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The middle route the main channel in Numerical Simulation of unsteady flow

Author: ZhouQiong
Tutor: MaYueXianï¼›LiZhanSong
School: Zhengzhou University
Course: Water Resources and Hydropower Engineering
Keywords: The South Open channel flow Tube drainage combined Inertia head Method of characteristics Numerical Simulation
CLC: TV133.2
Type: Master's thesis
Year: 2007
Downloads: 254
Quote: 6
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Abstract


North Water Transfer Project to address China's water resources are unevenly distributed and seriously affect the economic development of the northern region and the construction of a super-large inter-basin, the grand project of strategic importance. Open channel water the the open aqueduct system, which is characterized by a larger water capacity beyond design; due to terrain or other reasons for building cross water diversion project in the long-distance water conveyance system nullah and the form of a combination of pressure pipeline; unsteady flow in open channels is often caused by the opening and closing of the gate or pumping stations and other human factors; hydraulic transition process required to meet the actual needs of conveyance, determined by system to various causes unsteady flow when the hydraulic elements along the lines in the water level, flow, flow velocity, water depth, flow and the variation with time, in order to design a more long-distance water conveyance system optimization, hydraulic transition process is a long widespread phenomenon in the distance water conveyance system. Unsteady flow numerical simulation calculation and analysis of the flow characteristics of the transition process, equipment design and operation of the water delivery system is of great significance. This thesis based on unsteady open channel flow theory, Henan section from the main canal of the Middle Route Project specific engineering, the complex connecting pipes for long-distance water conveyance system in the presence of multiple aqueducts, culverts, inverted siphon connection section open channel flow numerical simulation study, the impact of in-depth analysis and inertia head Roughness Selection final use conditions very highest water level projections and Control Barrier Gate way of change, the analysis of the surface of the water line changes, qualitative analysis of optimal scheduling way, in order to guide the scheduling of the actual project operation mode, the same time in order to better serve the practical engineering, visualization of numerical simulation studies, specifically will focus on the following aspects: 1. First establish simple prismatic channels open and close the gates in the design flow, unsteady flow mathematical model and using a variety of computational methods for the numerical simulation results were compared, the choice of the best calculation method. 2. Alternately lift hydraulic phenomenon comprehensive theoretical analysis of sluice sudden closure of the the enable channel flow rate caused by the sudden change in the water level. 3. From a Weiming drainage and pressure pipe unsteady flow continuity equation and equations of motion starting, a detailed exposition tube Drainage combination in the treatment of various types of boundary conditions; combined North Water Transfer Project period instance running on the downstream gate. condition changes in water depth in the downstream gate simulation. 4. Combination of one-dimensional unsteady flow system the inverted siphon import and export sectional energy loss from the energy point of view, the analysis of channels and pipes, whether to consider the impact of the pressure pipe inertia head compared and analyzed the sensitivity of selecting roughness on the surface of the water line . 5. Through the control of Border Gate way to change the boundary conditions, analysis of the surface of the water line change, qualitative analysis of optimal scheduling, reasonable guidance to the actual project scheduling operation mode. 6. Papers using Matlab language programming calculation, VisualBasic develop applications on the visual display sluice middle route the main channel in all the very operating conditions numerical simulation results. Finally a moment of segment operating results of the following four categories Drainage diagram: a) vs. time view of the cross-sectional flow b) cross-section water depth over time change in c) at some point of each section flow changes Figure d) water depth of each cross-section diagram

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CLC: > Industrial Technology > Hydraulic Engineering > The basic science of water resources project > Hydraulics > Canals, water mechanics > Unsteady flow
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