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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2019, Vol. 40 ›› Issue (5): 122591-122591.doi: 10.7527/S1000-6893.2018.22591

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Simulations of stable structure in oxy-hydrogen detonation propagation in square ducts using an improved CE/SE scheme

SHEN Yang1, LIU Kaixin1, CHEN Pu1, ZHANG Deliang2   

  1. 1. College of Engineering, Peking University, Beijing 100871, China;
    2. State Key Laboratory of High-Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2018-08-06 Revised:2018-09-17 Online:2019-05-15 Published:2018-11-16
  • Supported by:
    National Natural Science Foundation of China (10732010, 10972010)

Abstract: Using an improved space-time Conservation Element and Solution Element (CE/SE) scheme, the three-dimensional detonation propagation in square ducts filled with H2-O2 mixtures is simulated. A series of detonation structures under different cross-sectional sizes and two kinds of initial perturbation are calculated and analyzed. It costs relatively little computational resource to reproduce the three typical kinds of detonation propagation structure, namely the rectangular mode, the diagonal mode, and the spinning mode. As the cross-sectional size decreases, the detonation cellular pattern and the wave front structure will produce an adaptive deformation, until the number of cellular pattern decreases and some of the triple point lines disappear. Eventually, the rectangular mode and the diagonal mode will both transform into the clockwise or anticlockwise spinning mode. At the critical cross-sectional size, the new detonation structure and its maximum pressure histories during the transformation process are obtained, and the stability of the rectangular and diagonal propagation mode are preliminarily discussed.

Key words: detonation, CE/SE scheme, Sichel two-step model, cellular patterns, transition structure

CLC Number: