HYDRODYNAMIC PERFORMANCE OF PARTIALLY SUBMERGED VENTILATED PROPELLER

The paper presents an unsteady numerical lifting surface method for performance prediction of partially submerged ventilated propellers enters and exits from water at high speed. When the propeller blade enters the free surface, the flow is expected to separate from both the leading and trailing edges of the blade, forming a cavity on the suction side that vents to the atmosphere. The problem is solve by vortex lattice method line sources and vortices are placed on the lower surface of the blade to simulate the cavity thickness and loading on the blade respectively. Line sources are also located on the cavity surface behind the trailing edge of the blade to represent the cavity thickness there. In addition an image of the singularity system describing the motion of the propeller blade has to be introduced to satisfy the free surface condition. The strength of all the singularities is determined by satisfying the non-penetration condition on the lower surface of the blade and the pressure condition on the back of the blade and behind the trailing edge of the blade. Then also the hydrodynamic performance of the partially submerged ventilated propeller can be calculated. The results predicted by the present method are compared with experimental data as well as other numerical results. The agreements are satisfactory.

• Supplemental Notes:
  • Shipbuilding of China, 109, n 2 1990, p 22 [10 p, 4 ref, 5 fig]
• Authors:
  • Wang, Guangmin
  • Jia, D
• Publication Date: 1990

Language

• Chinese

Subject/Index Terms

• TRT Terms: Aerodynamic lift; Forecasting; Performance; Propellers
• Uncontrolled Terms: Performance prediction
• Old TRIS Terms: Lifting surface theory
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00698767
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM