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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/19118

Title: Numerical Modeling of Active Hydraulic Devices and Their Significance for System Performance and Transient Protection
Authors: Zhang, Qin Fen
Advisor: Karney, Bryan William
Department: Civil Engineering
Keywords: Active Hydraulic Device
Hydro Turbine
Non-Reflective Boundary
Issue Date: 23-Feb-2010
Abstract: The thesis numerically explores the use and behavior of Active Hydraulic Devices (AHDs), creating a new capability to simulate and control a pipe system’s transient performance. Automatic control valves are the first type of AHDs studied in this research. Due to the challenges inherent in the design of a pressure relief valve (PRV), the general principles of PRV use and selection are studied along with the system’s response to the PRV parameters. A new application of PID (proportional, integral and derivative) control valve is envisioned that combines a remote sensor at the upstream end of a pipeline to create a non- or semi- reflective boundary at the downstream end. Case studies show that, with such a boundary, the reflection and resonance of pressure waves within the pipeline are sometimes eliminated and invariably limited. The second type of AHDs studied in this research is the governed hydro turbine, the most complicated hydraulic component in terms of transient analysis and waterhammer control. A complete numerical model is developed for the turbine installations in either urban water networks or conventional hydropower generation systems. Using the model, transient simulations for several realistic hydro projects are presented along with various transient control measures.
URI: http://hdl.handle.net/1807/19118
Appears in Collections:Doctoral
Department of Civil Engineering - Doctoral theses

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