Abstract
This paper aims to study the nonlinear hydraulic coupling characteristics and energy conversion mechanism of pipeline - surge tank system of hydropower station with super long headrace tunnel. Firstly, the model of hydropower station considering nonlinear hydraulic coupling of pipeline - surge tank system is established. Then, the dynamic behaviors are evaluated, and the effects of nonlinear head losses of pipeline - surge tank system on dynamic behaviors are analyzed. Finally, the energy conversion mechanism of pipeline - surge tank system is revealed. The results indicate that both the nonlinear head loss term of super long headrace tunnel and linear head loss term of penstock are unfavorable for stability. The nonlinear throttling orifice head loss of surge tank has a remarkable impact on dynamic response processes. The nonlinear head losses of pipeline - surge tank system mainly affect the kinetic energy of flow in pipeline. A part of the kinetic energy of flow in pipeline interconverts with the kinetic energy of flow in surge tank.
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