The Application of the Particle Element Method in Tubular Propellant Charge Structure: Lumped Element Method and Multiple-Element Method

Ruyi Tao, Shenshen Cheng (), Xinggan Lu, Shao Xue and Xiaoting Cui
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Ruyi Tao: School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Shenshen Cheng: School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Xinggan Lu: School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Shao Xue: Academy of Opto-ELectronics, China Electronics Technology Group Corporation, Tianjin 300220, China
Xiaoting Cui: School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Energies, 2024, vol. 17, issue 17, 1-18

Abstract: Due to the orderly arrangement of tubular propellant, the permeability of combustion gases is improved, which is beneficial for enhancing the safety of the combustion system. However, current internal ballistic gas-solid flow calculation methods adopt a quasi-fluid assumption, which cannot accurately account for the characteristics of long tube shapes. Additionally, tubular propellants exhibit both overall movement and parameter distribution characteristics, necessitating the decoupling of gas and solid phases. These two deficiencies in previous studies have limited the effectiveness of gas-solid flow simulations for tubular propellant. This paper proposes a numerical calculation model suitable for tubular propellant charging based on the particle element method for internal ballistic two-phase flow. Firstly, considering the overall movement characteristics of tubular propellants, the concept of blank particle elements is introduced to represent pure gas phase regions. Then, based on computational requirements, the tubular propellants are divided to form the lumped element method and the multiple-element method. The moving boundary method is used to calculate the movement process of the propellant bed particle group and is compared with experimental results to verify the applicability of the two methods in tubular propellant beds. Analysis results show that the particle element method can effectively capture changes in the flow field inside the chamber and the position of tubular propellants. The lumped element method can quickly obtain the flow field distribution characteristics inside the chamber, while the multiple-element method can capture parameter distribution characteristics at different positions of the tubular propellants while ensuring overall movement.

Keywords: gas-solid phase flow; internal ballistics; particle element method; numerical calculation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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