Experiment And Simulation Of Pulse Separation Device Of Double Pulse Solid Rocket Motor

The pulse solid rocket motor with multiple ignition can increase the missile range,increase the terminal speed and improve the missile mobility,which plays an important role in improving the performance of the missile weapon system.Therefore,the design of an effective pulse separation device is an important factor to achieve pulse solid rocket motor.In this paper,a double-pulse solid rocket motor is studied as a background,and the development process of the solid rocket motor is illustrated.The design of the double-pulse solid rocket motor is completed through structural design,test verification and simulation optimization.The proposed pulse separation device with plug-in board and plug as the main structure is different from the traditional PSD,in which simple mechanical structure successfully achieves the separation of the combustion chamber of the motor.Second,the problem of high initial ignition pressure encountered in the first pulse ignition test of the motor was successfully solved.The main contents include the following aspects:1.The double-pulse solid rocket motor was designed with 30 Cr Mn Si A as the shell material.The double-base propellant was chosen as the first pulse and the composite propellant was used as second pulse.The nozzle assembly was designed and the throat was made of tungsten infiltration of copper.The high-silicon / phenolic resin is selected as the material of the thermal barrier.The PSD was designed,which was made of plugging board and plug.The plugging board was made of tungsten infiltrating copper,and the plug was intended to be made of engineering plastics.The PSD component realizes the separation of the combustion chamber of the motor with its simple structure.2.Through the hydraulic test and ignition test,POM was confirmed as the plug material.The verification of feasibility of PSD in motor was completed,which proves that PSD can withstand the pressure impact of 20 MPa at the beginning of first pulse ignition of motor and can be opened smoothly when working in second pulse combustion chamber.The opening pressure is about 0.3MPa,which will not affect the working process of the motor.The motor combustion chamber pressure test was completed,and the device used POM plug can withstand 37.7MPa impact pressure.The problem of higher pressure peak at the beginning of first pulse ignition is solved.It is found that the higher initial pressure peak of first pulse can be solved by reducing the grain of the combustion chamber to increase the ventilation area of the combustion chamber and coating the surface of the injection column to reduce the initial burning surface of the grain.3.Compared with the original structure,the optimal plugging structure weight is reduced by 300 g and the optimal structure limited pressure is 22.8MPa.The optimal structural parameters of the stepped plug are the large circle thickness L1 = 3,the step thickness d = 4,the small circle thickness L2 = 4,the limited pressure is 29.6MPa,and its structural performance is better than that of conical plug.The bursting pressure of plug calculated by simulation is less than 40% ～ 50% of the test plug bursting pressure,and multiplying the strength limit by an overall yield factor to improve the determination conditions can make the simulation of the burst pressure closer to the test results.The simulation result has higher safety factor,and the PSD structure calculated by the simulation greatly increases the working reliability of the PSD.