摘要
建立了静止环境中正方形孔口浮力射流的三维湍流模型,考虑浮力对射流的影响,采用混合有限分析数值格式来离散求解数学模型,给出了其数值模拟结果.为验证该数学模型和计算方法以及所得到的数值结果的正确性,对静止半无限环境中的正方形孔口的浮射流进行了试验,测量得到了各工况下轴线上的温度,试验资料与数值模拟结果的良好吻合表明该数学模型和计算方法能有效的模拟该类流动.将试验结果与已有的圆孔浮射流的轴线浓度比较发现两者符合良好.同时在离射流孔口一小段距离后,数值模拟得到的不同高度位置处的温度和纵向流速等值线分布形态与圆孔浮射流的分布形态完全一致,并验证了温度和流速自相似区域的存在.
The three-dimensional turbulent model considering buoyancy was used to simulate the buoyant flow from square orifice in static ambient. The hybrid finite analytic method with stagged grid is used to solve this model. Experiments were made on the buoyant jet from square orifice in half infinite static ambient to confirm the validity of the model. Concentration on the axis under different conditions was obtained. The results from experiments accord with those from the model and it shows that the mathematical model can simulate this kind of the three-dimensional buoyant flow very well. The concentration and longitudinal velocities on axis from square orifice were compared with those from circular and it found that the two graphs of concentration and velocities respectively accorded well. The shapes of temperature and longitudinal velocity distribution on different height cross-sections tallied well with those from circular orifice. The existence of self-similar area of temperature and longitudinal velocity was confirmed.
出处
《应用基础与工程科学学报》
EI
CSCD
2004年第4期361-369,共9页
Journal of Basic Science and Engineering
基金
教育部优秀教师资助计划
关键词
圆孔
射流特性
解数
正方形
数值格式
静止
求解
吻合
法能
试验资料
Computer simulation
Mathematical models
Orifices
Three dimensional
Turbulent flow
Velocity measurement
