境について

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<p>This paper describes a research on a jet noise reduction device, a chevron nozzle. Chevron nozzles reduce the jet noise by an effect of promoting the mixing of high velocity jet and external flow. However, they tend to cause a thrust loss at the same time. In this research, experiments have been conducted using a small turbojet engine to evaluate the effect of chevron nozzles on the engine performance from both aspects of jet noise and thrust. In the previous research, it was pointed out that the test environment is not suitable for capturing the effect of chevron nozzles. In this research, the test environment has been changed from indoor to outdoor in response to the point. A test has been performed using TYPEIand TYPEII chevron nozzles, and the test results of indoor and outdoor for engine performance and jet noise have been compared. The results of comparison have been reported in the present paper.</p>

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