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Transactions of FAMENA, Vol. 42 No. 4, 2018.

Professional paper

https://doi.org/10.21278/TOF.42408

Hydraulic Characteristics and Measurement of Rotating Stall Suppression in a Waterjet Propulsion System

Chenzhi Xia ; School of Hydraulic, Energy, and Power Engineering, Yangzhou University, Yangzhou, Jiangsu, P.R. China
Li Cheng ; School of Hydraulic, Energy, and Power Engineering, Yangzhou University, Yangzhou, Jiangsu, P.R. China
Can Luo ; School of Hydraulic, Energy, and Power Engineering, Yangzhou University, Yangzhou, Jiangsu, P.R. China
Weixuan Jiao ; School of Hydraulic, Energy, and Power Engineering, Yangzhou University, Yangzhou, Jiangsu, P.R. China
Di Zhang ; School of Hydraulic, Energy, and Power Engineering, Yangzhou University, Yangzhou, Jiangsu, P.R. China

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Abstract

Rotating stall as a kind of ship stall causes noise, vibration and unstable operation of a waterjet propulsion system and sometimes it can even cause fracture of blades and destruction of other flow passage components. To investigate the suppression of the rotating stall, a complete 3-D waterjet propulsion system model has been developed which contains an inlet passage, a propulsion pump and a nozzle. Hydraulic performance and flow characteristics are predicted by using a numerical simulation, which is in good agreement with the experimental results. For suppressing the rotating stall, separators are set in the outlet of the inlet passage. The analysis has shown the following: the rotating stall zone is found to be significant on the external characteristic curve in the low flow rate condition. Also, in the same condition a large scale flow separation region occurs in the propulsion pump, which is more intense at the rim of the impeller. The rotating stall of the propulsion pump system is controlled by setting separators at the outlet of the inlet passage. The recommended parameters of the separators are 0.5 D0 (length), 0.1 D0 (height), 0.4 D0 (location), 0.025 D0 (thickness), 4 (number of separators), where D0 presents the outlet diameter of the inlet passage.

Keywords

water jet propulsion system; rotating stall; stall suppression

Hrčak ID:

217506

URI

https://hrcak.srce.hr/217506

Publication date:

11.3.2019.

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