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Analysising Complete Characteristic Curves of Pump and Studying of the Impact on Hydraulic Transient of Long-distance, Large-diameter and Level Water-delivery Pipelines
Author: ShenXiaoRong
Tutor: YangYuSi
School: Chang'an University
Course: Municipal Engineering
Keywords: Hydraulic Transients Long Flat pipe Water Hammer Complete pump characteristic curve
CLC: TH38
Type: Master's thesis
Year: 2010
Downloads: 107
Quote: 0
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Abstract
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Long-distance water pipelines to transport water sources located farther to the towns, cities and towns to solve the water shortage and water-single issue, but long-distance water pipelines are mostly single or double tube, which runs security issues become water engineering important and difficult. The long-distance water pipelines flow state security problems often concentrated hydraulic transition process, according to the non-full water flow and a pressure force of the transition process theory, the fluid state, a mathematical model to analyze the factors affecting safe operation, issues affecting water safe irrigation flow line reaches the head of time, traffic safety regulation, safety without water and other engineering problems. Hydraulic Transients means that when the water from one stable state to another stable state, the transition between the two steady-state flow regimes. Water pipeline hydraulic transition process is the main security problems, only in the test water, running smooth hydraulic transition process established to protect the water supply pipeline safety. The most common and the most prominent problem is the long-distance water pipeline water hammer problem. (1), the system's introduction aqueduct hydraulic transient calculation of the basic principles of Water hammer brief description of the basic equations, the establishment of Water Hammer calculate the mathematical model (2), the pump characteristic curve analysis of all , outlining the complete pump characteristic curve in a computer simulation of the importance of water hammer calculation, focuses on the complete pump characteristic curve for long distance and large areas of pressure conduit hydraulic transition process. (3), the paper through the water hammer protection research, application of different specific speed pump full simulation using the pump characteristic curve, calculated in the same conditions, the application of computer language of the water hammer protection calculation procedures were stopped pumping water hammer calculation, Analysis of water hammer boost and pump hydraulic transition process in the operating conditions. (4), combined with the actual project, the following conclusions: In the absence of complete information on the complete pump characteristic curve case, the calculation of large diameter flat long distance pipeline pressure forces water Water hammer transition process, with the ratio of the number of revolutions similar to the same type of pump characteristic curves instead of using the whole entire characteristic curve of the pump water hammer calculation, the error can be controlled within the range, the results of the actual construction of hydraulic transient water hammer protection measures guiding significance. If you use more than the number of revolutions vary greatly, all the different types of pump characteristic curve Water hammer calculation results will cause a large deviation, affect the actual construction of the water hammer protection.
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