Abstract
With the development of clean and renewable energy, especially tidal energy, people pay more and more attention to the performance optimization of tubular turbine. Tip clearance of a tubular turbine affects the flow field at the draft tube inlet, and then affects the overall performance of the turbine. In this paper, a full-passage model is established for a bulb tubular turbine. When the tip clearance is 2mm, the variation of pressure pulsation in the different sections of draft tube and the wall surface in different working conditions are monitored. And the effect of tip clearance on the pressure pulsation in the diffusion section is analyzed. The results show that the pressure pulsation is significantly enhanced near the inlet wall of draft tube under the effect of clearance leakage flow. The main frequency amplitude of pressure pulsation on the draft tube wall decreases along the flow direction, indicating that the effect of tip clearance leakage flow on the draft tube wall decreases gradually. The amplitude of pressure pulsation under deviation condition is much larger than the optimal condition, indicating that the effect of clearance leakage vortex on the wall of diffusion section is stronger under the deviation condition. The research results provide reference for the draft tube design of the tubular turbine and the safe and stable operation of the unit.
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