Marine Engines and Auxiliary Machinery
DOI: http://www.dx.doi.org/10.24866/2227-6858/2021-1-5

Kucherov V., Leont’ev L., Leont’ev A.

VLADIMIR KUCHEROV, Candidate of Engineering Sciences, First Class diesel mechanic, technical consultant of a shipping company Delta 
(Professor, Maritime State University named after Admiral G.I. Nevelskoy), nadezin@msun.ru
LEV LEONT’EV, Doctor of Engineering Sciences, Professor (Corresponding Author), ResercherID: U-9351-2017, ORCID: 0000-0002-8072-306X, ScopusID: 6603944093, Leontyev.l.b@yandex.ru
Politechnical Institute, Far Eastern Federal University
ANDREY LEONTIEV, Candidate of Engineering Sciences, Head of the Gas Supply and Energy Agency, gfi25leontev@mail.ru
Government of Primorsky Krai
Vladivostok, Russia

Influence of wear of high-pressure fuel pump plunger pairs 
on the performance of marine diesel engines

Abstract: An overview of the author's studies focused on increasing the durability of plunger pairs of high-pressure fuel pumps of marine diesel engines and the effect of their wear on engine performance is presented, made from 1990 to 2020. The factors affecting the resource indicators of the plunger pairs of high-pressure fuel pumps of marine low- and medium-speed engines have been clarified. Methods and possibilities for assessing wear indicators of fuel equipment are determined. A comparative analysis of the resource capabilities of plunger pairs, restored by various methods, and new pairs, manufactured by leading diesel-building companies, as well as an analysis of the effect of wear of plunger pairs of high-pressure fuel pumps on the performance of marine diesel engines is presented.It is shown that as the plunger pairs of high-pressure fuel pumps of marine medium- and low-speed diesel engines wear out, the cycle fuel supply decreases due to its leaks, while the temperature of the exhaust gases rises, which often leads to emergency situations. To increase the efficiency of operation and reliability of diesel engines, we have developed a promising hardening technology, which makes it possible to increase the wear resistance of the injection pump plunger pairs.It has been shown for the first time that high-pressure fuel pump plunger pairs, restored by applying wear-resistant chromium coatings, successfully compete with serial (uncoated plungers), and in the case of applying composite coatings (chromium + cermet), they provide significantly higher wear resistance. The dynamic hydraulic density of the steam and, accordingly, the cyclic fuel supply of plunger pairs with a wear-resistant plunger coating remains practically unchanged for a longer time (the period of stable dynamic hydraulic density is on average 2–3 times longer than for uncoated steam). The conditions of operation of precision parts of the fuel equipment of marine low and medium speed engines are described. The factors influencing the service life of the plunger pairs are given. Methods and possibilities for assessing the wear indicators of fuel equipment are determined.

Keywords: diesel, plunger pair, wear, failure, cyclic fuel supply, exhaust gas temperature, cover

Authors' contribution to the article: V.N. Kucherov – setting the problem, carrying out the indexing of diesel engines and processing the results, writing and editing part of the text; L.B. Leontiev – determination of the structure of the study, participation in the analysis, collection and processing of material, interpretation of the results of a review of technical literature, responsibility for the integrity of all parts of the article; A.L. Leontiev – collection and processing of material on wear, conducting bench tests, writing and editing part of the text, approval of the final version.
All authors – editing the text and approval of the final version of the article.
The authors declare no conflicts of interests.

See the reference in English at the end of the article