TAILIEUCHUNG - Hydrodynamics Optimizing Methods and Tools Part 9

Tham khảo tài liệu 'hydrodynamics optimizing methods and tools part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 228 Hydrodynamics - Optimizing Methods and Tools The F E system was represented as a network of interconnected component elements namely Reservoirs representing the lock chambers WSBs the lake and the oceans. Level-Area relations were specified for each one of them. The lake and oceans were considered as infinite area constant level reservoirs. Rigid rectangular pipes representing primary and secondary culverts WSB conduits etc. The calculation of friction losses was made using Darcy-Weisbach and ColebrookWhite equations as a function of the flow Reynolds number and the effective roughness height of the conduit walls. Local energy losses parameterized with a cross-section area and a head loss coefficient representing most of the special hydraulic components such as bends bifurcations transitions etc. Local energy losses expressed as laws for cross-section area and head loss coefficient in terms of a control parameter representing valves for which the control parameter is the aperture. Numerical modeling of physical model The Third Set of Locks has been subject to physical modeling both during the development of the conceptual design and later during the design for the final project. Both physical models where commissioned to the Compagnie Nationale du Rhône CNR Lyon France. The physical models were built at a 1 30 scale comprising 2 chambers and one set of three WSBs. Extensive tests were made for various normal and special operations measuring water levels discharges pressures and water slopes in the chambers. Some tests included the presence of a design vessel model measuring hydraulic longitudinal and transversal forces over its hull. Based on these tests a correlation between forces on the ship and water surface slopes in the chamber in the absence of the ship easier to measure and allegedly more repeatable was established. This correlation was used to impose maximum values to the longitudinal and lateral water surface slopes as contractual requirements. .

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