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SR13 Mecânica dos Fluidos |
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Title:
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STUDY ON THE PRESSURE FLUCTUATION AND VIBRATION IN A DRAFT TUBE OF FRANCIS TURBINES INDUCED BY VORTEX- SIMPLIFIED METHOD.
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Summary :
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A GREAT PART OF THE HYDROELECTRIC POWER PLANTS USE FRANCIS TURBINES, IN WHICH THERE IS A GREAT AMOUNT OF VIBRATING PHENOMENA WHICH BRING ABOUT SERIOUS STRUCTURAL PROBLEMS TO THE MACHINES. THESE VIBRATIONS BECOME TROUBLESOME WHEN THE TURBINES OPERATE IN PART LOAD. THE PHENOMENON TERMED "CORE VORTEX" IS ENHANCED EXCITING THE SUCTION TUBE AT LOW FREQUENCY. SO, IN THIS WORK, A MATHEMATICAL MODEL TO FORESSE THE VORTEX FREQUENCY WHILE DESIGNING THE MACHINE, HAS BEEN DEVELOPED. THE THEORETICAL AND EXPERIMENTAL RESULTS ARE COMPARED AND DISCUSSED. |
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Author :
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Almeida, Márcio Tadeu
Simões, Alexandre Augusto
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Paper View :
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