Design and Numerical Simulation of Turbine with Super Low Specific Speed Used in Cooling Tower
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Abstract:
The turbine with super low specific speed and a flow rate of 5000 t/h used in a cooling tower was investigated through structural design in order to develop a new type of small Francis turbine that can match fan directly and recover the surplus energy from cooling tower. On the basis of Reynolds time-averaged N-S equation, RNG k-ε turbulent model, and SIMPLC algorithm, the three-dimensional steady turbulent flow in the designed turbine model was simulated numerically using the commercial CFD software Fluent, and the flow field in the turbine and hydraulic loss of each component were analyzed. The results showed that the output power of turbine is 143.3 kW and the efficiency is 83.74% with a small head loss under the design conditions. When the redundant head was in the range of 12 to 14 m, the turbine had a good flow state and stable hydraulic performance with the efficiency of above 83%, which indicated that the turbine meets the design requirements.
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