衍射诱导的斜爆震波反射现象数值模拟研究

陈伟强; 刘彧; 王兰

doi:10.7638/kqdlxxb-2025.0097

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衍射诱导的斜爆震波反射现象数值模拟研究

研究专栏——爆震流动机理与推进技术专栏Ⅰ | 更新时间：2026-05-28

- 衍射诱导的斜爆震波反射现象数值模拟研究
- Numerical study on diffraction-induced oblique detonation reflection phenomena
- 空气动力学学报 2025年43卷第9期页码：127-136
- 作者机构：
  
  中国空气动力研究与发展中心空天技术研究所,绵阳,621000
- 作者简介：
  
  陈伟强（1989—），男，福建龙岩人，助理研究员，研究方向：爆震燃烧. E-mail：wqchancn@163.com
  刘彧*（1986—），男，河南洛阳人，副研究员，研究方向：爆震燃烧与推进. E-mail：524698053@qq.com
- 基金信息：
  
  国家自然科学基金（11702316）
- DOI：10.7638/kqdlxxb-2025.0097
  中图分类号： V231
- 纸质出版：2025
- 稿件说明：
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陈伟强, 刘彧, 王兰. 衍射诱导的斜爆震波反射现象数值模拟研究[J]. 空气动力学学报, 2025, 43(9): 127−136.

CHEN Weiqiang, LIU Yu, WANG Lan. Numerical study on diffraction-induced oblique detonation reflection phenomena[J]. 2025, 43(9): 127-136.
陈伟强, 刘彧, 王兰. 衍射诱导的斜爆震波反射现象数值模拟研究[J]. 空气动力学学报, 2025, 43(9): 127−136. DOI： 10.7638/kqdlxxb-2025.0097

CHEN Weiqiang, LIU Yu, WANG Lan. Numerical study on diffraction-induced oblique detonation reflection phenomena[J]. 2025, 43(9): 127-136. DOI： 10.7638/kqdlxxb-2025.0097.

摘要

斜爆震的反射是斜爆震发动机燃烧室中存在的一类重要现象。为了深入理解斜爆震的反射波系结构特征，本文采用块结构自适应网格加密程序开展了正爆轰波衍射诱导的斜爆震波反射现象数值模拟研究。通过求解带化学反应的二维Euler方程，研究了正爆震波驱动下斜爆震波的反射过程，并对比研究了不同被驱动段高度（2、3、4 cm）、预混气体压力（20、40、50 kPa）以及预混气当量比（0.2、0.35、0.5、0.65、0.8）对波面反射特性的影响。研究表明正爆震波在预混气中驱动诱导形成斜激波和斜爆震波，分别经历爆震衍射、规则反射、规则反射向马赫反射转变，以及马赫反射诱导爆震波4个典型过程，且马赫反射结构具有自相似性。随着被驱动段高度的增大，侧向膨胀效应的增强使得被驱动段内衍射激波及其诱导的燃烧强度减弱，相应的规则反射及马赫反射也被削弱。随着预混气初始压力的增大，爆震衍射形成的斜激波波角减小，延迟了规则反射向马赫反射的转变过程。随着被驱动段预混气当量比的增大，被驱动段分别经历衍射激波诱导弱不稳定燃烧、衍射激波诱导强不稳定燃烧向斜爆震的过渡，以及衍射斜爆震3种形态。

Abstract

The reflection of oblique detonation is an important phenomenon in the combustor of oblique detonation engines. To deeply understand the structural characteristics of the reflected wave system of oblique detonation

this paper conducts a numerical study on the reflection phenomenon of oblique detonation waves induced by the diffraction of normal detonation waves using a block structured adaptive mesh refinement program. By solving the two-dimensional Euler equations with chemical reactions

the reflection process of oblique detonation waves driven by normal detonation waves was studied. The effects of different driven section heights (2

4 cm)

initial premixed gas pressures (20

50 kPa)

and premixed gas equivalence ratios (0.2

0.35

0.5

0.65

0.8) on the wave front reflection characteristics were comparatively investigated. The results showed that the normal detonation wave drived and induced the formation of oblique shock waves and oblique detonation waves in the premixed gas

which underwent four typical processes: detonation diffraction

regular reflection

transition from regular reflection to Mach reflection

and Mach reflection-induced detonation waves. Moreover

the Mach reflection structure exhibited self-similarity. As the height of the driven section increased

the enhanced lateral expansion effect weakened the diffraction shock wave and the induced combustion intensity within the driven section

correspondingly weakening the regular reflection and Mach reflection. As the initial pressure of the premixed gas increased

the angle of the oblique shock wave formed by detonation diffraction decreased

delaying the transition from regular reflection to Mach reflection. As the equivalence ratio of the premixed gas in the driven section increased

the driven section experienced three different states: weakly unstable combustion induced by the diffraction shock wave

transition from strongly unstable combustion induced by the diffraction shock wave to oblique detonation

and diffractive oblique detonation.

关键词

Keywords

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