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| Hydrodynamic characteristics of shaft-less waterjet pump |
| Liu Ruihua1, Cao Puyu2, Wang Yang2, Ning Chao2 |
| 1.Jiangsu Electric Power Construction No.3 Engineering Company, China Energy Engineering Group Co. Ltd., Zhenjiang, Jiangsu 212013, China; 2.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract A design concept of shaft-less waterjet propulsion pump is put forward to improve the hydrodynamic performance of existing SDPM-450 waterjet pump. In such a design, a gear transmission system replaces the conventional belt-shaft transmission to drive the pump impeller. Since the upstream shaft has been removed, its disturbance on the flow field in the inlet conduct is avoided. The hydrodynamic performances of the shaft-less waterjet pump and the conventional one are predicted by using CFD code under ship high speed conditions. The hydrodynamic characteristics are clarified based on theoretical analysis, internal flow field and propulsion performance. A theoretical analysis shows that the flow rate discharged by the pump and the capability of doing work of the pump are improved. As a result, the shaft-less pump is subject to 20% more thrust and 15% more efficiency compared with the conventional pump. Based on flow field analysis, the shaft-less pump presents a shrunk wake and a reduced inflow loss. The propulsion performance analysis reveals that the shaft-less pump can work more efficiently at a high speed, causing a 3-5knot increment in the sip speed in average.
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Received: 11 February 2015
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