本文件已被宣布为“稳定”，不再接受货币定期审查。用户负责验证参考资料和持续适用性或技术要求。新技术可能存在。该文件提供了有关军用/商用/燃气轮机发动机测试单元/系统用户如何从这一独特的Coanda/概念中受益的信息。这些信息包含几个因素，这些因素被认为对理解概念的实际技术方面至关重要。这些是:a.运营需求；b、 概念界定；c、 发展计划；d.项目结果。介绍一种抑制燃气轮机发动机地面运行排气噪声的先进技术- 启动测试单元/系统。本文的讨论仅限于涡轮喷气发动机和涡扇发动机，尽管该概念同样适用于涡轮轴发动机和涡轮螺旋桨发动机。解释该技术在各种测试单元中的具体应用。

This document has been declared "Stabilized" and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability or technical requirements. New technology may exist.Document provides information on how military/commercial/gas turbine engine test cell/system users may benefit from this unique Coanda//refraction concept.The information contains several factors which are considered essential for understanding the practical technical aspects of the concept. These are: a. operation need; b. concept definition; c. developmental program; and d. program results.To present an advanced technology in suppression of gas turbine engine exhaust noise in ground run-up test cells/systems. The discussion herein is limited to turbojet and turbofan type engines, although the concept is equally applicable to turboshaft and turboprop types.To explain specific applications of this technique in various types of test cells.