垂直锐边孔口的自由出流特性(Ⅰ) 流动状态和孔结构参数对孔流系数的影响  

Characteristics of vertical sharp-edged orifice discharge(Ⅰ) Effect of flow regime and configuration parameters on orifice discharge coefficient

作　　者：曹睿[1] 刘艳升[1] 严超宇[1] 王东升[1] 仵浩[1] 

机构地区：[1]中国石油大学(北京)化学科学与工程学院,北京102249

出　　处：《化工学报》2008年第9期2175-2180,共6页CIESC Journal

基　　金：国家自然科学基金项目(20476059)~~

摘　　要：通过实验,考察了Reynolds数、液层高等操作参数和孔径、板厚等结构参数对垂直锐边孔口自由出流特性的影响。在此基础上,根据孔流系数曲线的不同规律,将孔流机理划分为"大孔机理"和"小孔机理",并对孔流曲线进行了分区讨论,借助边界层理论,探讨了这两类孔流过程的机械能损失差异以及孔流曲线在不同操作区的机械能损失差异。The effects of Reynolds number, liquid head, orifice diameter and plate thickness on the flow characteristics of vertical sharp-edged orifice discharge were investigated experimentally. According to the distinct profiles of orifice discharge coefficient, it was found that the orifice discharge followed two mechanisms of “small orifice” and “large orifice”, and the orifice coefficients were analyzed regionally. The dissipation of mechanical energy in the orifice flow process with respect to “small orifice” and “large orifice” and the energy loss in different operating regimes were discussed on the basis of the boundary layer theory.

关 键 词：孔流系数 REYNOLDS数 液层高 孔径板厚比 边界层 

分 类 号：TQ022.12[化学工程]