侧喷管脉冲发动机内流场数值模拟

为研究侧喷管脉冲发动机的性能,运用流体计算软件对作为制导弹药推力矢量控制系统执行结构的侧喷管脉冲发动机内的三维流场进行数值模拟,分析了偏心段偏心距离、喷管至偏心段距离、偏心段长度对发动机流场结构和发动机性能参数的影响。研究结果表明:随着脉冲发动机偏心段向上移动,其径向推力减小,推力中心由喷管中心内侧向外侧移动;随着喷管至偏心段距离的增加,径向推力先增大、后减小,推力中心发生阶跃性的变化;受发动机结构的限制,偏心段长度对发动机性能的影响较小;采用的数值模拟方法可以用于侧喷脉冲发动机流场及性能预示计算。

Numerical Analysis of Internal Flow Field in Side Nozzle Pulse Motor

Side-nozzle pulse motors as the executive mechanisms of guided ammunition’s thrust vector control system are smart solid propellant rocket motor. To study the characteristics of motors, fluid calculation software was deployed to carry out simulation analysis on the 3D internal flow field. The effects of the eccentric distance of eccentric segment,the height between nozzle and the eccentric segment and the length of eccentric segment on the flow field structure and performance of engine were studied. Results show that the radial thrust decreases with the increase of the eccentric distance of eccentric segment,and the center of the radial thrust moves from the inside to the outside of the nozzle;the radial thrust increases first and then decreases with the increase of the height between nozzle and the eccentric segment,and the center of radial thrust varies sharply;due to the limitations of engine structure,the length of the eccentric section has less effect on the engine. The methods used can be used to simulate the integrated flow field and estimate the performance of engine.