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Acta Armamentarii ›› 2023, Vol. 44 ›› Issue (7): 1896-1907.doi: 10.12382/bgxb.2022.0162

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Analysis of Interior Ballistic Characteristics of Conical Three-Dimensional Charge Column Under Lateral Overload

TIAN Zhongliang1, LI Junwei1,*(), HE Ye1, XU Tuanwei2, DING Miao2, WANG Ningfei1   

  1. 1 School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
    2 Science and Technology on Combustion, Internal Flow and Thermo-Structure Laboratory, The 41st Institute of the Fourth Academy of China Aerospace Science and Technology Corporation, Xi’an 710025, Shaanxi, China
  • Received:2022-03-15 Online:2023-07-30
  • Contact: LI Junwei

Abstract:

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 100g 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.

Key words: conical three-dimensional cylinder, burning rate, burning surface retreat, lateral overload, interior ballistics