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首页> 外文会议>Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research >2D TURBULENT JET STUDY BASED ON FLUENT
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2D TURBULENT JET STUDY BASED ON FLUENT

机译：基于流利的2D湍流喷射研究

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摘要

The commercial CFD software FLUENT was introduced to study the flow charac-teristics of 2D vertical turbulent jet which was under the defined water depth and stagnant environ-ment. The VOF method based on FLUENT was adopted to trace the free surface. Cases with different jet velocity and pipeline length were studied. The analysis of the entire flow filed distribution showed that the free surface had little influence to the initial jet discharge region where the velocity retained the self-similar properties. When the jet achieved the free surface, the centerline velocity decreased rapidly and the flow was deflected by the surface. The fitted curve of the centerline velocity decay law was agreement with the theory curve which obtained by Chen & Rodi in 1980, but there was a lit-tle bit different about the range of variable. Because of the impact of the symmetrical vortex, jet ve-locity would have a peak in the jet exit. Compared to the free turbulent jet, cases with different types of riser were set to simulate the confined jet which was much closer to the reality project. A confme-ment index α=Hr/(Dr-D) was proposed to categorize the confined jet. It was found that the jet ap-pears instability characteristic when 1.67 ≤α≤5. For α≥7.5, the jet was highly confined and there was no ambient water entered the riser. For α≤1.15, the confinement has little or no effect to the jet.
机译：介绍了商业CFD软件流畅，研究了2D垂直湍流喷射的流动性Charac-Teristics，其在限定的水深和停滞环境下。采用基于流利的VOF方法来追踪自由表面。研究了不同喷射速度和管道长度的案例。对整个流动的分布的分析表明，自由表面对初始喷射放电区域几乎没有影响，其中速度保持自相似性质。当射流实现自由表面时，中心线速度快速降低，并且流动被表面偏转。中心线速度衰减法的拟合曲线与1980年陈志国获得的理论曲线一致，但在变量范围内有一个点亮的位置。由于对称涡旋的影响，Jet Ve-Locity将在喷射出口中具有峰值。与自由湍流射流相比，采用不同类型提升管的情况被设定为模拟狭窄的喷射，这更接近现实项目。提出了一个组合索引α= HR /（DR-D）以对限制喷射进行分类。发现射流AP梨在1.67≤α≤5时不稳定特性。对于α≥7.5，喷射率高度限制，并且没有环境水进入提升管。对于α≤1.15，限制对喷射几乎没有或没有影响。

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