国防科技大学学报Issue(6)：48-53,6.DOI:10.11887/j.cn.201506011
线性可调音速喷嘴工作特性仿真
Simulation on the performance of linear throttleable sonic nozzle
摘要
Abstract
The mode transition of combined-cycle engine makes it necessary to throttle the mass flow rate of propellants continuously and stably.Aiming at gaseous propellant,a throttleable sonic nozzle was designed on the basis of normal sonic nozzle.The throttleable sonic nozzle achieves continuous throttling through a plug moving along axis.By adopting the twice-envelope method,the contour of the plug was designed to satisfy the linear characteristic of mass flow rate.Performances of the throttleable sonic nozzle were investigated through the numerical simulation of computational fluid dynamics.It is found that the mass flow rate is independent under the back pressure when the back pressure is lower than the critical back pressure and the critical back pressure ratio increases as mass flow rate decreases.The linear relationship between mass flow rate of linear throttleable sonic nozzle and location of plug was verified and results show that the discharge coefficient is high and hardly be affected by the location of plug.关键词
可调音速喷嘴/线性/流量特性/流量调节/反压Key words
throttleable sonic nozzle/linear/flow characteristic/mass flow rate throttling/back pressure分类
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成鹏,李清廉,张新桥,康忠涛,陈慧源..线性可调音速喷嘴工作特性仿真[J].国防科技大学学报,2015,(6):48-53,6.基金项目
新世纪优秀人才支持计划资助项目 （）
