Page 4 - 《爆炸与冲击》2023年第2期
P. 4
第 43 卷 第 2 期 爆 炸 与 冲 击 Vol. 43, No. 2
2023 年 2 月 EXPLOSION AND SHOCK WAVES Feb., 2023
DOI:10.11883/bzycj-2022-0068
煤油液滴直径对两相旋转爆轰发动机流场的影响 *
杨 帆 ,姜春雪 ,王宇辉 ,李世全 ,王健平 ,张国庆 3
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(1. 北京化工大学机电工程学院,北京 100029;
2. 北京大学工学院,北京 100871;
3. 北京理工大学宇航学院,北京 100081)
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 1~70 µm 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 1 µm 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 10~70 µm 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。
关键词: 旋转爆轰发动机;气液两相流;燃烧;液滴直径
中图分类号: O382; V231 国标学科代码: 13035 文献标志码: A
Influence of kerosene droplet diameters on the flow field of
a two-phase rotating detonation engine
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YANG Fan , JIANG Chunxue , WANG Yuhui , LI Shiquan , WANG Jianping , ZHANG Guoqing 3
(1. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2. College of Engineering, Peking University, Beijing 100871, China;
3. School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China)
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
* 收稿日期: 2022-02-25;修回日期: 2022-10-12
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)
第一作者: 杨 帆(1996- ),男,硕士研究生,yfhbxt@163.com
通信作者: 王宇辉(1986- ),男,副教授,aowuki@163.com
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