| ZHANG Jia-bo， ZHENG Long-xi， LU Jie， PENG Chen-xu， LUO Zhen-kun.Numerical Simulation of Detonation Initiation in Sector Pulse Detonation Combustor[J].航空发动机,2024,50(3):53-57 |
| Numerical Simulation of Detonation Initiation in Sector Pulse Detonation Combustor |
| DOI： |
| Key Words:sector pulse detonation combustor deflagration to detonation transition obstacle blockage ratio numerical simula⁃
tion aeroengine |
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| Abstract:In order to investigate the influence of different obstacle structures on the initiation process of a sector pulse detonation
combustor， numerical simulations of the initiation processes in the middle cross-section of the sector pulse detonation combustor with
three types of typical orifice plate obstacles were carried out， and the influences of the type， blockage ratio， and spacing of the obstacles
on the deflagration to detonation transition （DDT） distance of the sector pulse detonation combustor were studied. The results show that the
obstruction blockage ratio has the greatest influence on DDT distance， and the higher the blockage ratio， the shorter the DDT distance
within the blockage ratio range of 0.35~0.70. Among the three types of obstacles， the obstacles with a swept-forward triangle section have
the best effect on shortening DDT distance at a low blockage ratio and those with a swept-back triangle section have the best effect on
shortening DDT distance in the case of high blockage ratio. Among the three spacings， the DDT distances have little difference when the
obstacle spacings are 1 and 1.2 times the equivalent diameter of the detonation combustor， and both of them are shorter than the DDT
distance when the obstacle spacing is 0.8 times the equivalent diameter of detonation combustor. |
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