Experimental visualization of sphere-induced oblique detonation in a non-uniform mixture

Iwata K.; Hanyu N.; Maeda S.Obara T.

首页> 外文期刊>Combustion and Flame >Experimental visualization of sphere-induced oblique detonation in a non-uniform mixture

【24h】

Experimental visualization of sphere-induced oblique detonation in a non-uniform mixture

机译：Experimental visualization of sphere-induced oblique detonation in a non-uniform mixture

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相关主题

摘要

? 2022To the best of our knowledge, this study is the first to adopt an experimental approach for addressing the theoretical properties of sphere-induced oblique detonation in a non-uniform mixture. A stratified H2/O2–3Ar mixture was supplied with a concentration gradient normal to the launching direction of a two-stage light gas gun. High-speed schlieren images were taken to study the morphologies of oblique detonation. The waiting time after the H2 injection until the launch was varied to investigate the effect of the concentration gradient. Oblique detonations were successfully formed in every condition considered with curved wave fronts and Chapman-Jouguet detonations were partially achieved. However, stronger concentration gradients induced several critical structures, such as local quenching and a Straw-Hat structure. Also interestingly, a part of the detonation front in the region where the Chapman-Jouguet solution does not exist propagated relative to the projectile, whereas the rest remained steady. Moreover, analysis of several relevant physical length scales indicated that the nondimensional diameter, which is critical for initiating detonation in a uniform mixture, could be a valid criterion near the projectile, but not far from it. Instead, the wave curvature determined the local structures of oblique detonation, which quantitatively explained the velocity deficit and emergence of the critical structures. We believe the findings of this study will benefit the understanding of non-uniformly premixed detonation in a propagating form owing to its analogy to an oblique detonation.

著录项

来源
《Combustion and Flame》 |2022年第10期|1-15|共15页
作者
Iwata K.; Hanyu N.; Maeda S.Obara T.;
展开▼
作者单位

Graduate School of Science Kyoto University;

Graduate School of Science and Engineering Saitama University;

展开▼
收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类
关键词
Hydrogen; Non-uniform; Oblique detonation; Two-stage light gas gun;

Experimental visualization of sphere-induced oblique detonation in a non-uniform mixture

摘要

著录项

相关主题

期刊订阅