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

• Published in: Transactions of FAMENA Vol. 42; no. 4; pp. 85 - 100
• Main Authors: Xia, Chenzhi, Cheng, Li, Luo, Can, Jiao, Weixuan, Zhang, Di
• Format: Journal Article Paper
• Language: English
• Published: Fakultet strojarstva i brodogradnje 11.03.2019
• Subjects: rotating stall; stall suppression; water jet propulsion system
• ISSN: 1333-1124; 1849-1391
• DOI: 10.21278/TOF.42408

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.