Unexpected pressure rise may occur in the end-burning grain solid rocket motor. It is generally believed that this phenomenon is\ncaused by the nonparallel layer combustion of the burning surface, resulting in the increase of burning rate along the inhibitor. In\norder to explain the cause of this phenomenon, the experimental investigation on four different end configurations were carried out.\nBased on the X-ray real-time radiography (RTR) technique, a new method for determining the dynamic burning rate of propellant\nand obtaining the real-time end-burning profile was developed. From the real-time images of the burning surface, it is found that\nthere was a phenomenon of nonuniform burning surface displacement in the end-burning grain solid rocket motor. Through image\nprocessing, the real-time burning rate of grain center line and the real-time cone angle are obtained. Based on the analysis of the\nreal-time burning rate at different positions of the end surface, the end face cone burning process in the motor working process\nis obtained. The closer to the shell, the higher the burning rate of the propellant. Considering the actual structure of this endburning\ngrain motor, it is speculated that the main cause of the cone burning of the grain may be due to the heat conduction of\nthe metal wall. By adjusting the initial shape of the grain end surface, the operating pressure of the combustion chamber can be\nbasically unchanged, so as to meet the mission requirements. The results show that the method can measure the burning rate of\nsolid propellant in real time and provide support for the study of nonuniform combustion of solid propellant.
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