Abstract
An application of contra-rotating rotors, in which a rear rotor is in tandem with a front one and these rotors rotate in the opposite direction each other, has been proposed against a demand for developing higher specific speed axial flow pump. However, our prototype rear rotors designed with the conventional method under the same rotational speed as the front rotor have revealed several problems; the head is not satisfied even at the design flow rate, cavitation inception is observed on the rear rotor despite of the head increase of front rotor and so on. In the present study, to solve these problems, three new rear rotors are designed based on the reduced speed design with taking account of information from the previous studies. One of them, which considers the outlet flow distribution of front rotor as well as the control of secondary flow with the different maximum camber position from hub to tip and the small incidence angle for better cavitation performance, is found to show the best performance in the numerical simulations. An experimental validation is carried out for this rotor, showing that the rotor satisfies the design specifications with higher total efficiency than the existing rotor at the design flow rate. Discussions on off-design performances are also made based on the measured performance data.
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