氧化剂中氧含量对气液两相旋转爆轰影响的数值模拟和实验研究  

Numerical simulation and experimental study on the effect of oxygen content in oxidizer on gas-liquid two-phase rotating detonation

作　　者：李宝星 舒慧明[1] 李宏岩[1] 赵凤起[1] 翁春生[2] 古呈辉[1] LI Baoxing;SHU Huiming;LI Hongyan;ZHAO Fengqi;WENG Chunsheng;GU Chenghui(Xi'an Modern Chemistry Research Institute,Xi'an 710065,China;National Key Lab of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]西安近代化学研究所,西安710065 [2]南京理工大学瞬态物理国家重点实验室,南京210094

出　　处：《固体火箭技术》2020年第6期714-724,共11页Journal of Solid Rocket Technology

基　　金：国家自然科学基金(11802039,11802117)。

摘　　要：为研究氧化剂中氧含量对气液两相旋转爆轰波起爆与传播特性的影响,以汽油为燃料,富氧空气为氧化剂,开展数值模拟和实验研究,模拟了气液两相旋转爆轰波的形成过程,获得了稳定旋转爆轰流场结构,分析了不同氧含量下爆轰波起爆与传播特性。计算结果表明,稳定旋转爆轰流场由爆轰波、斜激波、爆轰产物及其间断面、预混燃料层以及爆轰产物与燃料层之间的接触面等复杂波系组成;当氧化剂中氧含量偏低,预混燃料反应活性偏低,爆轰波难以起爆,当氧含量增加至30%时,才能形成自持传播的爆轰波,随着氧含量的增加,燃烧强度增加,爆轰压力、温度及爆轰波速度均增加;当氧气含量进一步增加到40%时,虽然成功起爆,但爆轰波最终以双波对撞模态传播,爆轰压力和速度有所降低。实验结果显示:在当前模型下,气液两相旋转爆轰波起爆条件更加苛刻,当氧化剂中氧气质量含量增加至37%时,才能形成自持传播的爆轰波,起爆后爆轰波以双波对撞模态传播。In order to study the effect of oxygen content in the oxidant on the initiation and propagation characteristics of gas-liquid two-phase rotating detonation wave,and the gasoline and oxygen enriched air were used as fuel and oxidant,numerical simulation and experimental research were carried out.The formation process of gas-liquid two-phase rotating detonation wave was simulated,the flow field structure of stable rotating detonation was obtained,and the detonation wave initiation and propagation characteristics of detonation wave under different oxygen contents were analyzed.The calculation results show that the flow field structure of stable rotating detonation is composed of detonation wave,oblique shock wave,detonation product and its discontinuity surface,premixed fuel layer,and the contact surface between detonation product and fuel layer.When the oxygen content in the oxidant is low,the reaction activity of the premixed fuel is low,and this makes it difficult for the detonation wave to initiate.Until the oxygen content increases to 30%,a self-propagating detonation wave can be formed.With the increase of oxygen content,the combustion intensity increases,and the detonation pressure,temperature and detonation wave velocity all increase.When the oxygen content further increases to 40%,although the detonation was successfully initiated,the detonation wave eventually propagated in a double-wave collision mode,and the detonation pressure and velocity were reduced.The experimental results show that under the current model,the initiation conditions of gas-liquid two-phase rotating detonation wave are more rigorous,the self-sustaining detonation wave can be formed when the mass content of oxygen in oxidant increases to 37%.After detonation,the detonation wave propagates in the mode of double-wave collision in the current model.

关 键 词：氧含量 气液两相旋转爆轰 流场结构 起爆与传播特性 双波对撞模态 

分 类 号：V231.22[航空宇航科学与技术—航空宇航推进理论与工程]