TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE

Science journal

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


Articles of The Transactions of KSRC








Optimization of thruster propeller geometry to mitigate periodical forces



Full text article ( in russian)

Year

 
2019

Issue

 
20192

Volume

 
2

Pages

 
67–72

Caption

 
Optimization of thruster propeller geometry to mitigate periodical forces

Authors

 
Bagrintsev V.V., Koval A.A., Marinich N.V.

Keywords

 
periodical forces, propeller, geometry optimization, thruster

DOI

 
10.24937/2542-2324-2019-2-S-I-67–72

Summary

 
This work is the first experience of merging well-known optimization methods for propeller geometry in order to mitigate periodical forces on propeller blades of thruster due to non-uniformities in thruster wake trail and duct wall effect, with preservation of the maximum efficiency. Optimization steps were as follows: selection of blade number, optimization of pitch distribution to mitigate cavitation risk for required shaft RPM at nominal output of power plant, determination of optimal skew distribution in order to mitigate periodical forces on thruster propeller blades and tunnel wall in required wake field; calculation f unsteady parameters for the propeller of tunnel thruster based on the linear theory of bearing surface taking into account induced speeds. The study yielded optimal geometry for thruster propeller, theoretical estimates of total periodical forces and experimental data for the initial and the optimized propeller. Test results for the two propellers (initial and optimized) were presented as performance curves, cavitation buckets and pressure fluctuations on thruster tunnel wall. Comparison of total periodical forces on propeller blades and tunnel wall, as well as comparison of the test data for the initial and the optimized propeller, confirmed the efficiency of suggested method.

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

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