TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE

Science journal

 
ISSN (print) 2542-2324 /(online) 2618-8244


Articles of The Transactions of KSRC








Artificial cavity as a tool for reduction ship resistance



Full text article ( in russian)

Year

 
2019

Issue

 
387

Volume

 
1

Pages

 
20-31

Caption

 
Artificial cavity as a tool for reduction ship resistance

Authors

 
Sverchkov A., Borusevich V.

Keywords

 
artificial cavity, mixed navigation (river-sea) vessel, bottom recess, model tests

DOI

 
10.24937/2542-2324-2019-1-387-20-31

Summary

 
Object and purpose of research.This paper presents the results of KSRC studies performed in the last decade on application of artificial cavities aboard carrier ships and fast boats to reduce their resistance
Subject matter and methodsThis paper gives model test data for ships of various types, obtained in deep-water, shallowwater, seakeeping and ice basins of Krylov State Research Centre, as well as suggests technical solutions on application of artificial cavity and corresponding automation equipment serving to generate air cavity in the bottom recess
Main results.This paper describes peculiarities of air cavity application aboard mixed navigation (river-sea) vessels with extremely high block coefficients, as well as aboard a sea-going carrier ship with increased block coefficient. It gives ice test data for the model of a BalticMax tanker. It has been shown how air cavities can be efficiently applied on fast displacement ships. The paper also discusses newly developed automated system for artificial cavity generation and briefly analyses the results of self-propulsion tests performed on models of carrier ships to understand the effect of air cavity upon propulsion performance of their propellers. The paper also reviews recent studies on air cavity application aboard gliding boats.
Conclusion.The study confirmed the hypothesis that artificial cavity applied on ships with very ample lines contributes to reduction of boundary layer separation area in their aft part and improves operational conditions of their propellers. The paper also suggests an efficient design of the device protecting the propeller against air penetrations from the cavity. Comprehensive experimental studies have confirmed the efficiency of artificial cavity application aboard ice-class ships, including its potential in ice resistance reduction. It has been found that for fast carrier ships the most efficient shape of the bottom recess for the air cavity generation will be trapezoid, which makes it different from previously studied designs of carrier ships.

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ISSN (print) 2542-2324 / ISSN (online) 2618-8244

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