火箭推进2025，Vol.51Issue(2)：76-86,11.DOI:10.3969/j.issn.1672-9374.2025.02.008
阻塞比影响氢气-空气预混气体火焰加速和DDT过程的数值分析
Numerical analysis on the effect of blockage ratio on flame acceleration and DDT processes of hydrogen-air premixed gases
摘要
Abstract
Based on the OpenFOAM platform,the effects of different obstacle blockage ratios on flame acceleration and DDT processes of hydrogen-air premixed gases in the channel were studied in detail by using the unsteady Reynolds-average Navier-Stokes simulation method.The results show that the effects of different blockage ratios on flame acceleration are different.Too small and too large blockage ratios are not conducive to flame acceleration.When the blockage ratio is too small(≤0.15),the effect on flame acceleration is similar to that without obstacles.When the blockage ratio is too large(≥0.90),the suppression of the reflected wave on flame acceleration is enhanced,which is not favorable for the DDT process.Actually,the flame acceleration in the channel is mainly the result of the interaction among the flame,the compression wave,the wall and the obstacle.In addition,the detonation initiation process can be divided into two types:one is that the local high-pressure region is generated after the interaction between the reflected shock wave and the flame surface,and then the local detonation occurs;the other is the formation of high-temperature and high-pressure hot spots at the obstacles in front of the flame tip,which leads to local detonation.It is further found that different blockage ratios lead to the relative range of time and distance of DDT process reaching 23.52%and 35.67%,respectively,which also reflects the important influence of blockage ratio on DDT process.关键词
火焰加速/爆燃转爆轰/固体障碍物/阻塞比/激波/爆轰波Key words
flame acceleration/deflagration to detonation transition/solid obstacle/blockage ratio/shock wave/detonation wave引用本文复制引用
吴宇,王家宝,范良熠,李润泽,朱跃进..阻塞比影响氢气-空气预混气体火焰加速和DDT过程的数值分析[J].火箭推进,2025,51(2):76-86,11.基金项目
国家自然科学基金(11872193) （11872193）
