气液两相旋流燃烧的时均统计特性  

Time-Average Character of Gas-Liquid Two Phase Swirl Combustion

作　　者：杨建山[1] 罗坤[1] 邵长孝[1] 樊建人[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《工程热物理学报》2015年第2期335-337,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51176170);全国百篇优秀博士学位论文作者专项资助项目(No.2007B4)

摘　　要：通过直接数值模拟的方法研究了旋流燃烧器中三维正庚烷喷雾燃烧,为实际喷雾蒸发和燃烧问题提供参考。气相燃烧模型采用自适应单步反应机理,液相采用拉格朗日方法跟踪,液滴蒸发采用无限传导蒸发模型。本文研究了气相和液相时均特性.结果发现燃烧和中心回流区(CRZ)之间有相互促进作用;同向旋流导致更强的中心回流区(CRZ),但是会有更小的外部回流区(ORZ);富预混燃烧会有更高的化学反应速率,并且蒸发冷却的影响更为明显;湍流入流会导致更高的液滴散布和更小的液滴直径。In order to provide a reference of the actual spray evaporation and combustion,Threedimensional swirling spray combustion under different condition were studied by Direct Numerical Simulation(DNS).The gas combustion was modeled by an adaptive one-step reaction mechanism,the droplets were tracked in Lagrangian framework and the evaporation was described by infinite heat conduction model.We have learned the time-average character for both gas phase and liquid phase.It was found that there is mutually reinforcing effect between the combustion and the central recirculation zone(CRZ).Co-swirling leads to a stronger central recirculation zone(CRZ),but there will be a smaller outer recirculation zone(ORZ).The reaction rate is much higher and evaporative cooling effect is more obvious in rich combustion.Turbulence inflow will make contribution to higher dispersed droplets and smaller droplets.

关 键 词：液雾燃烧 直接数值模拟 旋流燃烧 时均特性 

分 类 号：O359.1[理学—流体力学]