两种化学激光器副喷管结构的数值模拟

J4 ›› 2013, Vol. 35 ›› Issue (4): 14-17.

两种化学激光器副喷管结构的数值模拟

肖楠,华卫红,刘文广

(国防科学技术大学光电科学与工程学院，湖南长沙 410073)

收稿日期:2012-04-22 修回日期:2013-02-27 出版日期:2013-04-25 发布日期:2013-04-25

Numerical study of two types of secondary nozzle in chemical laser

XIAO Nan,HUA Weihong,LIU Wenguang

(School of OptoElectronics Science and Engineering,National University of Defense Technology,Changsha 410073,China)

Received:2012-04-22 Revised:2013-02-27 Online:2013-04-25 Published:2013-04-25

摘要/Abstract

摘要：

化学激光器增益发生器的副喷管向光腔提供化学燃料和稀释气体，同时具有冷却主喷管气流的作用。喷管叶片内的多级分支流传输管道的优化设计对实现反应区流场均匀化有重要意义，同时可以提高副喷管气流对主喷管叶片的冷却能力。采用三维计算流体力学模型研究副喷管的工作特性，对比具有三级分支流传输结构的副喷管和2SLOT结构喷管，计算3 大气压、5大气压和8大气压入口压力下两种喷管的各级分支流出口的流场分布均匀性，发现当入口、出口面积比和喉道等参数一致时，多级分支流结构喷管明显比2SLOT喷管反应区流场的均匀性好；目前设计的三级分支流喷管结构的设计参数还有待优化；在现有参数条件下，提高入口压力有助于提高流场分布均匀性。

关键词: 化学激光器, 分流管道, 喷管

Abstract:

The second nozzle of the gain generator in the chemical laser provides optical cavity with chemical fuel and dilute gas, and refrigerates the main nozzle flow. Design optimization of several distribution flow pipeline levels in nozzle blade is vital for uniformization of reaction flow and cooling the nozzle blade by the secondary nozzle flow. Characteristics of the secondary nozzle were studied based on threedimensional fluid dynamics method. Nozzle with three distribution flow pipeline level transport structure and 2SLOT were compared. Flow field uniformity of every distribution flow pipeline levels were calculated under the 1st level inlet pressure of 3atm 5 atm and 8atm. The uniformity of the nozzle with three levels distribution flow pipeline structure is better than 2SLOT nozzle at the same parameters such as area ratio of input and output surfaces and throat. The parameters of existing design of three levels distribution flow pipeline nozzle structure requires further optimization. It is useful to obtain the uniformization of reaction flow with raising the inlet pressure.

Key words: chemical laser;distribution flow pipeline;nozzle

肖楠,华卫红,刘文广. 两种化学激光器副喷管结构的数值模拟[J]. J4, 2013, 35(4): 14-17.

XIAO Nan,HUA Weihong,LIU Wenguang. Numerical study of two types of secondary nozzle in chemical laser [J]. J4, 2013, 35(4): 14-17.