In this paper,the dynamic characteristics of a vertical vortex are examined by the theoretical method and the particle image velocimetry(PIV)technology.The results of the theoretical analysis validate that the main pa...In this paper,the dynamic characteristics of a vertical vortex are examined by the theoretical method and the particle image velocimetry(PIV)technology.The results of the theoretical analysis validate that the main parameters of the vertical vortex are the Reynolds number Re,water level WL^(*)and velocity circulationΓ_(N).The experimental results indicate that,for the same Re,the low water levels are responsible for an intensive vortex intensity(maximum vorticity),but for a high-water level,water level is no longer a significant influencing factor on vortex intensity.TheΓ_(N)number increases with the rising of the Reynolds number Re and drops with the height of measurement section enhance for a low water level case.For the higher WL^(*),Γ_(N)does not decrease significantly.The formation and evolution of the vertical vortex in the present paper can be utilized or restrained by controlling the relevant dynamic parameters.Obtained research results may provide an important reference for engineering applications with possible occurrence of vertical vortex phenomenon.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.52279084)the Fundamental Research Funds for the Central Universities(Grant No.2024JC003).
文摘In this paper,the dynamic characteristics of a vertical vortex are examined by the theoretical method and the particle image velocimetry(PIV)technology.The results of the theoretical analysis validate that the main parameters of the vertical vortex are the Reynolds number Re,water level WL^(*)and velocity circulationΓ_(N).The experimental results indicate that,for the same Re,the low water levels are responsible for an intensive vortex intensity(maximum vorticity),but for a high-water level,water level is no longer a significant influencing factor on vortex intensity.TheΓ_(N)number increases with the rising of the Reynolds number Re and drops with the height of measurement section enhance for a low water level case.For the higher WL^(*),Γ_(N)does not decrease significantly.The formation and evolution of the vertical vortex in the present paper can be utilized or restrained by controlling the relevant dynamic parameters.Obtained research results may provide an important reference for engineering applications with possible occurrence of vertical vortex phenomenon.
