1989 Fiscal Year Final Research Report Summary
Study on Stern Flow and Propeller Performances of a Ship
| Project/Area Number |
63460145
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
船舶抵抗・運動性能・計画
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| Research Institution | YOKOHAMA NATIONAL UNIVERSITY |
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Principal Investigator |
IKEHATA Mitsuhisa Yokohama National University, Engineering, Professor, 工学部, 教授 (10114969)
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| Co-Investigator(Kenkyū-buntansha) |
TAKUSAGAWA Zensuke Yokohama National University, Engineering, Assistant, 工学部, 助手 (60017902)
SUZUKI Kazuo Yokohama National University, Engineering, Associate Professor, 工学部, 助教授 (80111699)
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| Project Period (FY) |
1988 – 1989
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| Keywords | STERN FLOW / BOUNDARY LAYER / WAKE / WAVE MAKING / INTERACTION / PROPELLER / EFFECT OF RUDDER / STATOR |
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| Research Abstract |
1) Variation of inflow velocity and fluctuation of thrust and torque of a propeller due to the effect of rudder
The theoretical calculation has been carried out on variation of inflow velocity induced by the rudder and on fluctuation of thrust and torque of a blade of a propeller due to the effect of the rudder by the method employing the vortex lattice model to the propeller and the rudder. The amounts of such fluctuations are not small, so that they should be taken into consideration in analysis of unsteady characteristics of a propeller.
2) Theoretical calculation of propulsive performances of stator-propeller in uniform flow by vortex lattice method
By fitting stator vanes behind a screw propeller, energy loss of rotational flow in the slip stream of the propeller can be reduced and hence the propeller efficiency can be improved. We call it stator-propeller. The improvement of the stator-propeller has been proved by model experiments. In the present research a theoretical method to calculate the propulsive performances of stator-propeller has been developed employing vortex lattice method.
3) Interaction problem between boundary layer and waves around a ship
The interaction problem between boundary layer and waves around a ship has been solved by a integral method of three-dimensional boundary layer theory in combination with Rankine sources method for exterior potential flow.
4) Mutual interaction between propeller and rudder
The effect of propeller on rudder and the difference of flow around the rudder with or without the propeller have been investigated experimentally using LDV and theoretically by the conformal mapping.
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