当量比对富氢燃气旋转爆轰自起爆传播特性的影响  

Effect of Equivalent Ratio on Auto-initiation Propagation Characteristics of Rotating Detonation of Hydrogen-rich Gas

作　　者：高文佳 白桥栋[1] 韩家祥 邱晗 刘嘱勇 翁春生[1] GAO Wenjia;BAI Qiaodong;HAN Jiaxiang;QIU Han;LIU Zhuyong;WENG Chunsheng(National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学瞬态物理国家重点实验室,江苏南京210094

出　　处：《弹道学报》2025年第1期9-19,53,共12页Journal of Ballistics

基　　金：国防预研基金项目。

摘　　要：针对高温富氢燃气旋转爆轰自起爆现象,进行了实验研究,通过分析典型特征参数,探究了当量比对高温富氢燃气旋转爆轰波传播特性的影响,获得了高温富氢燃气成功自起爆形成旋转爆轰波的当量比范围,分析了当量比对自起爆延迟时间的影响。结果表明:自起爆形成的初始旋转爆轰波强度较弱,会出现传播方向的改变和传播模态的改变。但通过旋转爆轰的自调节,最终能实现旋转爆轰的稳定自持传播。当预燃氧气流量在8 g/s左右,空气流量在270 g/s时,在当量比范围为0.85~1.98区间内,高温富氢燃气能够通过自起爆形成稳定的旋转爆轰波。当量比大于1.52时旋转爆轰波呈单波模态;随着当量比减小,转变为混合模态,即在同一工况下,单波、双波模态和单/双波过渡模态无规律地交替出现。当量比减小到0.96左右时,旋转爆轰波呈现出稳定双波模态;随着当量比的增加,自起爆延迟时间从138 ms缩减至106 ms。旋转爆轰波的传播速度随着当量比的增加先增大后减小。波速的最大值出现在当量比为1.33,此时波速为1278 m/s。In order to deeply study the auto-initiation phenomenon of rotating detonation of high-temperature hydrogen-rich gas,the experimental study was carried out.The influence of equivalent ratio on the propagation characteristics of high-temperature hydrogen-rich gas rotational-detonation-wave was explored by analyzing the typical characteristic-parameters,and the equivalence-ratio range of the successful auto-initiation of high-temperature hydrogen-rich gas to form a rotational detonation wave was obtained,and the influence of equivalence ratio on the self-initiation delay time was analyzed.The results show that the intensity of the initial rotational detonation wave formed by auto-initiation is weak,and the propagation direction and propagation mode will change.However,through the self-adjustment of the rotational detonation,the stable self-sustaining propagation of the rotational detonation can be realized finally.While the flow rate of pre-fired oxygen is about 8 g/s and the air flow-rate is 270 g/s,within the equivalence-ratio range of 0.85-1.98,the high-temperature hydrogen-rich gas can form a stable rotational detonation wave through self-detonation.When the equivalence ratio is greater than 1.52,the rotational detonation wave is in a single-wave mode,and with the decrease of the equivalence ratio,it changes to a mixed mode,that is,under the same working condition,the single-wave,dual-wave mode and single/double-wave transition mode appear irregularly alternately.When the equivalence-ratio decreases to about 0.96,the rotational detonation wave presents a stable two-wave mode,and with the increase of the equivalence ratio,the auto-initiation delay time decreases from 138 ms to 106 ms.The propagation velocity of the rotational detonation wave increases first and then decreases with the increase of the equivalence ratio.The maximum value of the wave velocity occurs when the equivalence ratio is 1.33,and the wave velocity is 1278 m/s.

关 键 词：高温富氢燃气 旋转爆轰 自起爆过程 传播模态 当量比 

分 类 号：TJ385[兵器科学与技术—火炮、自动武器与弹药工程]