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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2018  >  18(4): 120-131
PENG Yun-long, WANG Yong-sheng, YI Wen-bin, LIU Cheng-jiang. Effect of blade tip clearance on waterjet propulsion hydrodynamic performance[J]. Journal of Traffic and Transportation Engineering, 2018, 18(4): 120-131. doi: 10.19818/j.cnki.1671-1637.2018.04.013
Citation: PENG Yun-long, WANG Yong-sheng, YI Wen-bin, LIU Cheng-jiang. Effect of blade tip clearance on waterjet propulsion hydrodynamic performance[J]. Journal of Traffic and Transportation Engineering, 2018, 18(4): 120-131. doi: 10.19818/j.cnki.1671-1637.2018.04.013
shu

Effect of blade tip clearance on waterjet propulsion hydrodynamic performance

doi: 10.19818/j.cnki.1671-1637.2018.04.013

  • School of Power Engineering, Naval University of Engineering, Wuhan 430033, Hubei, China

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    Abstract
  • Mixed-flow and axial-flow waterjet pumps with the same design parameters were selected as objects respectively. The hydrodynamic performances of mixed-flow and axial-flow waterjet pumps with four blade tip clearances were numerically simulated based on the shear stress transport turbulence model, implicit multi grid coupling algorithm and all structured grids. The effect of blade tip clearance on the hydrodynamic performance of waterjet propulsion was analyzed, and the relationship between the influence degrees of blade tip clearance and waterjet type was researched. Analysis result indicates that the head and efficiency of two types of pumps both decrease with the increase of blade tip clearance. The power consumption of mixed-flow waterjet pump first increases and then decreases with the increase of blade tip clearance. When the blade tip clearance is 1.3 mm, the power consumption is maximum. But the consumption of axial-flow waterjet pump monotonously decreases. The pump efficiency change due to the change of blade tip clearance of mixed-flow waterjet pump is not affected by mass flow, while that of axial-flow pump increases with the increase of mass flow. When the larger blade tip clearance isused as the reference, the same variation of blade tip clearance makes the efficiency of mixed-flow pump change larger, while the efficiency of axial-flow pump is opposite. The main reason resulting in the hydrodynamic difference between mixed-flow and axial-flow waterjet pumps is the different tip vortex effects on tip clearance leakage flow caused by the structure geometry. When the blade tip clearance increases from 0.7 mm to 1.6 mm, the thrust efficiencies of two types of waterjet propulsions change within 1%. When the blade tip clearance increases, the power consumptions of two types of waterjets show the same trend with waterjet pumps. The total thrust and power of axial-flow waterjet change larger than the values of mixed-flow waterjet, which means the mixed-flow waterjet is more adaptable to the change of blade tip clearance than axial-flow waterjet.

     

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