Development of Numerical Model to Compute Water Hammer Transients in Pipe Flow
Water hammer is a hydraulic transient problem which is commonly encountered in the penstocks of hydropower plants. The numerical model was developed to estimate the transient behavior of pressure waves in pipe systems. The computational algorithm was proposed to model the water hammer phenomenon in a pipe system with pump shutdown at midstream and sudden valve closure at downstream. To predict the pressure head and flow velocity as a function of time as a result of rapidly closing a valve and pump shutdown, two boundary conditions at the ends considering pump operation and valve control can be implemented as specified equations of the pressure head and flow velocity based on the characteristics method. It was shown that the effects of transient flow make it determine the needs for protection devices, such as surge tanks, surge relief valves, or air valves, at various points in the system against overpressure and low pressure. It produced reasonably good performance with the results of the proposed transient model for pipeline systems. The proposed numerical model can be used as an efficient tool for the safety assessment of hydropower plants due to water hammer.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1317388Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 626
 J. Carlsson, “Water Hammer Phenomenon Analysis using the Method of Characteristics and Direct Measurements using a ‘stripped’ Electromagnetic Flow Meter,” Division of Nuclear Reactor Technology, Department of Physics Royal Institute of Technology, SE-106 91 Stockholm, Sweden, 2016.
 M. H. Chaudhry, “Applied Hydraulic Transients,” New York: Van Nostrand Reinhold Company, 1987.
 E. B. Wylie and V. L.Streeter, “Fluid Transients in System,” Prentice-Hall, Inc. 1993.
 Z. Zarzycki, “Simulation of Transient Flows in a Hydraulic System with a Long Liquid Line,” Journal of Theoretical and Applied Mechanics, Warsaw 2007, vol. 45, no. 4, pp.853-871.
 Bruce E. Larock, Roland W. Jeppson and Gary Z. Watters, “Hydraulics of Pipeline Systems,” CRC Press LLC. 2000.