摘要
考虑羽流虚拟源点位置的影响,通过测量受限空间内随时间变化的羽流界面位置高度,确定纯羽流条件下卷吸系数,并利用有内热源条件下置换流动实验进行了验证。对两种计算虚拟源方法进行比较,Baines计算方法得到虚拟源位置受到模型长度和高度影响,Hunt的方法确定虚拟源位置仅是源条件的函数,卷吸系数确定过程中,Hunt的方法相比Baines的方法更为合适。根据源参数Γ与卷吸系数关系,利用插值法确定纯羽流即Γ=1时卷吸系数为0.0987。利用点热源产生置换流动实验验证卷吸系数,得到分层界面的实验点与卷吸系数取值0.096对应的理论曲线之间的标准差为0.0178。结合与文献中卷吸系数的比较,表明虚拟源点位置修正耦合受限空间羽流界面位置实验是一种确定卷吸系数的有效方法。
Considering the influence of the position of the asymptotic virtual source,the entrainment coefficient of pure plume is determined by measuring the height of plume interface which varies with time in a confined region.The displacement flowing experiment with internal heat source is used to verify the entrainment coefficient.By comparing the two methods of calculating virtual sources,Baines’s method shows that the position of virtual source is affected by the length and height of the model and Hunt’s method indicates that the position of the asymptotic virtual source is only a function of the source parameter.In the process of determining the entrainment coefficient,Hunt’s method is more suitable than Baines’method.According to the relationship between the source parameterΓand entrainment coefficient,the entrainment coefficient of pure plume is 0.0987 by interpolation method.The entrainment coefficient was validated by displacement flowing experiment with a point heat source.The standard deviation between the experimental point of stratified interface and the theoretical curve which corresponds to the entrainment coefficient that is 0.096 is0.0178.Comparing with the entrainment coefficients in literature,it is shown that the determination of the interface position in a confined region coupling with virtual source correction is an effective method to determine the entrainment coefficient.
作者
刘洋
力晓晴
黄澜
欧阳腾
LIU Yang;LI Xiao-Qing;HUANG Lan;OUYANG Teng(School of architectural and surveying&mapping engineering,Jiangxi university of science and technology,Ganzhou 341000,China;School of mechanical engineering and automation,Harbin institute of technology,Shenzhen 518055,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2020年第10期2501-2510,共10页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51666003)。
关键词
卷吸系数
虚拟源
热羽流
分层界面
盐水实验
entrainment coefficient
virtual source
thermal plume
stratified interface
salt-water model
