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推力是固体火箭发动机的重要性能指标,采用增加装药的传统办法可以提高推力,同时也带来强度要求的提高和成本的增加。为了在不增加装药的前提下,提高固体火箭发动机的推力,从固体火箭发动机结构设计的角度,提出调整火箭喷管间排布距离的方法。通过建立双喷管固体火箭发动机三维模型,利用AUSM格式,数值求解雷诺平均N-S方程,模拟双喷管不同排布间距下的喷管及射流的流场,得出各条件下推力。仿真结果表明,针对双喷管固体火箭发动机,调整喷管间距可以提高喷管推力。
Thrust is an important performance indicator of a solid rocket motor. The traditional method of increasing the charge can increase the thrust force, as well as increase the strength requirement and increase the cost. In order to improve the thrust of the solid rocket motor without increasing the charge, a method of adjusting the arrangement distance between rocket nozzles is proposed from the perspective of the structural design of the solid rocket motor. The three-dimensional model of a solid twin-nozzle rocket motor was established. The AUSM scheme was used to solve the Reynolds-averaged Navier-Stokes equations. The flow field of the nozzle and jet was simulated under different nozzle spacings. The thrust under each condition was obtained. The simulation results show that the nozzle thrust can be improved by adjusting the nozzle spacing for the dual nozzle solid rocket motor.