THE CALCULATING MODEL OF AIR COMPRESSION PROCESS WITH LIQUID IN THE INTERNAL COMBUSTION ENGINE CYLINDER

ABSTRACT

Khrulev A.E., Dmitriev C.A. The calculating model of air compression process with liquid in the in­ternal combustion engine cylinder. Visnyk National Transport University. Series «Technical sciences». Sci­entific and Technical Collection. - Kyiv: National Transport University, 2020. - Issue 1 (46).

The paper discusses the features and performs a preliminary analysis of the symptoms and the causes of the connecting rod damage of an internal combustion engine caused by liquid entering the cylinder (hy­drolock).

Object of the study is the cylinder of an internal combustion engine when liquid enters it.

Purpose of the study is to research the mechanism of compression air with a liquid in the engine cyl­inder for identifying currently absent quantitative characteristics of the phenomenon of hydrolock, which causes deformation (buckling) and subsequent destruction of the connecting rod.

Method of the study is theoretical, includes the development of a methodology for calculating the variation of the air parameters during compression air with a liquid. Based on simplifying assumptions, a system of differential equations for the pressure and temperature of the air with a liquid in a cylinder is ob­tained from the equations of gas state and energy. The system is solved by numerical integration over the crankshaft rotation angle with initial conditions were obtained using the standard ICE cycle calculation soft­ware. As a result, computation of the cylinder pressure in compression process by the crankshaft rotation angle depending on the filling ration of the combustion chamber with liquid was performed.

The practical use of the methodology and the results obtained consists in their application in the problems of the engine damage simulation, including the calculations of the connecting rod buckling during hydrolock, as well as to clarify the symptoms and the causes of the damage.

By calculation using the developed methodology, it was found that with an increase in the amount of a liquid, the maximum pressure in the internal combustion engine cylinder rapidly increases during compres­sion, starting with the combustion chamber filling ratio of 80%. With a further increase in liquid filling, commensurate with the volume of the combustion chamber, pressure rise in the final phase of the compres­sion stroke is possible tens or even hundreds of times, which determines the damage to the connecting rod during hydrolock.

KEYWORDS: INTERNAL COMBUSTION ENGINE, ICE, CONNECTING ROD, CYLINDER, FAILURE, DAMAGE, HYDROLOCK, SIMULATION.

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AUTHOR

Khrulev Alexander Eduardovich, PhD in Technical Science, Senior researcher, forensic expert, In­ternational Motor Bureau (FOP Khrulev A.E.), e-mail: alo.engine@gmail.com, +38 096 1632183, Ukraine, 07853, Kiev region, Borodyansky district, village Nemishajeve, vul.Shkilna, 15, orcid.org/0000-0002-6841- 9225.

Dmitriev Sergey Alekseevich, Doctor of Technical Sciences, Professor, National Aviation Universi­ty, Director of the Educational and Scientific Aerospace Institute, e-mail: sad@nau.edu.ua, +380 44 406 7410, Ukraine, 03058, Kiev, Komarova ave., 1.

REVIEWER

Khrutba V.O., Doctor of Technical Sciences, Professor, Department of Ecology and Safety of Vital Functions, National Transport University, Kyiv, Ukraine

Skrypnyk V.S., the Candidate of Technical Sciences, docent, the Deputy Director for Educational Work in Nadvirna college of the National Transport University, Nadvirna, Ukraine

Article language: Ukrainian

Open Access: http://publications.ntu.edu.ua/visnyk/46/416.pdf

Print date: 15.04.2020

Online publication date: 27.10.2020

 

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