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Influencing factors for self-sustained combustion of solid fuel ramjet

GONG Lunkun, CHEN Xiong, LI Weixuan, YANG Haitao, ZHOU Changsheng   

  1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • Received:2016-09-28 Revised:2016-10-25 Online:2017-07-15 Published:2016-12-13
  • Supported by:

    General Armaments Department Pre-research Foundation (404040301)

Abstract:

By simulation and test, the parameters which influence the self-sustained combustion of the solid fuel ramjet (SFRJ) are investigated. The results show that the combustion in SFRJ is diffusion-controlled, and the ratio of characteristic chemical reaction time to characteristic residence time is the critical parameter influencing the self-sustained combustion of ramjet. The smaller the ratio is, the more stable the flame will be. Under the conditions of the present research, a small step height can guarantee the self-sustained combustion of ramjet. The physical reason for the stabilization of combustion behind a backward-facing step is that existence of a low speed flow area near the solid fuel surface guarantees the pyrolysis and combustion of the solid fuel. When the step height is 0, the flame will go out as the ratio of characteristic chemical reaction time to characteristic residence time increases quickly. When the step height is small, the ignition process may have influence on stable combustion of the SFRJ, and reburning may occur after flameout.

Key words: ramjet, solid fuel, self-sustained combustion, backward-facing step, direct-connect test, numerical simulation

CLC Number: