当量比对铝粉/空气旋转爆轰发动机流场影响的数值模拟
Numerical simulations on effect of equivalence ratio on flow field in aluminum power/air rotating detonation engines
李世全 1杨帆 1王宇辉 1王健平 2张国庆3
作者信息
- 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
- 折叠
摘要
以铝粉为燃料,空气为氧化剂,通过一步反应机理,对不同当量比下气固两相旋转爆轰发动机的流场进行二维数值模拟研究.结果表明:由于颗粒注入速度和空气注入速度存在差异,导致反应物区中的颗粒三角区和空气三角区不完全重叠,使得当量比从0.6增加到1.4时,爆轰波前的平均局部当量比从0.929增加到2.093,爆轰波速度从2 070 m/s降低到1 690 m/s,爆轰波压力从5.67 MPa降低到4.87 MPa.燃烧室内基本的流场与气相旋转爆轰发动机相似,但气固两相之间的相互作用使得颗粒呈现出特有的分布特性,包括2个颗粒群和4条颗粒带以及它们之间的间隙.
Abstract
The flow field of a gas-solid two-phase rotating detonation engine taking aluminum powder as fuel and air as oxidant with one step reaction was investigated by two-dimensional numerical simulations at different equivalence ratios.Results showed that the velocity of the detonation wave decreased from 2 070 m/s to 1 690 m/s and detonation pressure decreased from 5.67 MPa to 4.87 MPa when the equivalence ratio increased from 0.6 to 1.4,because the average local equivalence ratio increased from 0.929 to 2.093,which was caused by incomplete overlapping of trigonal zones between air and particles because of the injection velocity difference between air and particles.The flow field was similar to that in gas phase rotating detonation engines.However,unique distribution characteristics,including two particle groups,four particle bands and gaps among them due to the interaction between gas phase and solid phase,were obtained.
关键词
旋转爆轰发动机/气固两相流/当量比/铝粉/爆燃Key words
rotating detonation engine/gas-solid two-phase flow/equivalence ratio/aluminum powder/deflagration引用本文复制引用
基金项目
某装备发展部、装备预先研究领域基金(61407200113)
国家自然科学基金(91741202)
国家自然科学基金(52076003)
中央高校基本科研业务费专项(buctrc201913)
出版年
2024
NETL
NSTL
万方数据