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Method for Determining Volumetric Efficiency and Its Experimental Validation

Abstract

Modern means of transport are basically powered by piston internal combustion engines. Increasingly rigorous demands are placed on IC engines in order to minimise the detrimental impact they have on the natural environment. That stimulates the development of research on piston internal combustion engines. The research involves experimental and theoretical investigations carried out using computer technologies. While being filled, the cylinder is considered to be an open thermodynamic system, in which non-stationary processes occur. To make calculations of thermodynamic parameters of the engine operating cycle, based on the comparison of cycles, it is necessary to know the mean constant value of cylinder pressure throughout this process. Because of the character of in-cylinder pressure pattern and difficulties in pressure experimental determination, in the present paper, a novel method for the determination of this quantity was presented. In the new approach, the iteration method was used. In the method developed for determining the volumetric efficiency, the following equations were employed: the law of conservation of the amount of substance, the first law of thermodynamics for open system, dependences for changes in the cylinder volume vs. the crankshaft rotation angle, and the state equation. The results of calculations performed with this method were validated by means of experimental investigations carried out for a selected engine at the engine test bench. A satisfactory congruence of computational and experimental results as regards determining the volumetric efficiency was obtained. The method for determining the volumetric efficiency presented in the paper can be used to investigate the processes taking place in the cylinder of an IC engine.

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Assessing diagnostic applicability of heat release characteristics determined based on ship engine indicator diagrams

T., Teodorczyk A.: Mathematical modelling of piston engine working cycle (in Polish). PWN, Warsaw 1990. Schweitzer P.: The Tangent Method of Analysis of Indicator Cards of Internal Combustion Engines. Biulletin No. 35, Pensylvania State University, September 1926. Wanszejd W. A.: Sudowyje dwigatieli wnutrienniewo sgoranija. Sudostrojenie, Leningrad 1977. Wiśniewski S.: Fundamentals of internal combustion engine thermodynamics (in Polish) . WNT, Warsaw 1962.

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The Use of a Mathematical Model of Marine Diesel Engine in a Computer Program

generator., Combustion Engines 3/2013 (154), 2013. Cwalina A, Zacharewicz M.(2015), Problems of mathematical modeling of the marine diesel engine working cycle for the diagnostic purposes. Solid State Phenomena, Vol. 236, 2015, pp. 212-219. Kniaziewicz T., Zacharewicz M. (2016), Research on energetic processes in a marine diesel engine driving a synchronous generator for diagnostic purposes PART 2 – Mathematical model of the processes, Journal of Polish CIMEEAC 2016 Vol. 11 No 1 pp. 199-209. Bogdanowicz A., Kniaziewicz T. Zacharewicz M. (2017), Physical

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