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Effect of Air Admission on Pressure Pulsation in a Francis Turbine
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In this study pressure and shaft torque pulsation were measured with variation of head and flow during the modeltest for a 15 MW Francis Turbine. Pressure pulsations were measured at the inlet of the spiral casing and 4 points in the coneof the diffuser and shaft torque pulsation at the upper position of the turbine. The maximum amplitude of pressure pulsationappeared 2.03% of the maximum rated head with the frequency of 25% of the rated revolution and at the guide vane openingof 10°. Shaft torque pulsation appeared 0.01% of the rated shaft torque, fairly low value. Air was admitted through the coneand pressure pulsation gradually decreased with increase of air flow and kept nearly constant after 5% of the rated flow. A newFrancis turbine of which specific speed is 115 m-kW had been designed to rehabilitate the old one and the model test wasperformed at EPFL. The commercial code, STAR-CCM+ was used for numerical simulation of flow.
Abstract
In this study pressure and shaft torque pulsation were measured with variation of head and flow during the modeltest for a 15 MW Francis Turbine. Pressure pulsations were measured at the inlet of the spiral casing and 4 points in the coneof the diffuser and shaft torque pulsation at the upper position of the turbine. The maximum amplitude of pressure pulsationappeared 2.03% of the maximum rated head with the frequency of 25% of the rated revolution and at the guide vane openingof 10°. Shaft torque pulsation appeared 0.01% of the rated shaft torque, fairly low value. Air was admitted through the coneand pressure pulsation gradually decreased with increase of air flow and kept nearly constant after 5% of the rated flow. A newFrancis turbine of which specific speed is 115 m-kW had been designed to rehabilitate the old one and the model test wasperformed at EPFL. The commercial code, STAR-CCM+ was used for numerical simulation of flow.
참고문헌 (10)
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