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<p>In order to improve the surface cleaning efficiency of fan-shaped water jet, a kind of axial fan cavitation nozzle is designed to produce fan-shaped cavitation water jet used to clean the surfaces of various equipment. A physical model of an axial fan cavitation nozzle and its computational domain for fan-shaped cavitation water jet flow fields were established. Numerical simulations were conducted using ANSYS FLUENT with the Mixture multiphase model, Schnerr–Sauer cavitation model, and Realizable <i>k</i>-ε turbulence model to analyze the internal and downstream flow characteristics within and downstream of the nozzle. The simulation results show that the jet velocity tends to decrease along the direction of jet flow from the front end of the cylindrical center body to the rear on the plane passing through the bottom of the V-groove (PPTBV) and the plane perpendicular to the V-groove (PPV) for different axial fan cavitation nozzles except the kind of axial fan cavitation nozzle of <i>b</i>/<i>r</i>=2. And in the direction perpendicular to the horizontal axis, the jet velocity also tends to decrease from the middle toward the sides. On the plane passing through the bottom of the V-groove (PPTBV) and the plane perpendicular to the V-groove (PPV) for different axial fan cavitation nozzles, there is a area where the vapor volume fraction is greater than 0 in front of the cylindrical central body. And the vapor volume fraction is the highest adjacent to the front end of the cylindrical central body and tends to decrease in the direction of the jet flow. On the plane perpendicular to the V-groove (PPV), there is a area where the vapor volume fraction is greater than 0 near the wall surfaces on both sides of the V-groove after the opening position of the axial fan cavitation nozzle. When α<sub>2</sub>/<i>r</i> =3, there is a area where the vapor volume fraction is greater than 0 resembling human lungs on both sides and in front of the cylindrical central body. Meanwhile, the fan-shaped cavitation water jet presents a flattening shape, which is beneficial for increasing the cleaning width of the fan-shaped cavitation water jet and realizing precise control of the cleaning process. When <i>b</i>/<i>r</i>=2, the fan-shaped cavitation water jet exhibits a bifurcation phenomenon.</p>

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Research on the Internal and Downstream Flow Field Characteristics of an Axial Fan Cavitation Nozzle for Surface Cleaning

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Jinfa Guan,
  • Jimiao Duan,
  • Yan Chen,
  • Sichen He,
  • Keyu Lin,
  • Run Li,
  • Shiming Chen

摘要

In order to improve the surface cleaning efficiency of fan-shaped water jet, a kind of axial fan cavitation nozzle is designed to produce fan-shaped cavitation water jet used to clean the surfaces of various equipment. A physical model of an axial fan cavitation nozzle and its computational domain for fan-shaped cavitation water jet flow fields were established. Numerical simulations were conducted using ANSYS FLUENT with the Mixture multiphase model, Schnerr–Sauer cavitation model, and Realizable k-ε turbulence model to analyze the internal and downstream flow characteristics within and downstream of the nozzle. The simulation results show that the jet velocity tends to decrease along the direction of jet flow from the front end of the cylindrical center body to the rear on the plane passing through the bottom of the V-groove (PPTBV) and the plane perpendicular to the V-groove (PPV) for different axial fan cavitation nozzles except the kind of axial fan cavitation nozzle of b/r=2. And in the direction perpendicular to the horizontal axis, the jet velocity also tends to decrease from the middle toward the sides. On the plane passing through the bottom of the V-groove (PPTBV) and the plane perpendicular to the V-groove (PPV) for different axial fan cavitation nozzles, there is a area where the vapor volume fraction is greater than 0 in front of the cylindrical central body. And the vapor volume fraction is the highest adjacent to the front end of the cylindrical central body and tends to decrease in the direction of the jet flow. On the plane perpendicular to the V-groove (PPV), there is a area where the vapor volume fraction is greater than 0 near the wall surfaces on both sides of the V-groove after the opening position of the axial fan cavitation nozzle. When α2/r =3, there is a area where the vapor volume fraction is greater than 0 resembling human lungs on both sides and in front of the cylindrical central body. Meanwhile, the fan-shaped cavitation water jet presents a flattening shape, which is beneficial for increasing the cleaning width of the fan-shaped cavitation water jet and realizing precise control of the cleaning process. When b/r=2, the fan-shaped cavitation water jet exhibits a bifurcation phenomenon.