Propulsive Performance of High Rotation Speed Paddlewheels with Different Numbers of Paddles
[Objective]To address the unclear flow field characteristics of high rotation speed paddlewheel thrusters by studing the mechanical properties of such thrusters with varying numbers of paddles.[Method]In this paper,the researchers used computational fluid dynamics and the N-S equation to investigate the thrust,lift,torque,and flow field characteristics of a series of paddles at varying rotational speeds.Then the results with experimental data were compared and analyzed.[Result and Conclusion]The calculation method proposed in this study has a large error for the thrust of high rotation speed paddlewheel when v<5 m/s and v=9 m/s,but the error is generally below 9%near the peak v=7 m/s,and the overall trend is close to the experimental results;the paddlewheels have an optimal thrust curve at different towing speeds and different rotational speeds,and the optimal thrust curves are different for various numbers of paddles;there is a slight chattering of the paddlewheels at the towing speed v<5 m/s,mainly due to the design of the inlet angle of the paddle not fully matching the speed,and the high rotational speed(r>2 500 r/min)will not have a gain on the propulsive efficiency of the paddlewheel;the thrust efficiency of the paddlewheel can be improved by increasing the number of paddles under the state of high towing speed(v>8 m/s).
high rotation speed paddlewheel thrusternumber of paddlestowing speedmaximum thrust
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