Open AccessComparison of propeller load curve of the main low-speed engines based on the results of modeling and trial tests
Author(s) -
Aleksey Sergeevich Sharatov,
AUTHOR_ID,
A.R. Garafutdinov,
AUTHOR_ID
Publication year - 2021
Publication title -
trudy krylovskogo gosudarstvennogo naučnogo centra
Language(s) - English
Resource type - Journals
eISSN - 2618-8244
pISSN - 2542-2324
DOI - 10.24937/2542-2324-2021-1-s-i-147-149
Subject(s) - propeller , hull , tonnage , cylinder , engine power , marine engineering , moment (physics) , diesel engine , rotational speed , test data , blade pitch , engineering , power (physics) , automotive engineering , mechanical engineering , turbine , oceanography , physics , software engineering , classical mechanics , quantum mechanics , geology
Under operating conditions, the main engine and the fixed pitch propeller are interdependent, and their parameters are interrelated. Main low-speed engines, as a rule, have significant cylinder power and are used on vessels characterized by significant coefficients of the hull volumetric completeness. With the stationarity of the operating factors, the vessel's speed is directly proportional to the propeller rotational speed. Thus we can talk about the self-similarity of the hull resistance characteristics and the propeller resistance moment. Analysis of the results of operational tests of heavy-tonnage vessels showed the deviation of the parabola coefficient of the propeller characteristic from the characteristic values. An increase in the error in assessing and predicting the heat load of an engine operating according to propeller characteristics can contribute to a decrease in the reliability of the main power plant. In the article, based on the operational test data, the indicators of interaction between the main engine, the vessel's hull and the propeller are analyzed in terms of the parameters of the equations of propeller and running characteristics. To verify the data, a mathematical model of the TRANSAS Engine Room System simulator was used. Based on the data obtained, it was agreed that adjustments of the mathematical description of the propeller characteristics should be made during the preparation of the vessel acceptance tests and the engines heat load control during operation.