共查询到20条相似文献,搜索用时 15 毫秒
1.
TIAN Zi qinSenior Engineer Design Institute Changjiang Water Resources Commission Wuhan China LIU Jing wang Professor Design Institute Changjiang Water Resources Commission Wuhan China 《人民长江》2001,(Z1)
1 IntroductionOperatingstabilityistheimportantguaranteeofatur bogeneratorunit slong termandsafeoperation.Theturbo generatorunitoftheThreeGorgeshydropowerstationisoneofthelargestturbogeneratorunitsintheworld,withitsturbine sratedoutputof 710MW,maximumoutpu… 相似文献
2.
XU De-longSenior Engineer Hydrology Bureau of Changjiang Water Resources Commission Wuhan China XIONG MingProfessor-senior Engineer Hydrology Bureau of Changjiang Water Resources Commission Wuhan China ZHANG JingEngineer Hydrology Bureau of Changjiang Water Resources Commission Wuhan China 《人民长江》2002,(Z1)
1 NaturalGeographicalConditionsPoyanglakeislocatedinthenorthpartofJiangxiProv inceandtothesouthofChangjiangRiver.ItreceiveswaterfromGanjiang ,Fuhe ,Xinjiang ,RaoheandXiushuirivers(referredtoasfive -rivershereafter)ofthelakesystemandwaterfromBoyang ,Zhangand… 相似文献
3.
V. I. Grech 《Power Technology and Engineering (formerly Hydrotechnical Construction)》1976,10(11):1060-1068
1. | The hydraulic projects awarded prizes by the Council of Ministers of the USSR in 1976 solve a set of critical national-economic problems and are distinguished by high cost effectiveness. |
2. | Structures distinguished by originality and progressiveness of technical solutions, which ensure their reliable operation, have been constructed as the result of a set of scientific-research and design studies. This was made possible only by the close creative understanding and interaction between the scientific-research, planning, construction, and operating organizations. |
3. | In building hydraulic structures, all the more attention is focused on industrial aesthetics. The architectural-planning solutions of the prizewinning projects are new, represent examples of the progressive development of industrial architecture, and have obtained widespread public recognition. |
4. | The bold and economic solutions relative to the organization of the passage of flood waters over incomplete structures merit attention; this makes it possible to reduce the volumes of the enclosing foundation pits of the cofferdams, or eliminate them entirely. |
5. | The experience gained with the design and construction of the prizewinning projects should be studied in detail and publicized for purposes of utilization in subsequent design and construction. |
4.
A. N. Marchuk A. R. Abakarov A. M. Kurakhmaev 《Power Technology and Engineering (formerly Hydrotechnical Construction)》1998,32(7):368-373
Conclusions
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 7, pp. 6–10, July, 1998. 相似文献
1. | The off-design operating regime of the Chirkey hydrostation with difficulties in producing electricity and with long periods of high upper pool levels under conditions of seismic activity negatively affects the reliability of the surrounding rock mass and should be brought into correspondence with the design. |
2. | Long and nonuniform operation of the Chirkey hydrostation outlet in 1997 showed sufficient reliability and efficiency of the structures, but activated negative processes in the surrounding rocks masses. The rupture of two rock bolts supporting the unstable mass on the left bank and increase of the rate of settlement of the left wall of the canyon are a warning signal. This requires a thorough examination of all support members and development of outlet operating rules. |
3. | The consequences of the operation of the outlet for the reliability and stress-strain state of the dam sould be specially and comprehensively studied and analyzed. It is urgently required to determine the forces in the rock bolts supporting the unstable mass, to determine the magnitude and places of maximum stresses in the dam, and to monitor the rate of movement of the left-bank slope. |
4. | It is urgently necessary to organize appropriate seismometric monitoring on the dam and to obtain daily (weekly) bulletins of the Dubka seismic station and periodic reports of the OMP DNTs on the seismological situation in the region. |
5. | Before organizing seismometric monitoring on the dam or geodynamic test area of the Center of the Geodynamic Observation Service in the Electric Power Industry, it is necessary to use the earthquake prediction method of the Joint Institute of Physics of the Earth with the help of the dam's existing measuring systems. For this purpose it is advisable to automate the reversed plump lines by the “Sibgeoinform” or DIGéS (Diagnosis of Hydraulic, Power, and Other Essential Structures) method and to increase the accuracy and frequency of seepage observation. |
5.
In this study, the hydromechanical behavior of a concrete fracture under coupled compressive and shear stresses was investigated. A special experimental device was designed to create a planar fracture in a cylindrical sample and to carry out different kinds of hydromechanical tests on the fracture. Four series of laboratory tests were performed on an ordinary concrete sample. Hydrostatic compression tests were first conducted to characterize the normal compressibility of the fracture. In the second series, direct shear tests were conducted on the fracture under different normal stresses. The maximal shear stress of the fracture was determined as a function of the normal stress. In the third series, fluid flow tests were carried out in view of characterizing the overall hydraulic conductivity of the fracture as a function of its opening and closure. Shear tests with a constant fluid pressure were finally performed to investigate the influence of fluid pressure on the deformation behavior of concrete fractures. Based on the experimental investigation, an elastoplastic model is proposed. This model takes into account the nonlinear elastic behavior of a fracture under normal compression and the plastic deformation and failure due to shear stress. The model was coupled with the classical Darcy's law to describe the fluid flow along the fracture by considering the variation of permeability with fracture aperture. Numerical results agree with experimental data from various laboratory tests. 相似文献
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WANG Che-huaSenior Engineer Changjiang River Water Environmental Monitoring Center Wuhan China PENG BiaoSenior Engineer Changjiang River Water Environmental Monitoring Center Wuhan China 《人民长江》2002,(Z1)
1 StudyAreasandStudyMethodology1.1 SamplingAreasandSampleTypesAllthesampleswerecollectedfrommainstemcross-sectionsandnearshorewatersof 2 2majorcityriverreachesofPanzhihua ,Yibin ,Luzhou ,Chongqing ,Fuling ,Wanx ian ,Yichang ,Shashi,Yueyang ,Wuhan ,Ezhou ,Huang shi,J… 相似文献
8.
Velikhov E. P. 《Power Technology and Engineering (formerly Hydrotechnical Construction)》1994,28(3):130-131
Power Technology and Engineering - 相似文献
9.
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. 相似文献
10.
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. 相似文献
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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. 相似文献
13.
《Water science and technology》1998,37(4-5):1-8
“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. 相似文献
14.
《水动力学研究与进展(A辑)》1986,(1)
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. 相似文献
15.
《水动力学研究与进展(B辑)》1996,(2)
JournalofHydrodynamicssponsoredbyChinaShipScientificResearchCenterPekingUniversityInstituteofWaterConservancyandHydroelectric... 相似文献
16.
《水动力学研究与进展(B辑)》1997,(2)
ChinaShipScientificResearchCenterPekingUniversityInstituteofWaterConservancyandHydroelectricPowerResearchShanghaiJiaotongUniversityFudanUniversityZhejiangUniversityTsinghuaUniversityZhongshanUniversityHuazongUniversityofScienceandTechnologyWuhanlnstituteofWaterTransportationEngineeringNorth--WesternPolytechnlcalUniversityDalianUniversityofTechnologyNuclearPowerInstituteofChinaShanghailnstituteofAppliedMathematicsandMechanicsHohaiUniversitySichuanUnionUniverstyofScienceandTe… 相似文献
17.
《水动力学研究与进展(B辑)》1998,(2)
China Ship Scientific Research Center Peking University Institute of Water Conservancy and Hydroelectric power Research Shanghai Jiaotong University Fudan University Zhejiang University Tsinghua University Zhongshan University Huazhong University of Science and Technology Wuhan Transportation University. 相似文献
18.
Li Da-mei Wang Xiang-san Wuhan University of Hydraulic anid Electric Engineering Wuhan P.R.China 《水动力学研究与进展(B辑)》1992,(3)
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. 相似文献
19.
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. 相似文献
20.
Min Khaing 《小水电新闻》2006,23(4):21-24
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. 相似文献