横向过载下锥孔三维药柱的内弹道特性

The occurrence of internal ballistic anomalies during high-altitude missile maneuvering can result in flight mission failures. To analyze the abnormal mechanism of internal ballistics, the internal ballistics characteristics of motor under lateral overload were studied. Experimental measurements of the burning rate of HTPB ternary propellant under overload conditions were conducted, and a burning rate model of the propellant under overload was established. Based on this model, the non-uniform combustion surface retreat of cone-hole grain was simulated. The interior ballistic characteristics of cone-hole grain under three overload modes, namely, full lateral overload, short-time constant lateral overload, and short-time oscillation lateral overload, were studied. The results show that lateral overload increases the pressure in the combustion chamber and accelerates the exposure time of the insulation layer. The pressure oscillation frequency produced by oscillating overload is consistent with that of overload oscillation. Instantaneous lateral overload leads to a transitional increase in combustion chamber pressure. Under 100 g overload, the pressure increases by about 8%, the overload disappears, and the pressure plummets. When the lateral overload time interval is constant, stable pressure conditions are advantageous for missile maneuvering under overload conditions.