摘要
为分析单个液滴在高温燃气中的运动和蒸发过程,考虑了气-液两相耦合,建立了描述整个过程的数理模型,并通过计算获得了液滴直径、速度和平均温度的变化规律以及燃气温度和速度的影响.计算结果显示,较高的燃气温度和速度都能加速蒸发过程.另外发现当燃气温度沿液滴运动方向降低时,存在一个临界液滴直径,小于该值时,燃气速度越高液滴蒸发时间越短,超过该值时,燃气速度越高液滴蒸发时间越长.在文中的计算条件下测得该临界值约为100μm.所得结果可为雾化液滴群在高温气流中的蒸发特性研究提供依据.
To understand the movement and evaporation behavior of single droplet in high temperature fuel gas, a mathematical model was proposed by considering the gas-liquid two-phase coupling. The droplet diameter, velocity and average temperature during its evaporating process and the influence of the fuel gas temperature （1 530 K - 2 130 K） and velocity （30 m/s - 60 m/s） were analyzed. The numerical results show that both higher temperature and higher velocity of fuel gas can accelerate the evaporation of droplet. When the fuel gas temperature decreases continuously along the droplet movement direction, a critical droplet diameter for evaporation exists. The evaporation time shortens with the increasing gas velocity as the droplet diameter gets lower than the critical value. However, the trend is contrary to the droplet diameter beyond that value. In the present condition （the temperature of the fuel gas drops from 2 210 K to 1 090 K along 550 mm length）, the critical value is 100 μm. The evaporation investigation of a single droplet provides a foundation for the research of spray evaporation in high temperature gas.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2008年第7期833-837,共5页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(50521604)
新世纪优秀人才支持计划资助项目(NCET-04-0923)
关键词
高温燃气
液滴
蒸发
high temperature fuel gas
droplet
evaporation
