负温度梯度对预混气体反应波传播模态的影响  

Effects of Negative Temperature Gradient on Reaction Wave Propagation Mode for Premixed Mixture

作　　者：马国斌 刘昌文[1] 潘家营[1] 卫海桥[1] 商艺宝 Ma Guobin;Liu Changwen;Pan Jiaying;Wei Haiqiao;Shang Yibao(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;Shanghai Automobile Group Passenger Vehicles Branch,Shanghai 201800,China)

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]上海汽车集团股份有限公司乘用车分公司,上海201800

出　　处：《内燃机学报》2020年第3期234-240,共7页Transactions of Csice

基　　金：国家自然科学基金资助项目(51706152);天津市自然科学基金资助项目(18JCQNJC07500).

摘　　要：基于一维数值模拟研究了负温度梯度对氢气/空气混合气反应波传播模态的影响,重点论述燃烧模态的转变机理.研究表明:当反应波沿着负温度梯度传播时,可以观测到超声速爆燃向爆震、爆震向亚声速爆燃的转变;其中,超声速爆燃传播过程由顺序自燃控制;当其传播速度低于当地Chapman-Jouguet爆震速度时,会发生超声速爆燃向爆震的转变.此外,在低温区域也观测到了爆震向亚声速爆燃的转变.Zel’dovich(ZND)结构和RankineHugoniot曲线表明,诱导激波后混合气反应活性对维持爆震传播具有重要作用.Effects of negative temperature gradient on reaction wave propagation mode of H2/air mixture were numerically investigated using one-dimensional numerical simulations,with addressing mode transition mechanism.It is found that when reaction wave propagates along negative temperature gradient,both supersonic deflagrationto-detonation and detonation-to-subsonic deflagration transitions can be observed.It shows that supersonic deflagration propagation is controlled by sequential auto-ignition.When its propagation speed is below local ChapmanJouguet detonation speed,a mode transition from supersonic deflagration to detonation occurs.Moreover,a mode transition from detonation to subsonic deflagration is also observed within lower temperature ranges.The evolution of Zel’dovich(ZND)structure and Rankine-Hugoniot curve shows that the reactivity of shocked mixture behind precursor pressure wave plays an important role in sustaining detonation propagation.

关 键 词：反应波传播模态 负温度梯度 模态转变 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]