Numerical simulations of flow field of rotating detonation engine fueled by kerosene
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摘要:
为了深入研究气液两相旋转爆轰发动机的流场结构,建立了非定常两相爆轰的Eulerian⁃Lagrangian模型,使用SST(shear⁃stress transport)
k⁃ω 模型,采用一步反应机理的化学反应模型,进行了煤油/空气非预混的二维数值模拟。结果表明,采用30 μm粒径的液滴颗粒,在来流总温1 000 K的空气流中,液滴经历雾化破碎、蒸发、混合过程,在当量比0.70~1.15范围,形成稳定单个旋转爆轰波;煤油液滴被爆轰波扫过后未完全燃烧,部分煤油组分混杂在高温产物中沿下游排出;在燃烧室入口处,爆轰波前形成的空气三角形区域面积大于液滴颗粒三角形区域。Abstract:In order to study the flow field of gas⁃liquid two⁃phase rotating detonation engine,a Eulerian⁃Lagrangian model of unsteady two⁃phase detonation was established.Using the SST (shear stress transport)
k⁃ω model and the chemical reaction model based on the one⁃step reaction mechanism,the two⁃dimensional non⁃premixed numerical simulations of kerosene and air rotating detonation engines were carried out.The results showed that the droplet particles of 30 μm were atomized,broken,evaporated and mixed in the air flow at the total inlet temperature of 1 000 K,and a stable single rotating detonation wave was formed within the equivalence ratio range of 0.70 to 1.15.The kerosene droplets were not completely burned by the detonation wave,and a part of the kerosene was mixed in the high temperature products and discharged downstream.Near the inlet of combustion chamber,the air triangle formed in front of the detonation wave was larger than the droplet triangle.-
Key words:
- rotating detonation engine /
- gas⁃liquid two⁃phase flow /
- combustion /
- equivalence ratio /
- propulsion
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表 1 计算反应速率所用常数
Table 1. Constant used to calculate the reaction rate
A/109 b E/108 (J/kmol) 2.587 0 1.256 8.314 表 2 不同网格尺寸计算所得的爆轰波平均速度和温度
Table 2. Average velocity and temperature of detonation wave calculated by different cell sizes
网格单元尺寸/mm 波速/(m/s) 温度/K 0.20 1 170 2 509 0.25 1 160 2 500 0.40 1 200 2 543 0.50 1 240 2 482 表 3 不同工况的ωϕ
Table 3. ωϕ under different conditions
当量比 0.70 0.85 1.00 1.15 wϕ 0.046 0.055 0.064 0.073 -
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