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Effect of nozzle shape on water-jet propeller propulsion performance |
KONG Dongmei, PAN Zhongyong*, ZONG Ping |
National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract To explore different water-jet propulsion performance of nozzle shape, take an axial hydraulic propeller as the research object, the computational fluid dynamics method for three different shapes(planar, convex and concave)nozzle jet propeller is used for unsteady numerical simulation of the contrast analysis of the different internal flow characteristics and hydraulic propeller thrust nozzle shape performance at the rated speed and high speed, so as to find the of nozzle shape of optimal thrust performance. The calculation results show that when the impeller speed is constantly changing, the thrust performance of the planar nozzle is always greater than that of the water spray thruster of the other two shape nozzles. Among them, at high speeds, the cavitation will affect the functional force of the impeller, thereby reducing the thrust performance of the water-jet thruster. At the rated speed, the thrust performance of the planar and concave nozzles is better, but the maximum axial velocity distribution of the planar nozzle is more; at the high speed, the planar nozzle is minimally affected by the cavitation and can continuously provide stable power. The applicability of different nozzle shapes to the water spray thruster at different speeds and the water jet propulsion efficiency are revealed, which provides a certain theoretical basis for the performance optimization and design of the water jet thruster.
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Received: 03 September 2020
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