Heat generation and heat consumption in engine of rapid internal combustion
Date
2018-01-29
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Lviv Politechnic Publishing House
Abstract
The research of heat generation and heat consumption in a conventional or ideal
engine provides useful information about the regularities, character of the process and effectiveness
of fuel combustion in any real engine that cannot be subject to experiments. This information is
advantageous both in case of heat transformation effectiveness analysis and the development of
means to improve already employed engine. The procedure (algorithm) of thermal processes
modeling that take place in the internal combustion engines should be developed in a way that
enables, according to measured pressure of working gases, to adequately reconstruct the course of
heat generation, and vice versa, relying on a set course of heat generation, to veritably identify the
change of gases pressure in the cylinder. Research aim – based on the principle of analogy and
harmonious combination of induction and deduction to evaluate the possibility to represent in a
formal way and theoretically generalize experimentally identified information about the regularities
of heat generation and heat consumption processes development in Otto-cycle engines (engines of
rapid internal combustion). As a rule in case of analytical identification of heat generation – heat
consumption processes the index a of combustion capacity is defined in advance. The acquired
information, however, demonstrates that there are more reasons to consider the value of the
parameter m to be set in advance, rather than of the parameter a. The relation between values of heat
emission maximal intensiveness z& * and the time of its achievement t * in an empirical sense is
seemingly parabolic. Theoretically, as it has been found out, it can be evidently treated as “fuzzy”
hyperbolic. The fact that the engine’s idle run does not conform to the “hyperbolic” tendency
manifests its considerable imperfection and does not contend against the theoretically substantiated
regularity. Given, for example, that z& *t* »1, it is possible to acknowledge that m »1.93. While
given m » 2 , we will have to acknowledge that z&*t* »1.03 . Thus, if we assign in advance that a = -6.908 we considerably limit the flexibility and preciseness of the identification algorism.
Description
Keywords
internal combustion engine, operating cycle, heat generation, heat consumption, combustion process, Wiebe function, heat generation programs
Citation
Hashchuk P. Heat generation and heat consumption in engine of rapid internal combustion / Petro Hashchuk, Serhij Nikipchuk // Ukrainian Journal of Mechanical Engineering and Materials Science. — Lviv : Lviv Politechnic Publishing House, 2018. — Vol 4. — No 1. — P. 160–174.