TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE

Science journal

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


Articles of The Transactions of KSRC








Fast vessels with pumpjets



Full text article ( in russian)

Year

 
2015

Issue

 
374

Volume

 
4

Pages

 
5–10

Caption

 
Fast vessels with pumpjets

Authors

 
G. Kanevsky, S. Kaprantsev, A. Sokolov

Keywords

 
waterjets, fast vessel, hydrodynamic parameters

Summary

 
The paper describes the set of model tests performed on a fast vessel with displacement of ~3700 m3 so as to assess how the application of pumpjets with short water duct instead of propellers affects hydrodynamics. During replacement of propulsors, tilted shaft lines with their brackets were removed. To install waterjets, water ducts were made in the hull. Thus, the ship did not have a number of appendages, so with waterjets she showed ~5 % reduction in total towing drag. Open-water testing of waterjet models showed rather high efficiency, maximum 70 % at advance ratio of 1.5. For comparison: maximum efficiency of propellers was 66 % at the advance ratio of 1. Thus, in open-water, jet propulsors have ~6 % higher efficiency than propellers. Self-propulsion tests have shown that at full-speed (30 knots), the fast vessel with waterjets showed a drastic change in propulsor-hull interaction parameters, as compared to the data for propellers. In particular, wake fraction increased from –0.005 to 0.043. Thrust deduction coeffi-cient decreased from 0.09 to 0.034. Relative rotative factor is equal to 1 in both cases. Hull efficiency in these conditions grew from 0.905 to 1.008, i.e. by 11.4 %.

Rubrics

 
Naval architecture

Back to the list



 





 
Login:
Password:
Register
Forgot your password?


Last issues

All rights reserved © Krylov state research centre, 2020


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

Address: Moskovskoye shosse, 44, Saint-Petersburg, 196158

Phone: +7(812) 415-49-80