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›› 2014, Vol. 14 ›› Issue (4): 549-555.

• 流动与传递 • 上一篇    下一篇

不同形状喷嘴的射流流动与卷吸特性

禹言芳 李春晓 孟辉波 王艳芬 宋明远 吴剑华   

  1. 沈阳化工大学机械工程学院 沈阳化工大学机械工程学院 沈阳化工大学机械工程学院 沈阳化工大学机械工程学院 沈阳化工大学机械工程学院 沈阳化工大学能源与动力工程学院
  • 收稿日期:2014-04-14 修回日期:2014-07-04 出版日期:2014-08-20 发布日期:2014-08-20
  • 通讯作者: 禹言芳

Flow and Entrainment Characteristics of Jet from Different Shape Nozzles

YU Yan-fang LI Chun-xiao MENG Hui-bo WANG Yan-fen SONG Ming-yuan WU Jian-hua   

  1. College of Mechanical Engineering, Shenyang University of Chemical Technology College of Mechanical Engineering, Shenyang University of Chemical Technology College of Mechanical Engineering, Shenyang University of Chemical Technology College of Mechanical Engineering, Shenyang University of Chemical Technology College of Mechanical Engineering, Shenyang University of Chemical Technology College of Mechanical Engineering, Shenyang Institute of Chemical Technology
  • Received:2014-04-14 Revised:2014-07-04 Online:2014-08-20 Published:2014-08-20
  • Contact: YU Yan-fang

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摘要： 在不同雷诺数下，基于ANSYS Fluent 6.3软件对圆、椭圆、正方、十字、三角5种形状喷嘴的射流卷吸特性进行数值模拟，分析了轴向射流时均速度分布. 结果表明，三角形喷嘴的射流轴向最大时均速度最大，不同形状喷嘴的射流轴向最大时均速度均随轴向位置增大呈幂函数关系衰减；射流穿透深度与雷诺数和弗劳德准数存在多元线性关系；随轴向位置增大，射流横截面形状由初始段内喷嘴形状逐渐向圆形转化并最终扩展为圆形边界；射流轴线速度半值宽随轴向位置增加呈线性增大趋势，三角形喷嘴的卷吸率是十字形喷嘴的1.92~2.32倍.

关键词: 喷嘴形状, 射流, 射流穿透深度, 卷吸率, 数值模拟

Abstract: The entrainment characteristics of five different shape nozzles, circular, elliptic, square, cross and triangular, were simulated by using CFD ANSYS Fluent 6.3, their jet axial velocity and streamwise velocity contour maps under different Reynolds number values were analyzed and compared. The results showed that the jet axial velocity decayed by power exponent with the axial location, and the jet axial velocity values of triangular nozzle were the maximum among the five nozzles. The multiple linear relationships between jet penetration and Reynolds number and Froude number were regressed. It could be seen from the contour maps of streamwise velocity of five different nozzles that the shapes of jet cross-section were in accordance with corresponding shape nozzle in jet initial region, and the border of jet cross-section was transformed gradually into circular shape with increasing of the axial location. The half-width of the jet axial velocity increased linearly with increasing of the axial position. Moreover jet entrainment and mixing characteristics were analyzed by comparing half-velocity widths and entrainment ratios of five different nozzle shapes. The jet entrainment ratio of triangular shape nozzle was 1.92~2.32 times than that of cross shape nozzle.

Key words: nozzle shape, jet, jet penetration depth, entrainment rate, numerical simulation

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