圆柱—圆锥型喷水孔的流体动力特性  

Dynamic Characteristics of a Capillary-Cone Hydroentangling Orifice

作　　者：王彩华[1] 靳向煜[1] 王善元[1] 

机构地区：[1]东华大学纺织学院,上海200051

出　　处：《东华大学学报（自然科学版）》2007年第2期175-179,共5页Journal of Donghua University(Natural Science)

摘　　要：为研究圆柱-圆锥型喷水孔的流体动力特性,采用不可压缩二维轴对称N-S方程,利用“RNG”k-ε湍流模型与VOF多相流模型和有限体积法对高压高速自由射流场进行数值模拟.模拟结果表明,对于入口转角为直角的轴对称喷水孔口,水在孔口入口处与壁面分离并开始收缩,收缩后的水针与孔口壁不再接触,两者被逆流而上的空气隔开.收缩水针所表现出来的流动特性符合水刺生产要求.通过数值模拟,了解了喷水孔内外流场的流动状态以及流场各参数在空间的变化规律,为喷水孔的设计与选择提供计算依据.The characteristics of water flow inside a capillary-cone hydroentangling orifice with sharp-edged inlet is simulated. An axisymmetric unsteady-state model is considered for this two-phase system of water and air. The turbulent water-jet is simulated using a RNG k-~ model, and the behaviors of the capillarycone hydroentangling orifice are investigated. The simulation reveals that the orifice with sharp-edged inlet can form a constricted water-jet that is enveloped by air gap, which separates the water from the orifice surface. The results demonstrate favorable agreement with previous experimental studies.

关 键 词：水针板 喷水孔 自由射流 流体动力特性 数值模拟 

分 类 号：TS174.12[轻工技术与工程—纺织材料与纺织品设计]