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Journal of Projectiles, Rockets, Missiles and Guidance >

2023 , Vol. 43 >Issue 2: 109 - 118

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2023.02.018

Study on Influence of Shell-charge Gap on Ignition Pressure-building Process of Free-loading Solid Rocket Motor

  • YAN Mi 1, 3 ,
  • MA Yu 2 ,
  • TIAN Xiaotao 1, 3 ,
  • JIA Shengxi 1, 3 ,
  • ZHANG Hao 1, 3
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  • 1 Xi’an Modern Control Technology Research Institute, Xi’an 710065, Shaanxi, China
  • 2 Xi’an Modern Chemistry Research Institute, Xi’an 710065, Shaanxi, China
  • 3 Laboratory of Modern Control Technology, Xi’an 710065, Shaanxi, China

Received date: 2022-10-29

  Online published: 2025-02-24

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Abstract

Based on the numerical simulation of internal flow field, the initial pressure build-up process of a typical free filled solid motor with coated grain is analyzed under different shell grain gap, and the influence law of shell grain gap on the pressure distribution and change of the initial pressure build-up process of the motor is obtained. Firstly, the distribution characteristics of internal flow field at different times in the process of engine pressure building are analyzed. Secondly, the initial pressure build-up process of the engine under a certain shell charge gap is analyzed. Through the analysis of the change of the pressure distribution of the combustion chamber with time under the working conditions of only ignition and ignition charge, the change of the pressure difference between different positions of the gap and the charge blind hole cavity with time is obtained. Finally, the effects of different shell propellant gaps on the initial pressure build-up process of the engine are analyzed. Through the analysis of the calculation results of the pressure build-up process of the combustion chamber under three shell propellant gaps, the effects of shell propellant gaps on the pressure balance time of the combustion chamber, the maximum ignition pressure difference and the secondary maximum pressure difference are obtained. The results show that during the initial pressure build-up of the engine, the total pressure balance time, the maximum ignition pressure difference and the secondary maximum pressure difference of the combustion chamber increase with the decrease of the assembly clearance.

Key words： free-loading; solid rocket motor; shell-charge gap; pressure-building process; numerical simulation

Cite this article

YAN Mi , MA Yu , TIAN Xiaotao , JIA Shengxi , ZHANG Hao . Study on Influence of Shell-charge Gap on Ignition Pressure-building Process of Free-loading Solid Rocket Motor[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2023 , 43(2) : 109 -118 . DOI: 10.15892/j.cnki.djzdxb.2023.02.018

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