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国家自然科学基金(10572084)

作品数:7 被引量:66H指数:5
相关作者:王道增钟宝昌张燕樊靖郁李彬更多>>
相关机构:上海大学更多>>
发文基金:国家自然科学基金上海市教育委员会重点学科基金上海市浦江人才计划项目更多>>
相关领域:理学水利工程环境科学与工程动力工程及工程热物理更多>>

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7 条 记 录,以下是 1-10
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Experimental and Large-Eddy Simulation Studies on Three-Dimensional Vortices Produced by an Impinging Transverse Jet
<正>The flow pattern and entrainment feature of highly three-dimensional vortices produced by an impinging jet ...
J.Y.Fan~1
关键词:CROSSFLOW
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LARGE-EDDY SIMULATION OF THREE-DIMENSIONAL VORTICAL STRUCTURES FOR AN IMPINGING TRANSVERSE JET IN THE NEAR REGION被引量:8
2007年
The three-dimensional vortical structures for an impinging transverse jet in the near region were numerically investigated by means of Large-Eddy Simulation (LES). The LES results reproduced the skewed jet shear layer vortices close to the jet nozzle and the scarf vortex in the near-wall zone in good agreement with the experimental observations. Different vortical modes in the skewed jet shear layer close to the jet nozzle were identified depending upon the velocity ratio between jet and crossflow, namely changing from an approximately axisymmetric mode to a helical one with the velocity ratios varying from 20 to 8. Moreover, the scarf vortex wrapped around the impinging jet in the near-wall zone showed distinct asymmetry with regard to its bilateral spiral legs within the near region. And the entrainment of the ambient crossflow fluids by the scarf vortex in the near-wall zone was appreciably influenced by its asymmetry and in a large part occurred on the surface of the spiral roller structures in the course of spreading downstream.
FAN Jing-yuZHANG YanWANG Dao-zeng
关键词:CROSSFLOWENTRAINMENT
横流冲击射流尾迹涡结构的实验研究被引量:7
2005年
本文采用LIF(激光诱导荧光)流动显示和PIV(粒子图像速度场仪)测量对横流冲击射流的尾迹涡结构进行了实验研究。水槽实验是在三种流速比和两种冲击高度实验工况下进行的。由实验结果可得到两种明显的尾迹涡结构、即射流尾迹涡和横流尾迹涡。横流冲击射流中形成的主要尾迹涡结构主要依赖于流速比。本文还对横流冲击射流近区范围内射流尾迹涡和横流尾迹涡的形成机理和演化特征进行了分析。
张燕张燕樊靖郁
关键词:冲击射流
液固两相横射流流场结构和颗粒分布的PDA测量
采用激光粒子动态分析仪(PDA)对液固两相横射流的流场结构和颗粒分布特性进行了详细的实验测量.实验测量得到了不同流速比 R 条件下(2≤R≤10),液固两相在不同区域内的平均速度、湍流度和颗粒浓度分布.实验结果表明在典型...
樊靖郁王道增徐松立
关键词:液固两相流流场结构
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两相横射流的颗粒沉降和流场特性实验研究
<正>采用流动显示技术和PDA测量,对不同固相参数(包括颗粒尺寸D和质量载荷φ)和流动条件(流速比R)下,含颗粒横射流近区范围内的颗粒沉降和液相流场特性进行了水槽实验研究。观测了两相射流中所含颗粒(颗粒尺寸D=300,5...
王道增樊靖郁
关键词:流场特性PDA测量
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浅水横流中异重冲击射流的大尺度涡结构被引量:3
2006年
采用RNG湍流模型对浅水横流中异重冲击射流的大尺度涡结构进行了详细的数值研究.分析了冲击区滞止点上游壁面涡结构和近区Scarf涡结构的尺度、形成机理和演化特征.计算得到了上游壁面涡的特征尺度,结果表明上游壁面涡具有高度的三维性,其特征尺度依赖于流速比和环境水深.近区Sarf涡结构对横流冲击射流的横向浓度分布具有重要的影响.当流速比相对较小时,在底层壁射流与环境横流的横向边界附近出现明显的高浓度聚集现象,计算结果表明Scarf涡结构对这一高浓度聚集区的形成起主导作用.
樊靖郁王道增张燕戴世强(推荐)
关键词:冲击射流
上海长江口陈行水库泥沙沉降率研究
陈行水库位于长江口河段,是上海市新开辟的第二水源地。陈行水库抽引长江水,不可避免地含有以悬移质为主的泥沙,泥沙本身的运动及其对污染物的吸附、解吸作用对水质有重要影响。本研究通过实验研究和数值模拟研究了陈行水库中泥沙的沉降...
王道增樊靖郁钟宝昌
关键词:水库悬浮泥沙去除率
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EXPERIMENTAL STUDY ON THE VORTEX FORMATION AND ENTRAINMENT CHARACTERISTICS FOR A ROUND TRANSVERSE JET IN SHALLOW WATER被引量:7
2009年
The vortex formation and entrainment characteristics for a round transverse jet in shallow water were experimentally investigated by means of a combination of LIF flow visualization and PIV measurement. A scarf vortex wrapped around the main body of the jet is formed in the near-wall region due to the interaction between the resulting wall jet and sufficiently shallow crossflow, with some more or less unsteady flow properties and with spreading ranges as functions of both the velocity ratio and the water depth within the near field. The entrainment of the ambient crossflow fluid into the jet main body is closely associated with the time-evolving features of the shear layer between the jet and surrounding fluid as well as the induced vortical structures near the wall. In the case of slight impingement upon the wall, the interaction between the jet shear layer and the weak, unstable scarf vortex gives rise to an appreciable local entrainment enhancement, confined in the near-wall region in the vicinity of the stagnation point. While in the case of intense impingement upon the wall, the well-organized and stable scarf vortex gives rise to a greatly enhanced entrainment and a greatly increased lateral spreading rate nearly throughout the overall near field as compared to the conventional wall jet. In addition, the entrainment of the ambient crossflow fluid by the scarf vortex in this case occurs largely on the surface of the unique spiral roller structure by itself due to the presence of smaller and unorganized eddies, and accordingly the scarf vortex is likely to keep its spiral roller structure steadily to a relatively great downstream distance within the near field.
FAN Jing-yuZHANG YanWANG Dao-zeng
关键词:ENTRAINMENT
风对河道溢油扩展、漂移影响的实验研究被引量:12
2008年
本文通过风水槽实验,模拟了在不同风速,水流速度条件下油膜的扩展、漂移运动状况。分析研究了不同工况下风对溢油油膜扩展、漂移的影响。实验结果表明:无论是对于瞬时溢油还是连续溢油,风都能使得溢油油膜扩展尺度增加两倍左右;风与水流同向时,风速的变化对于瞬时溢油油膜的扩展尺度影响很小,对连续溢油油膜的扩展尺度随风速增加而增加;风与水流反向时,油膜的扩展尺度与风速和水流速度之间相对大小有关。对于漂移过程,无论是瞬时溢油还是连续溢油,其顺风边缘都随风速的增加而速度加快。
郭运武刘栋钟宝昌王道增
关键词:漂移风效应
分置式浮选试验装置微气泡尺寸和分布特性的PDA测量
<正>对一种分置式浮选试验装置的气液两相流场进行了实验研究,采用PDA测量了给定的水流流量(Q水=18m~3/h)、不同充气量(Q气=50~400m~3/h)条件下,微泡浮选试验装置内微气泡(直径小于0.5 mm)尺寸和...
樊靖郁王道增
关键词:浮选微气泡PDA测量
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