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Calculating Runaway Pressure Surges in Small Hydro Units

by E. John List, California Inst of Technology, Pasadena, CA, USA,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

Determination of the runaway speed and concomitant pressure surges requires consideration of both the turbine rotodynamics and the waterhammer equations. In this paper a simplified method of analysis is demonstrated that enables a rapid calculation of the pressure surges created and the turbine runaway speed. A comparison with results of detailed computer-derived solutions shows the method to be very reliable, and that runaway-induced surges can be significant for some pump units used as turbines.

Subject Headings: Turbines | Water hammer | Computer models | Water supply systems | Pumps | Hydraulic pressure | Hydraulic models

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