Article 10218

Title of the article

IMPACT OF THERMOPHYSICAL PROPERTIES OF PISTON
ON THE OPERATIONAL CHARACTERISTICS OF INTERNAL COMBUSTION ENGINES 

Authors

Kazantsev Igor' Alekseevich, Candidate of engineering sciences, professor, sub-department of welding, foundry and materials science, Penza State University (40 Krasnaya street, Penza, Russia), kazancev678@mail.ru
Bychkov Valeriy Igorevich, Master's degree student, Penza State University (40 Krasnaya street, Penza, Russia), pnz.el@mail.ru
Kazantsev Aleksey Igorevich, Engineer-mechanic of 1st category, Scientific production enterprise “Rubin” (2 Baydukova street, Penza, Russia), ale.kaza@yandex.ru 

Index UDK

539.232 

DOI

10.21685/2072-3059-2018-2-10 

Abstract

Background. The object of the study are pistons of internal combustion engines.
The subject of the research is the process of obtaining protective coatings on pistons by microarray oxidation. The aim of the work is to establish the influence of thermal properties of pistons on the performance of internal combustion engines.
Materials and methods. Aluminum-based alloy (AC12) and electrolyte based on sodium liquid glass, sodium hydroxide and sodium phosphate were used in the research and development of the technology of micro-arc oxidation of pistons. Determination of microhardness of heat-shielding layers was carried out according to the standard technique on cross-section microshoots according to GOST 9450-76. The porosity of the heat-shielding layers was evaluated according to GOST 9.302-88. Temperature conductivity and thermal conductivity were measured by laser flash method LFA 427. Bench tests of the petrol engine UMZ-417 with standard pistons (without thermal protection oxide layers) and pistons with thermal protection oxide layers on the bottoms of pistons were carried out according to GOST 14846-81 on the stand KI-5543 GOSNITI.
Results. The influence of thermal properties of pistons on the performance of internal combustion engines is established. It is shown that reducing the thermal conductivity of the piston bottom allows to improve the technical characteristics of internal combustion engines.
Summary. By results of bench tests it is established that at engines with heatproof oxide layers on bottoms of pistons the maximum torque and effective power increase, the hour and specific effective fuel consumption decreases, the content in the fulfilled gases of carbon monoxide and hydrocarbons decreases.  

Key words

piston, oxide, electrolyte, thermal conductivity

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References

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Дата создания: 11.12.2018 13:20
Дата обновления: 17.12.2018 09:02