| The Structure of A Turbulent Jet in A Crossflow-Effect of Jet-Crossflow Velocity |
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| 作者姓名： | 李行伟 匡翠萍 陈国谦 |
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| 作者单位： | aDept.Of civil Engineering，University of Hong Kong，Hong Kong，bDepatment of River & Horbour Engineering，Nanjing Hydraulic Research Insstitute，cCentre for Environmental Sciences and Dept.of Mechanics，Beijing University China，Nanjing 210024，China，Beijing 100871，China |
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| 摘 要： | A comprehensive numerical study on the three-dimensional structure of a turbulent jet in crossflow is performed. The jet-to-crossflow velocity ratio (R) varies in the range of 2 - 16; both vertical jets and inclined jets without excess streamwise momentum are considered. The numerical results of the Standard two-equation k-ε model show that the turbulent structure can be broadly categorised according to the jet-to-crossflow velocity ratio. For strong to moderate jet discharges, i.e. R> 4, the jet is characterized by a longitudinal transition through a bent-over phase during which the jet becomes almost parallel with the main freestream, to a sectional vortex-pair flow with double concentration maxima; the computed flow details and scalar mixing characteristics can be described by self-similar relations beyond a dimensionless distance of around 20-60. The similarity coefficients are only weakly dependent on R. The cross-section scalar field is kidney-shaped and bifurcated, vvith distinct double concentr
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The Structure of A Turbulent Jet in A Crossflow-Effect of Jet-Crossflow Velocity |
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| Joseph H. W. LEE C. P. KUANG
and G. Q. CHEN
"Dept. Of Civil Engineering,University of Hong Kong,Hong Kong,China
Depatment of River & Horbour Engineering,Nanjing Hydraulic Research Insstitule,Nanjing ,China 'Centrefor Envronmental Sciences and Dept. of Mechanics,Beijing University,Beijing ,China.The Structure of A Turbulent Jet in A Crossflow-Effect of Jet-Crossflow Velocity[J].China Ocean Engineering,2002(1). |
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| Authors: | Joseph H W LEE C P KUANG
and G Q CHEN
"Dept Of Civil Engineering University of Hong Kong Hong Kong China
Depatment of River & Horbour Engineering Nanjing Hydraulic Research Insstitule Nanjing China 'Centrefor Envronmental Sciences and Dept of Mechanics Beijing University Beijing China |
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| Institution: | Joseph H. W. LEE C. P. KUANG
and G. Q. CHEN
"Dept. Of Civil Engineering,University of Hong Kong,Hong Kong,China
Depatment of River & Horbour Engineering,Nanjing Hydraulic Research Insstitule,Nanjing 210024,China 'Centrefor Envronmental Sciences and Dept. of Mechanics,Beijing University,Beijing 100871,China |
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| Abstract: | |
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| Keywords: | turbulent jet crossflow advected line puff mixing concentration dilution double-vortex momentim added mass self-similarity turbulence modeling bifurcation environmental fluid mechanics |
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