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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2017, Vol. 38 ›› Issue (4): 120409-120409.doi: 10.7527/S1000-6893.2016.0212

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Numerical simulation of the ignition transient of dual pulse motor based on multi-physics coupling

LI Yingkun1, HAN Junli1,2, CHEN Xiong1, ZHOU Changsheng1, GONG Lunkun1   

  1. 1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
    2. Beijing Institute of Electromechanical Technology, Beijing 100083, China
  • Received:2016-05-09 Revised:2016-07-17 Online:2017-04-15 Published:2016-08-01
  • Supported by:

    The Research Innovation Program for College Academic Graduates of Jiangsu Province (KYZZ15_0113)

Abstract:

In order to study the second pulse ignition transient of a dual pulse solid rocket motor, a multi-physic solver is developed. The governing equations for unsteady compressible fluid flow are solved with dual time LU-SGS (lower upper symmetric Guass seidel) iterative algorithm by finite volume method. The conjugate heat transfer strategy is employed to calculate the propellant surface temperature. A finite element method is used to discretize the structural dynamic equation in space, whereas the temporal time integration is achieved with the classic Newmark algorithm. A loosely coupled algorithm is used for fluid structure interaction problems, and the reliability of the numerical approach is validated by a comparison with experimental cases. Results show that the multi-physics solver can simulate the impact of ignition gas, strong unsteady flow, and mechanical response of metal diaphragm. The burst time and burst pressure of metal diaphragm can be also acquired. Meanwhile, with the increase of the ignition mass flow rate, the first ignition time of propellant and the burst time of the diaphragm become shorter and the burst pressure of the diagram decreases. The burst time and burst pressure of metal diaphragm are not only related to the pressure load on the surface of diaphragm, but also to the history of the pressure load on it. With the decrease of thickness of metal diaphragm, the burst time of the diaphragm goes shorter, the burst pressure of diaphragm decreases, and the maximum horizontal displacement of the diaphragm increases.

Key words: multi-physics coupling, fluid structure interaction, conjugate heat transfer, ignition, dual pulse motor, solid rocket motor, numerical simulation

CLC Number: