TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE

Science journal

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


Articles of The Transactions of KSRC








On quasi-crash-stop model tests of marine propellers



Full text article ( in russian)

Year

 
2019

Issue

 
389

Volume

 
3

Pages

 
37-48

Caption

 
On quasi-crash-stop model tests of marine propellers

Authors

 
Kotlovich V.

Keywords

 
crash stop, self-propulsion tests, crash-stop interaction

DOI

 
10.24937/2542-2324-2019-3-389-37-48

Summary

 
Object and purpose of research.This paper analyses the quasi-crash-stop model test data for propellers in open water and behind the hull of self-propelled ship models, as well as justifies a new method for presentation of the results and gives an approximate estimate for propeller-hull interaction in quasi-crash-stop conditions.
Subject matter and methodsThe study analyses existing methods for presentation of quasi-crash-stop propeller test data and justifies a new method that presents generalized thrust and torque coefficients as functions of βA,B angle at which JA,B = tan βA,B, where JA,B is advance ratio (A) or apparent advance (B) of the propeller. This method is extended to quasi-crash-stop tests of self-propelled ship models that give more complete information on crash-stop propeller parameters. The approximate analysis of hull-propeller interaction in various crash-stop scenarios given in this study has shown that actual thrust deduction coefficients and wake fractions of propellers are considerably different from those adopted at the design stage.
Main results.The paper justifies a new method of quasi-crash-stop test data for propellers in open water and behind the hull, and also shows that actual propeller-hull interaction coefficients are different from those adopted at propeller design stage. Therefore, for practical purposes, quasi-crash-stop tests are preferable to perform on self-propelled models rather than isolated propellers.
Conclusion.This paper could be helpful for quasi-crash-stop tests and design of propellers.

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

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