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Journal of Projectiles, Rockets, Missiles and Guidance >

2025 , Vol. 45 >Issue 2: 167 - 175

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2025.02.006

Dynamic Study on Eccentric Ejection of Multi-stage Piston Canister in Liquid Rocket

  • SONG Shize , 1 ,
  • JIANG Yi , 1 ,
  • ZHAO Yuanyang 2 ,
  • SHEN Bohan 1
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  • 1 School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
  • 2 Beijing Institute of Aerospace System Engineering, Beijing 100076, China

Received date: 2024-03-06

  Online published: 2025-05-15

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Abstract

Liquid propellant sloshing alters the rocket's center of mass and generates dynamic loads on storage tanks, adversely affecting launch stability and safety. Aiming at the coupling problem between attitude deviation and liquid sloshing during the multi-stage piston eccentric ejection process of liquid rockets, a fluid-structure interaction model of the liquid rocket and its launch system was established by using the finite element method and smooth particle hydrodynamics method (FEM-SPH). The entire eccentric ejection process of the liquid rocket was simulated and analyzed, and the influence of the number and spatial distribution of the liquid rocket adapter on the initial disturbance of the rocket, the force on the rocket tank and the force characteristics of the adapter itself was investigated. The results indicate that the eccentric ejection of a liquid rocket induces deviations in the rocket's yaw angle. During the ejection process, the lateral sloshing loads on the oxidizer tank exceed those on the fuel tank at the same stage, and the force variations on the first-stage adapter located in the upper section of the rocket are more pronounced. When the adapters are distributed in a sparse upper and dense lower configuration, the rocket's yaw angle and the force variation on the adapter are the largest. When the adapters are arranged in a dense upper and sparse lower configuration, the peak sloshing forces on all tanks are the highest. Increasing the adapter from four to six circles reduces the rocket ejection yaw angle by 26.9%, the peak value of lateral slosh force on each tank by an average of 24.1%, and the change in force on the first adapter by 34.6%.

Key words： liquid rocket; multi-stage piston cylinder ejection; SPH; adapter distribution

Cite this article

SONG Shize , JIANG Yi , ZHAO Yuanyang , SHEN Bohan . Dynamic Study on Eccentric Ejection of Multi-stage Piston Canister in Liquid Rocket[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2025 , 45(2) : 167 -175 . DOI: 10.15892/j.cnki.djzdxb.2025.02.006

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