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Discussion of Correcting Methods for Wake Fraction Scale Effect of River Twin-propeller Ship

Author: ZhangChen
Tutor: LiuZuYuanï¼›ZhangDaYou
School: Wuhan University of Technology
Course: Fluid Mechanics
Keywords: Sculls boat Performance prediction Wake fraction Scale effect correction
CLC: U664.33
Type: Master's thesis
Year: 2008
Downloads: 89
Quote: 0
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Abstract


The high-speed development of inland water transport , river transport ship design , construction put forward higher requirements . The research ship , explore the various factors affect the performance of the ship sailing the most effective and reliable way to ship model testing . The real ship performance prediction is an important part of the ship design and construction process , which about the the wake fraction scale effect correction for the real boat speed forecasting accuracy is critical . Determine the wake fraction scale effect , ITTC provides a lot of correction method , each ship design research units also done a lot to explore , and many effective methods . Although these methods are applied to a single paddle boats , but the calculated the single paddle boats formulas for mast ship inland sculls boat as well as a two-tailed ship many problems . The current research data shows sculls boat wake the score scale effect correction has not been able to get a good solution . More or empirical correction , or to extend the method recommended by the 15th International Towing Tank Conference sculls boat . Therefore , looking for a suitable inland sculls boat wake fraction scale effect correction method will be of great help to improve the accuracy of Sculls boat real ship performance prediction . In this paper, the current problems to be solved in the field , mainly in the following areas of work : 1. Analysis of the the wake fraction scale effect principle and sculls boat wake distribution , explore the sculls boat potential partners flow distribution pattern of the flow proportion to the total wake and the rotor disk at potential partners , qualitative description of a single pulp boat wake correction method commonly used in sculls boat 's limitations . Sculls boat using two - dimensional conversion method and three - dimensional conversion method for comparison discussed a three - dimensional conversion method to the conventional sculls boat shape factor K calculate the real ship full possessed effective power to take value. Collate and analyze performance prediction methods commonly used in domestic and foreign real boat and ship model converter combines several current applications , inland sculls boat wake fraction correction method , collection of ship models to experimental data calculated , the forecast results compare validation , the wake fraction scale effect correction method to determine a suitable inland sculls boat .

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CLC: > Transportation > Waterway transport > Marine Engineering > Ship machinery > Marine propulsion device > Propeller
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