nlwxpearo
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 Posted: Wed 13:03, 05 Jan 2011 Post subject: Lijiaxia double layout of the operation of hydraul |
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Lijiaxia double layout of the operation of hydraulic turbine
43L / s only when the total infiltration 1300L / a of ten thousandths. (2) from the dam sealing peripheral joints destruction can be found, L panel seal damage elevation 128 ~ 129m, I9,[link widoczny dla zalogowanych], L are panel seal damage and elevation of 100m or more. In the river bed in a few panels (~ I bite),[link widoczny dla zalogowanych], is the basis for the end of the bottom elevation (93.0m), the longest length of a few panels, a cushion if the penetration seal damage deformation, these panels should be more obvious,[link widoczny dla zalogowanych], but the fact the contrary,[link widoczny dla zalogowanych], these panels intact. (3) Dam observation instrument the original five osmotic pressure, due to construction damage and theft of cables and other reasons, 4 not put observations. The remaining one instrument observed in March 1991 only. (Leakage in the dam was 308 or less) as a point of using data to infer the individual situation of the dam cushion would have a one-sided. 4 more than a few worth exploring bridge on the trees causes dam seepage analysis is preliminary, but the lessons learned are profound. Also shows that we need on the concrete face rockfill dam design and construction of necessary. 4.1 Dam Bridge flat deformation from the trees and some other similar reservoir dam abutment deformation situation, its value is relatively large. Than the original values with the theoretical calculation and practical experience in the estimated values are large, which is the basic cause of dam leakage. Thus, in theory how to make it closer to the actual results, is an important research topic. Is to study how to make the calculation more realistic boundary conditions. How to give full consideration in the design of the dam abutment deformation, to take the necessary measures to corresponding engineering, is another important issue. Construction, construction technology and adopt better methods of quality control to ensure accurate implementation of design requirements, can not be ignored. Attention abutment deformation observations, the theoretical research, project management to provide a scientific basis, is another aspect must be strengthened. As a special case, posted on both sides of the dam slope panel (interconnect) on the impact of dam deformation of how worthy of further exploration. If the drainage system under the interconnect, the water by the dam to the downstream row cushion area, and its impact on how stable cushion area, is worth studying. 4.2 The importance of reservoir blowdown conditions Zhushuqiao Reservoir Dam on the leakage detection, treatment for a long time are carried out under water, the reservoir is mainly the lack of necessary conditions for simple emptying. Coupled with the impact of dam blanket, not by diving survey of underwater photography and other means to directly find the leakage point; so that projects can not receive timely treatment. From this situation, the design of reservoirs emptying conditions is essential. 4.3 CFRD dam transition zone under the existing norms, the role of interlayer water dam and hydraulic transition. According Zhushuqiao reservoir damage situation, if the filter transition region has a role in the cushion area of infiltration and sabotage will be effectively controlled,[link widoczny dla zalogowanych], or at least reduce the extent of the damage the dam panel. This is not difficult to design and construction are done, and will increase another kind of dam safety insurance, should be looked into. (Continued from page 6o) The term unit load in the vibration area and a small regional operation, operating conditions of the poor, on the draft tube increases pressure pulsation of great influence, it would also stimulate the destruction of the turbine components, such as cavitation, blade crack, open seam welding, and so stanch ring. Lijiaxia hydro-generating unit of operation, the load allocation, should take full account of the different units in the operating condition, follow the layout of the hydraulic characteristics of double units and its laws, after a reasonable load distribution, as much as possible so that turbine to run at high efficiency region, to achieve full play to the good characteristics of high-performance wheels, improve water utilization, the maximum possible extend the life of the various components of the target. Currently, Lijiaxia design upstream water level has reached the normal level, the unit has reached the rated output, however, double the normal operation of head unit under test is not stability, plant-based vibration testing is not carried out under the test from the low-head results and the actual operation of the unit double point of view, very necessary as soon as possible under the double head unit is running tests on a real machine unit to obtain double comprehensive information on running for Lijiaxia the safety of hydro-generating unit provide more reliable and stable operation basis.
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