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Journal of Projectiles, Rockets, Missiles and Guidance >

2025 , Vol. 45 >Issue 2: 232 - 240

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2025.02.014

Effect of Working Time of Gas Generator on Internal Ballistic Characteristics of Cold Launch

  • SUN Dongrui ,
  • ZHENG Jian ,
  • ZHANG Zhixuan
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  • School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

Received date: 2024-10-15

  Online published: 2025-05-15

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Abstract

Cold launching of rocket is a kind of launching method by means of the gas generator in the launching tube to catapult the rocket out of the launching tube, and then ignite the main engine after the projectile body leaves the tube. In order to ensure that the rocket can get enough muzzle velocity at the end of the cold launching process, a structure of the cold launcher is designed and improved, and the internal ballistic characteristics during the launching process are studied, then a two-dimensional axisymmetric model of rocket cold launcher is established. It adopts layer spread dynamic grid technology and fluid control equation to numerically simulate the internal flow field of the launcher under the same propellant quantity and different working time, and obtain the pressure inside the launcher and the motion characteristic curves of the projectile body under different working conditions. The simulation results show that under the condition of the same mass of the propellant column, the increase of the working time of the gas generator will lead to the extension of the rocket discharge time and the decrease of the discharge speed, but it will also reduce the peak pressure and acceleration in the launching tube, the rate of change in the acceleration of the rocket is more stable, and the rocket overload will be reduced during the launching process.

Key words： rocket cooled launch; analysis of internal ballistic characteristics; layer-spread grid; numerical simulation; gas generator working time

Cite this article

SUN Dongrui , ZHENG Jian , ZHANG Zhixuan . Effect of Working Time of Gas Generator on Internal Ballistic Characteristics of Cold Launch[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2025 , 45(2) : 232 -240 . DOI: 10.15892/j.cnki.djzdxb.2025.02.014

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