Optimization method of unsteady flow model of pressure pipeline water delivery system
A technology for water delivery systems and pressure pipelines, which is applied in the field of optimization of unsteady flow models for water delivery systems in pressure pipelines
Active Publication Date: 2017-06-13
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology
[0010] The purpose of the present invention is to provide a method for optimizing the unsteady flow model of the pressure pipeline water delivery system, thereby solving the aforementioned problems existing in the prior art
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[0057] The optimization method of the unsteady flow model of the pressure pipeline water delivery system described in this embodiment, the method includes:
[0058] First, obtain the pressurized pipe section in the pressure pipeline water delivery system, adjust the water hammer wave velocity of the pressurized pipe section with the shortest water hammer wave propagation time, and obtain the maximum time step Δt max , calculate and obtain the maximum time step Δt max The minimum segment number N of the corresponding shortest pressurized pipe segment 0min ;
[0059] Then, through the minimum number of segments N 0min Calculate the minimum wave velocity adjustment range f of any other pressurized pipe section i imin And the minimum wave velocity adjustment range f imin The corresponding optimal segment number N i最优 ;
[0060] Finally, adjust the magnitude f by the minimum wave velocity imin , adjust the water hammer wave velocity to ensure that the total time for the wate...
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The invention discloses an optimization method of an unsteady flow model of a pressure pipeline water delivery system, and relates to the technical field of hydraulic engineering. The optimization method of the unsteady flow model of the pressure pipeline water delivery system includes: acquiring pressed pipe sections in the pressure pipeline water delivery system, adjusting the water-hammer wave velocity of the pressed pipe section shortest in water-hammer wave propagation time, acquiring the maximum time increment Delta tmax, and calculating the minimum subsection number N0min of the shortest pressed pipe section corresponding to the maximum time increment Delta tmax; calculating the minimum wave velocity adjustment range fimin of arbitrary pressed pipe sections i except the shortest pressed pipe section and the optimal subsection number Ni-optimum corresponding to the minimum wave velocity adjustment range fimin; adjusting the water-hammer wave velocity through the minimum wave velocity adjustment range fimin, and guaranteeing that total time of propagating water-hammer waves from a starting point of the pressure pipeline water delivery system to an end point of the pressure pipeline water delivery system does not change before and after adjustment. Compared with traditional methods, the optimization method of the unsteady flow model of the pressure pipeline water delivery system significantly decreases the wave velocity adjustment range of the pressure pipeline water delivery system.
Description
technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to an optimization method for an unsteady flow model of a pressure pipeline water delivery system. Background technique [0002] Long-distance water delivery projects are characterized by long water delivery pipelines, undulating topography, and complex flow conditions. There are many influencing factors in the simulation calculation of the transition process. Pressure, temperature, etc. Calculation model factors including time step selection and calculation method adopted are also crucial. When calculating the transient flow of long-distance water pipelines, the value of the time step is one of the important factors affecting the calculation results of the hydraulic transition process. If the value of the time step is too large, it cannot meet the calculation accuracy requirements, and the solution of the equation is difficult to achieve Stable; if the value ...
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 雷晓辉杨迁田雨王超廖卫红王浩蒋云钟韩松
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES