A LDA STUDY OF THE TURBULENT FLOW FIELD IN A BAFFLED VESSEL GENERATED BY A PTD AND A PTU

1.　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｐｉｔｃｈｅｄｂｌａｄｅｔｕｒｂｉｎｅｉｍｐｅｌｌｅｒｉｓｅｓｐｅｃｉａｌｌｙｅｆｆｉｃａｃｉｏｕｓｉｎｆｌｏｗｓｅｎｓｉｔｉｖｅｍｉｘｉｎｇｏｐｅｒａｔｉｏｎｓｓｕｃｈａｓｓｏｌｉｄｓｕｓｐｅｎｓｉｏｎ,ｓｏｔｈａ?..     

Design & Construction Progress and Prospect of TGP

Ｓｉｎｃｅｔｈｅｙｅａｒｏｆ195 0 ,ｔｈｅＣｈａｎｇｊｉａｎｇＷａｔｅｒＲｅｓｏｕｒｃ ｅｓＣｏｍｍｉｓｓｉｏｎ (ＣＷＲＣ)ｈａｓｂｅｅｎｒｅｓｐｏｎｓｉｂｌｅｆｏｒｔｈｅｓｕｒｖｅｙａｎｄｄｅｓｉｇｎｏｆｔｈｅＴＧＰｆｏｒｎｅａｒｈａｌｆｏｆａｃｅｎｔｕｒｙ .Ｏｎｔｈｅｂａ ｓｉｓｏｆａｌａｒｇｅａｍｏｕｎｔｏｆｉｎｖｅｓｔｉｇａｔｉｏｎ ,ｄｅｓｉｇｎａｎｄｓｃｉｅｎｔｉｆｉｃｒｅｓｅａｒｃｈ ,ｔｈｅＣＷＲＣｓｕｃｃｅｓｓｉｖｅｌｙｐｒｅｐａｒｅｄｔｈｅ“ＲｅｐｏｒｔｏｎＦｅａｓｉｂｉｌｉｔｙＳｔ…     

THE p-VERSION OF FINITE ELEMENT METHODS FOR STEADY VISCOELASTIC FLOWS BETWEEN ECCENTRIC ROTATING CYLINDERS

１．　ＩＮＴＲＯＤＵＣＴＩＯＮＢａｓｉｃａｌｌｙ，ｔｈｅｒｅａｒｅｔｗｏａｐｐｒｏａｃｈｅｓｔｏｉｍｐｒｏｖｅｔｈｅａｃｃｕｒａｃｙｏｆｆｉｎｉｔｅｅｌｅｍｅｎｔｓｏｌｕｔｉｏｎｓ：ｔｈｅｓｏｃａｌｌｅｄｈｖｅｒｓｉｏｎｅｍｐｌｏｙｓｌｏｗｅｒｏｒｄｅｒｉｎｔｅｒｐｏｌａｔｉｏｎｓａｎｄｐｒｏｇｒｅｓｓｉｖｅｌｙｒｅｆｉｎｅｓｔｈｅｍｅｓｈｅｓｗｈｉｌｅｔｈｅｓｏｃｏｌｌｅｄｐｖｅｒｓｉｏｎ（ｓｐｅｃｔｒｕｍｍｅｔｈｏｄ）ｕｓｅｓｌｏｃａｌｈｉｇｈｅｒｏｒｄｅｒｉｎｔｅｒｐｏｌａｔｉｏ…     

A HIGH RESOLUTION FINITE VOLUME METHOD FOR SOLVING SHALLOW WATER EQUATIONS

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｉｓｎｅｃｅｓｓａｒｙｔｏｃｏｎｄｕｃｔｆｌｕｉｄｆｌｏｗａｎａｌｙｓｅｓｉｎｍａｎｙａｒｅａｓ ,ｓｕｃｈａｓｉｎｅｎｖｉｒｏｎｍｅｎｔａｌａｎｄｈｙｄｒａｕｌｉｃｅｎｇｉｎｅｅｒｉｎｇ .Ｎｕｍｅｒｉｃａｌｍｅｔｈｏｄｂｅｃｏｍｅｓｇｒａｄｕａｌｌｙｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔａｐ ｐｒｏａｃｈ .Ｔｈｅｃｏｍｐｕｔａｔｉｏｎｆｏｒｇｅｎｅｒａｌｓｈａｌｌｏｗｗａｔｅｒｆｌｏｗ ｐｒｏｂｌｅｍｓａｒｅｓｕｃｃｅｓｓｆｕｌ,ｂｕｔｔｈｅｓｔｕｄｉｅｓｏｆｃｏｍｐｌｅ…     

BEARING FORCES OF EMERGENCY GATE DURING SHUTOFF

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＦｏｒａｈｙｄｒｏｐｏｗｅｒｓｔａｔｉｏｎｗｉｔｈａｌｏｎｇ ｄｉｓｔａｎｃｅｐｒｅｓｓｕｒｅｄｉｖｅｒｓｉｏｎｓｙｓｔｅｍ ,ｉｔｉｓａｌｗａｙｓｎｅｃｅｓｓａｒｙｔｏｃｏｎｓｔｒｕｃｔａｓｕｒｇｅｔａｎｋｉｎｏｒｄｅｒｔｏｒｅｄｕｃｅｅｘｃｅｓｓｉｖｅｗａｔｅｒｈａｍｍｅｒｐｒｅｓｓｕｒｅｒｅ ｓｕｌｔｅｄｉｎｔｈｅｄｉｖｅｒｓｉｏｎｓｙｓｔｅｍ [2 ,7] 　　 .Ｆｕｒｔｈｅｒｍｏｒｅ ,ｆｏｒｔｈｅｓａｆｅｔｙｏｆｔｈｅｄｏｗｎｓｔｒｅａｍｓｉｄｅｏｆｔｈｅｔａｎｋ ,ｉ…     

CHANGES OF MEAN VELOCITY PROFILES IN THE WAVE-CURRENT COMBINED FLOW

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｐｈｅｎｏｍｅｎａｏｆｗａｖｅ ｃｕｒｒｅｎｔｃｏｍｂｉｎｅｄｆｌｏｗａｒｅｖｅｒｙｃｏｍｍｏｎｉｎｅｓｔｕａｒｉｎｅａｎｄｃｏａｓｔａｌｚｏｎｅ .Ｔｈｅｃｏｍｂｉｎｅｄｍｏｔｉｏｎｏｆｗａｖｅａｎｄｃｕｒｒｅｎｔｃｏｎｔｒｏｌｓａｎｄａｆｆｅｃｔｓｍａｎｙｐｈｙｓｉｃａｌｐｒｏｃｅｓｓｅｓｉｎｏｆｆｓｈｏｒｅａｎｄｃｏａｓｔａｌｅｎｇｉｎｅｅｒｉｎｇ ,ｓｕｃｈａｓｓｅｄｉｍｅｎｔｔｒａｎｓｐｏｒｔ,ｐａｒｔｉｃｕｌａｒｌｙｔｈｅｓｕｓｐｅｎｄｅｄｓｅｄｉｍｅｎ…     

水利部长江水利委员会简介

ＴｈｅＣｈａｎｇｊｉａｎｇＷａｔｅｒＲｅｓｏｕｒｃｅｓＣｏｍｍｉｓｓｉｏｎ(ＣＷＲＣ) ,ｏｒｉｇｉｎａｌｌｙｎａｍｅｄＹａｎｇｔｚｅＶａｌｌｅｙＰｌａｎｎｉｎｇＯｆｆｉｃｅ(ＹＶＰＯ) ,ｗａｓｅｓｔａｂｌｉｓｈｅｄｉｎＦｅｂｒｕａｒｙ ,195 0 .Ａｓａｎａｓｓｉｓｔａｎｔｍｉｎｉｓｔｒｙｉｎａｄｍｉｎｉｓｔｒａｔｉｖｅｌｅｖｅｌ,ＣＷＲＣｉｓａｒｉｖｅｒｖａｌｌｅｙｏｒｇａｎｉｚａｔｉｏｎｄｉｓｐａｔｃｈｅｄｂｙｔｈｅＭｉｎｉｓｔｒｙｏｆＷａｔｅｒＲｅｓｏｕｒｃｅｓ (ＭＷＲ) ,ＰＲＣ .Ｉｔｉｓａｕｔｈｏ…     

NUMERICAL SIMULATION OF BED DEFORMATION IN DIKE BURST

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＲｉｖｅｒｓａｒｅｏｆｔｅｎａｔｔａｃｋｅｄｂｙｌａｒｇｅｆｌｏｏｄ .Ｗｈｅｎｗａｔｅｒｌｅｖｅｌｉｎｒｉｖｅｒｉｓｖｅｒｙｈｉｇｈ ,ｗｅａｋｅｒｐａｒｔｓｏｆａｄｉｋｅｗｉｌｌｂｅｄｅｓｔｒｏｙｅｄ .Ｔｈｅｐｒｏｔｅｃｔｅｄｌａｎｄａｎｄ ｐｒｏｐｅｒｔｉｅｓｗｉｌｌｂｅｓｕｂｍｅｒｇｅｄ .Ｓｏ ,ｉｔｉｓｏｆｉｎｓｔｒｕｃｔｉｏｎａｌｓｉｇｎｉｆｉ ｃａｎｃｅｆｏｒｄｅｃｉｓｉｏｎ ｍａｋｅｒｓｏｆｆｌｏｏｄ ｐｒｅｖｅｎｔｉｎｇｔｏｅｘａｃｔｌｙｐｒｅｄｉｃｔｔｈｅ…     

NUMERICAL SIMULATION OF TIP-CLEARANCE FLOW IN CASCADE

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＴｉｐ ｃｌｅａｒａｎｃｅｆｌｏｗｓｏｃｃｕｒｉｎｖａｒｉｏｕｓｅｎｇｉｎｅｅｒ ｉｎｇａｐｐｌｉｃａｔｉｏｎｓｓｕｃｈａｓａｘｉａｌ ｆｌｏｗ ｐｕｍｐｓａｎｄｄｕｃｔ ｅｄｐｒｏｐｅｌｌｅｒｓ .Ｔｈｅｉｎｅｒｔｉａｌｆｏｒｃｅｓａｃｔｉｎｇｕｐｏｎｔｈｅｆｌｕｉｄｉｎｔｈｅｎａｒｒｏｗ ｇａｐｂｅｔｗｅｅｎｂｌａｄｅｔｉｐａｎｄｔｈｅｓｕｒｒｏｕｎｄｉｎｇｗａｌｌａｒｅｓｕｆｆｉｃｉｅｎｔｔｏ ｇｅｎｅｒａｔｅａｔｉｐｌｅａｋａｇｅｖｏｒｔｅｘｏｎｔｈｅｓｕｃｔｉｏｎｓ…     

NUMERICAL SIMULATION OF TURBULENT FLOW THROUGH THROAT-TYPE ENERGY-DISSIPATORS

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＴｏｃｏｎｖｅｒｔａｄｉｖｅｒｓｉｏｎｔｕｎｎｅｌｉｎｔｏａｆｌｏｏｄｄｉｓ ｃｈａｒｇｅｔｕｎｎｅｌｃａｎｓａｖｅａｌａｒｇｅａｍｏｕｎｔｏｆｉｎｖｅｓｔｍｅｎｔ.Ｔｈｅｒｅａｒｅｍａｎｙｓｕｃｃｅｓｓｆｕｌｅｘａｍｐｌｅｓｉ     

ON INSTABILITY OF DILUTE FIBER SUSPENSIONS IN AN AXISYMMETRIC TAYLOR-COUETTE FLOW

1. INTRODUCTION The shear-driven flow between independently rotating concentric cylinders is named as Taylor- Couette flow after the standout work of Taylor in 1923 and his later research in this field. Since then,there have been alot of literatures relatedto this problem. Among them,the hydrodynamic in- stability of Taylor-Couette flowin the Newtonian fluid has been one of the most attractive topics . The review written by Tagg[1]has summarized these fruits .Inrecent years ,theinstabi…     

FIBER ORIENTATION DISTRIBUTIONS IN SLIT CHANNEL FLOWS WITH ABRUPT EXPANSION FOR FIBER SUSPENSIONS

The lattice Boltzmann method was used to investigate numerically the fiber orientation distributions in slit channel flows with abrupt expansion for fiber suspensions even in the concentrated regime. The channels have a thin slit geometry with 1：4 and 1：3 expansions. Both the interactions between fibers and that between fibers and channel walls were taken into consideration. Some of numerical results are qualitatively in agreement with the experiment data. It is found that most of fibers are aligned in the flow direction in all the suspensions in the entrance region of the expansion. Fiber orientation distributions, having different patterns in different regions of the flow, depend on the expansion ratio of the channel. The mechanical fiber-fiber interaction largely affects the fiber orientation in the downstream of the expansion and in the salient corner for the cases of concentrated suspensions. The hydrodynamic interaction plays an important role on the fiber orientation in the dilute suspension.     

Orientation of the fiber suspending in the flow through a tube containing a sphere

Fiber suspensions flow through a tube containing a sphere in the dilute and concentrated regimes is simulated numerically with the Lattice Boltzmann Method (LBM). The numerical results of fiber orientation distribution based on a statistical scheme are obtained and agree qualitatively with the experimental ones for the flow through a parallel plate channel containing a cylinder. The results show that the sphere in the tube results in a change in the fiber orientation distribution downstream of the sphere along the flow and transverse directions. The influences of the sphere on the fiber orientation distribution are more significant for the concentrated suspensions than for the dilute one. The effect of the initial fiber orientations on the fiber orientation distribution is significant upstream of the sphere but small downstream of the sphere.     

RESEARCH ON DISTRIBUTION FUNCTION AND ORIENTATION TENSORS OF FIBER SUSPENSIONS IN WEDGE-SHAPED FLOW FIELD

1. INTRODUCTIONUnderstanding the rheological behavior of nondilute fiber suspensions is currently of great interest both practically and theoretically. Whenever such a flow is formed, the fibers and the fluid act on each other. The existence and motion of…     

RESEARCH ON THE MIXING LAYER OF FIBER SUSPENSIONS AND DIRECT SIMULATION ON THE MOTION OF CYLINDRICAL PARTICLES

The mixing layer of fiber suspensions was simulated numerically with the spectral method and the fibers in the flow were traced individually with calculation. The corresponding experiments were made. The results show that the Stokes number of particles is the key parameter to determine the spatial distribution of fibers and the coherent structures control the orientation of fibers. Direct simulations of the motion of cylindrical particles were carried out via lattice Boltzmann method. It is found that the aspect ratio of particles has significant effects on the translation and rotation of the cylindrical particles. A new lattice Boltzmann method which is convenient to deal with the curved boundary is proposed.     

管流与明渠层流的总流机械能方程及机械能损失计算

管流与明渠流同属流体力学中的内流,其总流机械能方程在水力学中称为总流能量方程。现有水力学中的总流能量方程是以理想不可压缩液体的伯努利方程为基础得到的,无法得到总流机械能损失的表达式。该文作者曾直接从黏性不可压缩流体运动的控制方程出发分别得到了管流及明渠流的总流机械能方程,解决了以上问题。考虑到层流条件下明渠流自由表面的变形特点,该文在前述工作基础上,将管流及明渠流在层流条件下的总流机械能方程进行了统一,同时还分别计算了管流(圆管、不同长短半轴比的椭圆管、不同宽高比的矩形管和不同内外径比圆环管)及明渠流(不同宽深比的矩形明渠)在层流条件下的总流机械能损失系数。结果表明:在同一雷诺数条件下,圆管层流的总流机械能损失系数比椭圆管层流、矩形管层流、圆环管层流及较大宽深比的矩形明渠层流的机械能损失系数要小。     

THE ORIENTATION DISTRIBUTION OF FIBER SUSPENSIONS AND ITS EFFECT ON THE CONSTITUTIVE RELATIONSHIP

BRIEF INTRODUCTION OF THE PAPER:Under- standing the physical properties of fiber suspen- sions is currently of great interest in many areas . Different fromspherical particle suspensions ,the properties of fiber suspensions mostly rely on the orientation distribution of fibers due to their slen- der bodies .It is i mportant tostudythe particle ori- entation distribution of fibers suspensions during flows . In the dilute planar converging channel flow in laminar regi me , the Orienta…     

掺气水射流的空化及其应用

基于两相流体动力学的理论，建立空蚀射流切割装置中短管内的压力变化梯度的基本方程式；通过求解不同流速与不同掺气量时的短管内压力变化结果，分析了初始掺气率和水流流速对短管内压力坡降的影响；为增高水射流的切割效率提供理论依据；研究表明，若水流马赫数接近于1，短管内将产生巨大的压降，促使出口水流产生空化，通过利用高速水流并控制吸入适量空气，形成的空蚀流可提高水射流的切割效率。     

油-水两相流流型转换研究

本文根据钢管内油—水两相流流型特征，建立了新的油—水两相管流流型的转换准则。它包括：分层流型的稳定性准则、分散流型和混合流型的转换边界及反相界线。流型转换准则得到了白油—水和柴油—水两相流的流型实验验证，而与有机玻璃管里的油—水两相流型的分布有一定的差异，这种差异与P．Angli的不同管材时的流型对比实验结论一致。这些都表明本文的流型转换准则能很好的预测钢管内的油—水两相流流型，这对于油田混钻管路的设计和运行具有十分重要的经济价值。     

Optimal contract wall for desired orientation of fibers and its effect on flow behavior

The orientation of suspended fibers in the turbulent contraction is strongly related to the contraction ratio,which in some cases may be detrimental to the actual production.Here for a certain contraction ratio,the contraction geometry shape is optimized to obtain the desired fiber orientation.In view of the nonlinearity and the complexity of the turbulent flow equations,the parameterized shape curve,the dynamic mesh and a quasi-static assumption are used to model the contraction with the variable boundary and to search the optimal solution.Furthermore the Reynolds stress model and the fiber orientation distribution function are solved for various wall shapes.The fiber orientation alignment at the outlet is taken as the optimization objective.Finally the effect of the wall shape on the flow mechanism is discussed in detail.