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论文:2014,Vol:32,Issue(5):713-718 |
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引用本文： |
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郑龙席, 卢杰, 彭畅新, 王治武. 吸气式无阀脉冲爆震发动机DDT过程数值模拟[J]. 西北工业大学 |
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Zheng Longxi, Lu Jie, Peng Changxin, Wang Zhiwu. Numerical Investigation of DDT (Deflagration to Detonation Transition)Process in a Valveless Air-Breathing Pulse Detonation Engine[J]. Northwestern polytechnical university |
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| 吸气式无阀脉冲爆震发动机DDT过程数值模拟 |
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| 郑龙席1, 卢杰1, 彭畅新2, 王治武1 |
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1.西北工业大学 动力与能源学院, 陕西 西安 710072;
2.中航工业航空动力机械研究所, 湖南 株洲 412002 |
| 摘要: |
| 为了研究吸气式脉冲爆震发动机缓燃向爆震转变(deflagration to detonation transition,简称DDT)过程的特性,以丙烷和空气为燃料,对吸气式无阀脉冲爆震发动机的DDT过程进行二维数值模拟,并研究了点火能量和点火源数目对DDT过程的影响,分析了点火能量不同导致DDT过程差异的原因。数值模拟结果表明,在DDT过程中,激波以及反射激波的相互作用在爆震波的起爆方面起主导作用;在所模拟的小点火能量范围内,点火能量越高,DDT时间越短,但DDT距离却变化不大;在总点火能量一致的情况下,采用双点火源点火能够缩短DDT距离。 |
| 关键词:
脉冲爆震发动机
DDT
点火能量
多点火源
数值模拟
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| Numerical Investigation of DDT (Deflagration to Detonation Transition)Process in a Valveless Air-Breathing Pulse Detonation Engine |
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| Zheng Longxi1, Lu Jie1, Peng Changxin2, Wang Zhiwu1 |
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1. Department of Aero-Engines, Northwestern Polytechnical University, Xi'an 710072, China;
2. China Aviation Power Plant Research Institute, Zhuzhou 412002, China |
| Abstract: |
| In order to investigate the flow characteristics of the DDT process in an air-breathing pulse detonation en-gine,two dimensional numerical simulation of the DDT process in a valveless air-breathing pulse detonation enginewas carried out.The spark energy and the spark number were varied to investigate their effects on the DDTprocess.The mechanism that causes the difference in DDT process for different spark energies was analyzed.Thesimulation results indicated that: (1) The shock wave and reflected shock wave from the obstacles are the mainreason that leads to the DDT; (2) the time of the DDT process decreases with increasing spark energy for the rangeof spark energy involved,but the length of the DDT remains almost the same; (3) when dual ignition sources wereused,the length of the DDT was reduced compared with single ignition source of the same total spark energy. |
| Key words:
boundary conditions
computer simulation
computer software
detonation
flow fields
flow rate
functions
iterative methods
mathematical models
mesh generation
Navier Stokes equations
pulsedetonation engines
schematic diagrams
shock waves
temperature
turbulence models
two dimen-sional;multi-sparks
spark energy
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| 收稿日期: 2014-02-12
修回日期:
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| DOI: |
| 基金项目: 国家自然科学基金(51306153);陕西省自然科学基金(2014JM7258);高等学校博士学科点专项科研基金新教师类资助课题(20116102120027)与西北工业大学基础研究基金(NPU-FFR-JCY20130129)资助 |
| 通讯作者:
Email： |
| 作者简介: 郑龙席(1982-)，西北工业大学教授、博士生导师，主要从事航空发动机燃烧与流动研究。
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