管束间空气-水两相流激振力特性及归一化方法研究

Research on Characteristics and Normalization of Buffeting Force in Tube Bundles Subjected to Air-water Two-phase Flow

利用管束间空气-水两相流激振力的实验数据,研究了两相流激振力的部分特性,分析了混合物流速、空泡特征长度等两相流参数对两相流激振力的影响。结果表明,两相流激振力约与界面流速、混合物密度和混合物运动黏度呈正比,泡状流下激振力随气泡直径线性增长,证明两相流激振力的无量纲归一化可采用气泡数率作为频率缩比参数。基于上述两相流激振力的特性,从方便工程应用角度给出了两相流激振力的无量纲归一化方法,获得了较好的归一化效果。

With the experimental data of buffeting force in tube bundles subjected to airwater two-phase flow,the characteristics of buffeting force associated with two-phase flow were determined,and the effect of mixture velocity and bubble size on buffeting force was analyzed.The results show that the buffeting force increases linearly with the interfacial velocity,mixture density and kinematical viscosity,and the buffeting force in the bubbly flow regime increases linearly with the bubble size.It is discovered that the dominant frequency of buffeting force of two phase flow is correlative with the bubble number rate.Based on the characteristics of buffeting force,a normalized expression for the buffeting force is given for engineering application.A better normalized effect is obtained with this expression.