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机构地区:[1]大连理工大学能源与动力学院,辽宁大连116024
出 处:《工程热物理学报》2009年第6期1071-1074,共4页Journal of Engineering Thermophysics
基 金:国家自然科学基金资助项目(No.50476073)
摘 要:以多孔介质发动机为背景,用数值模拟方法考察气缸内加入多孔介质蓄热体后对燃烧室内湍流流场及混合气形成的影响。建立了多孔介质随机结构的简化模型,把多孔介质视为随机分布的大量固相单元的集合。在多孔介质区域引入了Antohe和Lage提出的双方程k-ε湍流模型。为研究喷雾液滴与多孔介质的高温壁面碰撞,引入新的喷雾模型。在模型中考虑了液滴的破碎、碰撞和合并,并且描述了喷雾和多孔介质壁面之间的相互作用。针对燃油喷雾在不同结构多孔介质内流场进行了数值计算。计算表明,喷雾与多孔介质相互作用对燃烧室内燃油液滴的蒸发、混合气的形成过程和均匀化具有重要的影响。To understand the working mechanism of the porous medium(PM) internal combustion engine, effects of a porous medium heat regenerator inserted into a combustion chamber on the turbulent flow field and fuel-air mixture formation are studied by numerical simulation. A simplified model for the random structure of the PM is presented, in which the PM is represented by an assembly of a great number of randomly distributed solid units. A version of two-equation k-ε turbulence model suggested by Antohe and Lage is employed for the turbulence prediction in the PM. A spray model, in which the effects of drop breakup, collision and coalescence are taken into account, is introduced to describe spray/wall interactions. Numerical computations are performed for the turbulent flows induced by a fuel spray outside and inside of the PM with different structures. Calculation results show that the spray/PM interaction has substantial and positive influences on the fuel-air mixture formation and homogenization in the combustion chamber, which could be very advantageous in engine applications.
分 类 号:TK16[动力工程及工程热物理—热能工程]
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