Prediction of Hydraulic Stability of Francis Turbines of Three Gorges Hydropower Station

1　ＩｎｔｒｏｄｕｃｔｉｏｎＯｐｅｒａｔｉｎｇｓｔａｂｉｌｉｔｙｉｓｔｈｅｉｍｐｏｒｔａｎｔｇｕａｒａｎｔｅｅｏｆａｔｕｒ ｂｏｇｅｎｅｒａｔｏｒｕｎｉｔ ｓｌｏｎｇ ｔｅｒｍａｎｄｓａｆｅｏｐｅｒａｔｉｏｎ．Ｔｈｅｔｕｒｂｏ ｇｅｎｅｒａｔｏｒｕｎｉｔｏｆｔｈｅＴｈｒｅｅＧｏｒｇｅｓｈｙｄｒｏｐｏｗｅｒｓｔａｔｉｏｎｉｓｏｎｅｏｆｔｈｅｌａｒｇｅｓｔｔｕｒｂｏｇｅｎｅｒａｔｏｒｕｎｉｔｓｉｎｔｈｅｗｏｒｌｄ，ｗｉｔｈｉｔｓｔｕｒｂｉｎｅ ｓｒａｔｅｄｏｕｔｐｕｔｏｆ 710ＭＷ，ｍａｘｉｍｕｍｏｕｔｐｕ…     

Analysis of Hydrologic Property of Poyang Lake

1　ＮａｔｕｒａｌＧｅｏｇｒａｐｈｉｃａｌＣｏｎｄｉｔｉｏｎｓＰｏｙａｎｇｌａｋｅｉｓｌｏｃａｔｅｄｉｎｔｈｅｎｏｒｔｈｐａｒｔｏｆＪｉａｎｇｘｉＰｒｏｖ ｉｎｃｅａｎｄｔｏｔｈｅｓｏｕｔｈｏｆＣｈａｎｇｊｉａｎｇＲｉｖｅｒ.ＩｔｒｅｃｅｉｖｅｓｗａｔｅｒｆｒｏｍＧａｎｊｉａｎｇ ,Ｆｕｈｅ ,Ｘｉｎｊｉａｎｇ ,ＲａｏｈｅａｎｄＸｉｕｓｈｕｉｒｉｖｅｒｓ(ｒｅｆｅｒｒｅｄｔｏａｓｆｉｖｅ -ｒｉｖｅｒｓｈｅｒｅａｆｔｅｒ)ｏｆｔｈｅｌａｋｅｓｙｓｔｅｍａｎｄｗａｔｅｒｆｒｏｍＢｏｙａｎｇ ,Ｚｈａｎｇａｎｄ…     

State of the “dam-foundation” system during operation of the outlet of the chirkey hydroelectric station

Conclusions  

Analysis of Micro Organic Compound Pollution in Major City River Reaches of the Main Stem of the Changjiang River

1　ＳｔｕｄｙＡｒｅａｓａｎｄＳｔｕｄｙＭｅｔｈｏｄｏｌｏｇｙ1.1　ＳａｍｐｌｉｎｇＡｒｅａｓａｎｄＳａｍｐｌｅＴｙｐｅｓＡｌｌｔｈｅｓａｍｐｌｅｓｗｅｒｅｃｏｌｌｅｃｔｅｄｆｒｏｍｍａｉｎｓｔｅｍｃｒｏｓｓ-ｓｅｃｔｉｏｎｓａｎｄｎｅａｒｓｈｏｒｅｗａｔｅｒｓｏｆ 2 2ｍａｊｏｒｃｉｔｙｒｉｖｅｒｒｅａｃｈｅｓｏｆＰａｎｚｈｉｈｕａ ,Ｙｉｂｉｎ ,Ｌｕｚｈｏｕ ,Ｃｈｏｎｇｑｉｎｇ ,Ｆｕｌｉｎｇ ,Ｗａｎｘ ｉａｎ ,Ｙｉｃｈａｎｇ ,Ｓｈａｓｈｉ,Ｙｕｅｙａｎｇ ,Ｗｕｈａｎ ,Ｅｚｈｏｕ ,Ｈｕａｎｇ ｓｈｉ,Ｊ…     

Performance of enviss? stormwater filters: results of a laboratory trial

An experimental study was undertaken by Monash University to develop and test enviss? stormwater treatment and harvesting technologies - non-vegetated filtration systems with an extremely low footprint. This paper focuses on the water quality and hydraulic performance of two systems tested over a 'year' of operation in a Melbourne climate: (1) REUSE enviss? filters, designed for stormwater harvesting systems for non-potable supply substitution, and (2) WSUD enviss? filters, developed to treat urban stormwater prior to discharge to downstream systems. The presence of chlorine as a disinfection agent proved to be very efficient for the removal of microorganisms in REUSE enviss? filters. WSUD enviss? filters had the benefit of providing an elevated nutrient treatment performance, due to an extended depth of filter media. However, nutrient outflow concentrations (total nitrogen (TN) in particular) were found to increase during the testing period. Also, extended dry weather periods were found to have a detrimental effect on the treatment performance of almost all pollutants for both filters (nutrients, Escherichia coli and heavy metals). Although hydraulic conductivity results indicated two or three sediment trap replacements per year are required to maintain filtration rates, it is expected that the compressed loading rate schedule overestimated this maintenance frequency.     

Numerical simulation of hemodynamic interactions of red blood cells in micro-capillary flow

The hemodynamic interactions of red blood cells （RBCs） in a microcapillary flow are investigated in this paper. This kind of interaction is considered as the non-contact mutual interaction of cells, which is important in the suspension flow of blood, but not sufficiently understood. The distributed Lagrange multiplier/fictitious domain method in the lattice Boltzmann framework is used to solve the suspension of the RBCs. The modification of the flow due to the cells, the dependence of the cell deformation on the flow and the cell-cell interaction via the fluid are discussed. It is revealed that the long-range hydrodynamic interaction with a long interacting distance, more than about 5 times of the RBC equivalent radius, mainly has effect on the rheology properties of the suspension, such as the mean velocity, and the short-range interaction is sensitive to the shape of the cell in the microcapillary flow. The flow velocity around the cell plays a key role in the cell deformation. In the current configuration of the flow and cells, the cells repel each other along the capillary.     

Optimization of parabolic bars for maximum Bragg resonant reflection of long waves

This paper presents an analytical solution for the problem of the long wave reflection by a series of artificial bars with parabolic configuration in terms of the associated Legendre functions. It is shown that both the reflection and transmission coefficients depend solely upon the number of bars, the dimensionless bar height, the dimensionless bar width and the dimensionless bar distance. Particularly, under the Bragg resonance condition, i.e., the distance between two adjacent bars is about half of the wavelength of the normal incident waves, the analytical solution for the peak Bragg resonant reflection is obtained, which reveals that the peak Bragg resonance depends upon the number of bars, the dimensionless bar height and the dimensionless bar width. Based on this solution, the optimization of the parabolic bars is made to obtain the maximum Bragg resonance and a group of optimal curves, which may be very useful in the design of Bragg breakwaters with parabolic bars.     

“Rosshelf” company and development of the arctic shelf of Russia

Power Technology and Engineering -     

Some physiological properties of an Italian isolate of “Microthrix parvicellai”

“Microthrir parvicella” strain RN1, isolated by micromanipulation from an activated sludge treatment plant in Italy, is phylogenetically identical to two other isolates from Australia. Our Italian isolate of “M. parvicella” is a slow growing (μmax ranging from 0.3 to 0.5 d^-1), aerobic organism that exhibits nutritional versatility, being able to utilize simple and complex compounds as carbon and nitrogen sources. In pure culture, the organism cannot grow anaerobically nor is it able to denitrify. Strain RN1 is able to grow both in aerobic and in microaerophilic conditions and this metabolic versatility could give it a metabolic advantage in the activated sludge milieu.     

A Method of Model Test for Studying Flow-induced Vibration of Hydraulic Structures

A model testing method for studying flow-induced vibration of hydraulic structures was developed. It was refered to as "the hydraulic test method of elastic model". Its similarity laws, model materials and data processing were studied in the paper. Both the general characteristics of flow-induced vibration and modal parameters of structure can be obtained by the proposed model testing method.     

Numerical study of the performance of multistage Scaba 6SRGT impellers for the agitation of yield stress fluids in cylindrical tanks

The 3-D flow fields and power consumption in a vessel stirred by multistage Scaba 6SRGT impeller have been investigated. The Xanthan gum solutions in water were used, which have a shear thinning behavior with yield stress. This study was carried out with the help of a CFD package(CFX 13.0, Ansys Inc.) which is based on the finite volume method to solve the momentum equations. The effects of stirring rate, fluid rheology, impeller number, impeller location and vessel size on the performance of such stirred system are presented. To validate the CFD model, our predicted results have been compared with other literature data and a satisfactory agreement has been found.     

Real time control of the sewer system of Boulogne Billancourt — A contribution to improving the water quality of the Seine

Confronted with the problem of overflows from its combined sewer system into the River Seine during rainfall, the Department of the Hauts de Seine (which covers some thirty urban districts on the west side of Paris) has decided to implement the real time control of its sewer system. To initiate this plan, as the town of Boulogne Billancourt seemed to be a particularly favourable site for the use of such techniques, a project to control its sewer system in real time has been implemented within the scope of the SPRINT 226 programme financed by the European Community.The preliminary studies, based on a MOUSE computer model of the sewer system, showed that the real time control of the sewer network under study had a high potential benefit, since it would allow an 80% reduction of the volumes of waste water discharged into the Seine annually in the study zone. Following on from these encouraging results, the installation of a complete real time control system was set in hand. The system, at present undergoing testing and evaluation, consists principally of a MOUSE ON LINE real time model and a system for forecasting rainfall by means of radar images.     

Journal of Hydrodynamics sponsored by

China Ship Sclentlflc Research venterPeking UniversityInstitute of Water Conservancy and Hydroelectric Power ResearchShanghai Jlaotong UniversityFudan UniversityZhejlang UniversityTsinghua UniversityZhongshan UniversityHuazong University ofsclence and且echnologyWuhan Institute of Water Transportation EngineeringNorth-Western Polytechnical UniversityDallan University of TechnologyNuclearPower Institute ofChlnaShanghai Institute of Applied Mathematics and MechanicsHobal Univers…     

Journal of Hydrodynamics sponsored by

China ShiP Seientifie Researeh CenterPeking UniversityInstitute of Water Con哭r、,aney and Hydroeleet了ie Power Re溉rehShanghai Jiaotong IJI飞宜ve路ityFudan UniversityZhejiang UniversityTsinghua UniversityZhongshan UniversityHuazhong University of Science and TechnologyWuhan Institute of Water TransPortation Engineer加gNorth一W驾tern Polytechnical UniversityDalian Uni、rersity of TeehnologyNUClear Powet Institute ofC址naShanghai Instit-ute of APPUed MathemaUcs and Meeha川…     

Journal of Hydrodynamics sponsored by

ChinaShipScientificResearchCenter PekingUniversity InstituteofWaterConservancyandHydroelectricPowerResearch ShanghaiJiaotongUniversity FudanUniversity ZhejiangUniversity TsinghuaUniversity ZhongshanUniversity HuazongUniversityofScienceandTechnology WuhanInstituteofWaterTransportationEngineering North-WestemPolytechnicalUnivcrsity DalianUniversityofTechnology NuclearPowerInstituteofChina ShanghaiInstltuteofAppliedMaithematicsandMechanics …     

Detached-eddy simulation of wing-tip vortex in the near field of NACA 0015 airfoil

In the present study, the formation of the wing-tip vortex from a rectangular NACA0015 wing with a square tip at the Reynolds number of 1.8×105 and the angles of attack(AOA) α= 8o and 10o were simulated with an incompressible detached eddy simulation(DES) method and the Reynolds averaged Navier-Stokes(RANS) equations with the SA model respectively. Numerical results were compared with experimental results to validate the capability of the employed methods in resolving tip vortex flows. The results show that DES model could capture the complicated three-dimensional structures in the vortex, and the streamwise vorticity and the cross-flow velocity agree with the experiment results quite well, but RANS-SA model with the same grid as that of DES failed to capture the correct structures and under-predicted the streamwise vorticity in the vortex by 40%. The present study suggests that under the same calculation cost, DES but not RANS-SA could be used to effectively predict the flow characteristics in tip vortex.     

Application of Finite Element Method to the Analysis and Computation of Gradient current

In this paper the finite element method is used to solve the two-dimensional gradi-ent current problem,The solution is obtained by two-step explicit method.It is verified withgood agreement by the field data offered by Xiamen E.P.A.,Fujian,P.R.C.The authors rec-ommend that the proposed method is suitable for the analysis and computation of long waves ofepeiric sea at the seaward firth.     

Development of Hydropower In Myanmar

Water is the source of life and electricity is the symbol of modem civilization. The topography combined with heavy rainfall from the South-West monsoon endows the country with abundant hydropower resources. In the last two-decades, country＇s power supply system mainly depends on a number of gas turbine and combined cycle power plants, which requires relatively shorter implementation time and lower investment cost.