| 煤油液滴直径对两相旋转爆轰发动机流场的影响 |
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| 引用本文： | 杨帆,姜春雪,王宇辉,李世全,王健平,张国庆.煤油液滴直径对两相旋转爆轰发动机流场的影响[J].爆炸与冲击,2023,43(2):3-17. |
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| 作者姓名： | 杨帆 姜春雪 王宇辉 李世全 王健平 张国庆 |
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| 作者单位： | 1.北京化工大学机电工程学院，北京 100029 |
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| 基金项目： | 国家自然科学基金（52076003）；中央高校基本科研业务费专项资金（buctrc201913） |
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| 摘 要： | 为探究煤油液滴不同初始直径对气液两相旋转爆轰发动机流场的影响，假设初始注入的煤油液滴具有均匀直径，考虑雾化破碎、蒸发等过程，建立了非定常两相爆轰的Eulerian-Lagrangian模型，进行了液态煤油/高温空气爆轰的非预混二维数值模拟。结果表明：在初始液滴直径为1～70μm的工况范围，燃烧室内均形成了单个稳定传播的旋转爆轰波；全局当量比为1时，爆轰波前的空气区域大于液滴煤油的蒸气区域，导致波前燃料空气混合不均匀，波前均存在富油区和贫油区，两相速度差导致分离出的空气形成低温条带；当煤油液滴的初始直径较小时，波前的反应物混合过程主要受蒸发的影响，爆轰波可稳定传播；当直径减小至1μm时，煤油液滴在入口处即蒸发，旋转爆轰波表现为气相传播的特性，爆轰波结构平整；当煤油液滴的初始直径较大时，波前的反应物混合过程主要受液滴破碎的影响；对于相同的燃料质量流量，在不同初始煤油液滴直径工况下，煤油液滴最大的停留时间均占爆轰波传播时间尺度的80%以上；爆轰波前燃料预蒸发为气相的占比越高，爆轰波的传播速度越高；初始液滴直径为10～70μm的工况范围内，爆轰波的速度随初始直径的增大先升高后降低。
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| 关 键 词： | 旋转爆轰发动机 气液两相流 燃烧 液滴直径 |
| 收稿时间： | 2022-02-25 |
Influence of kerosene droplet diameters on the flow field of a two-phase rotating detonation engine |
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| Affiliation: | 1.College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China2.College of Engineering, Peking University, Beijing 100871, China3.School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | To investigate the influence of the initial droplet diameter on the flow field of gas-liquid two-phase rotating detonation engine, an Eulerian-Lagrangian model of unsteady two-phase detonation is established based on the assumption of an initially uniform droplet diameter and considering atomization and evaporation processes. Non-premixed two-dimensional numerical simulations of detonation for liquid kerosene and high temperature air mixture are conducted. The results show that a single stable rotating detonation wave is formed in the initial droplet diameter range of 1–70 μm. For the global equivalent ratio of 1, the air area before the detonation wave front is larger than the vapor area of kerosene droplets, resulting in inhomogeneous mixing before the wave front. Both oil-rich and oil-poor areas form before the wave front. Due to the speed difference between two phases of the gas and droplets, the air is separated to form a low-temperature strip. When the initial diameter of kerosene droplets is small, the mixing process of reactants is mainly affected by evaporation and the detonation wave propagates stably. When the initial droplet diameter is reduced to 1 μm, evaporation occurs at the entrance, and the rotating detonation flow field shows the characteristics of gas phase propagation, and the structure of the detonation wave is smooth. When the initial diameter of kerosene droplets is relatively large, the mixing process of reactants before the wave front is mainly affected by droplet break-up. For the same fuel mass flow rate with different initial droplet diameters, the maximum residence time of kerosene droplets accounts for more than 80% of the detonation wave propagation time and the detonation velocity increases with the increased ratio of gaseous part of the fuel. The velocity of the detonation wave increases first and then decreases with the increased initial droplet diameter in the range of 10–70 μm. |
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