In order to save energy, a new type of Francis turbine with highspecific speed was developed to replace fan motor in the cooling tower equipped with a suitable reducer by numerical simulation and model test. According to the features of Francis turbine operation environment, metal trapezoidal volute and uniseriate ring guide vanes were applied in the structural design. The forms of vanes, blade stagger angle and the rotational speed were analyzed by numerical simulation. The negative curvature guide leaf form, the optimum rotational speed and blade angle are selected as the optimal plan. The model test results show that the highspecific speed hydraulic turbine developed meets the dimension requirement and has high efficiency and stable performance, which can be popularized and applied in the capable local places.
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