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This paper presents the firing experimental results of muzzle flowfield and flash obtained by using indirect shadowgraphy and usual photography for these structures of flash suppressor of 12.7mm machine gun.It analyzes the influence of the structure model and parameters of suppressors on muzzle flowfield and flash,and deepens the research of the suppressing flash mechanism of flash suppressor and the techniques of increasing the effect of suppressing flash.It is found from experiments that strong secoudary flash...

This paper presents the firing experimental results of muzzle flowfield and flash obtained by using indirect shadowgraphy and usual photography for these structures of flash suppressor of 12.7mm machine gun.It analyzes the influence of the structure model and parameters of suppressors on muzzle flowfield and flash,and deepens the research of the suppressing flash mechanism of flash suppressor and the techniques of increasing the effect of suppressing flash.It is found from experiments that strong secoudary flash occurs occasionally at far distance from nuzzle for the flash suppressor with conical expansion section,this phenomenon could not be pertinently explained by the forming mechanism of muzzle flash.This paper makes initial analysis for the igniting mechanism of this type of secondary flash.

本文介绍了三种结构消焰器在12.7毫米机枪上作射击试验时,用间接阴影照相得到的膛口流场和膛口焰的实验结果.分析了消焰器结构形式、参数对膛口流场和膛口焰的影响,较深入地研究了消焰器的消焰机理和提高消焰效果的技术途径.试验中还发现带圆锥膨胀段的消焰器,有时在距膛口较远处会产生现有炮口焰形成机理不能很好解释的强烈的二次焰,本报告对这类二次焰的点燃机理作了初步分析.

It is shown that a field strength of-1.6 milligauss at the inner part of the to-roid around a young stellar object is enough to hold the lateral expansion of the stellar wind of Mw - 4 × 10-9M yr-1 and Fw - 300kms-1 at a distance smaller than 3 × 1015cm, as required by observations. Thus,the wind material has to turn its way to the vertical directions through a "magnetic de Laval nozzle". The thermal pressure of the jet is balanced by the external magnetic pressure, of the longitudinal field.The Kelvin-Helmholtz...

It is shown that a field strength of-1.6 milligauss at the inner part of the to-roid around a young stellar object is enough to hold the lateral expansion of the stellar wind of Mw - 4 × 10-9M yr-1 and Fw - 300kms-1 at a distance smaller than 3 × 1015cm, as required by observations. Thus,the wind material has to turn its way to the vertical directions through a "magnetic de Laval nozzle". The thermal pressure of the jet is balanced by the external magnetic pressure, of the longitudinal field.The Kelvin-Helmholtz instability of such an equilibrium state is investigated. A simple analytical method is developed for the resonant pinch modes. The properly scaled growth rates, wave numbers and phase speeds of the first ten resonant pinch modes are plotted against a single parameter, the ratio between the external Alfven speed and the internal sound speed. Many observational features, such as the knot space, the high proper motions, and the optical invisibility of the expansion part of the jet, can all be explained by this model.This is only a brief report. Detailed derivations and calculations will be published elsewhere.

本文用磁拉瓦尔管机制解释了双极喷流的形成。这样,喷流内部的热压力被外部纵向磁场的磁压所平衡。本文研究了这一平衡态基础上的Kelvin-Helmholtz不稳定性,得出了共振模式的分析解。这一族解可解释喷流块状结构的许多观测特点,如块状结构的间距。高本动速度及喷流膨胀段的光学不可见性等等。

The performance and construction of a magic hole sin-gle pulse shock tube and its measurement system are described.Thisfacility has been used in the studies of the chemical kinetic of TiCl_4 inour laboratory.The role of the magic hole is investigated and a simplemodel is put forward, i.e.,for the incident shock the operation of themagic hole is equivalent to an expansion section connected to the downstream of the diaphragm,in the other hand for the reflected shack themagic hole is operating as a flowing side...

The performance and construction of a magic hole sin-gle pulse shock tube and its measurement system are described.Thisfacility has been used in the studies of the chemical kinetic of TiCl_4 inour laboratory.The role of the magic hole is investigated and a simplemodel is put forward, i.e.,for the incident shock the operation of themagic hole is equivalent to an expansion section connected to the downstream of the diaphragm,in the other hand for the reflected shack themagic hole is operating as a flowing side branch.

本文叙述了力学所激波管实验室建造的魔洞型单脉冲激波管的结构尺寸,气动特性及测量系统,使用证明这套单脉冲激波管装置是成功的。本文提出了关于魔洞作用机制的一个简单模型:对入射激波而言,魔洞的作用相当于低压室入口处有一膨胀段;对反射激波而言,魔洞的作用相当于一个有流动的分叉管。

 
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