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讨论了双级延伸喷管的动特性，确定了贮气瓶内压强、放气时间与延伸喷管运动参数之间的关系，建立了通用的数学模型，为供气系统和延伸喷管各部件的设计提供了理论依据。
The dynamic characteristics of two-stage extension nozzle are discussed. The relationship between the pressure inside the gas cylinder and the deflation time and the parameters of the extension nozzle is determined. A general mathematic model is established for the gas supply system and the components of the extension nozzle The design provides a theoretical basis.