scholarly journals Analysis of the possibilities to achieve adiabatization process of combustion surrounded by inactive gases in Rapid Compression Machine

2017 ◽  
Vol 168 (1) ◽  
pp. 27-31
Author(s):  
Wojciech CIEŚLIK ◽  
Ireneusz PIELECHA
Keyword(s):  
Combustion Process ◽  
Combustible Mixture ◽  
Spark Ignition Engine ◽  
Rapid Compression Machine ◽  
Working Medium ◽  
Main Injection ◽  
Rapid Compression ◽  
Combustible Gases ◽  
Combustion Processes ◽  
Combustible Mixtures

In this work non-combustible gases impact on combustion processes studies is performed. Research was performed in a optically accessible rapid compression machine (RCM) under spark ignition engine conditions. The distribution of the swirl charge in the relation to adopted for analysis sequence of gas delivery to the chamber was varied with regard to the main injection. Authors investigate the influence of these sequence on the combustion and the ignition delay of the main injection and the overall combustion characteristics. The aim of this work is the experimental recognition of possibilities of creating combustible mixtures of light hydrocarbon fuels surrounded by non-combustible gases affecting the function of the inhibitor. Specifying the ability of preparation and combustion of mixtures in such systems enables the scientific analysis of adiabatization of the combustion process of fuel-air mixtures in the operating chambers. Theoretical analysis of the issues indicates possibility of obtaining such a stratification of the charge, that the inactive exhaust gases creating the outer ring surround the combustible mixture inside in such a way as to reduce the amount of heat exchanged between the working medium and the walls of the cylinder.

scholarly journals Combustion Thermodynamics of Ethanol, n-Heptane, and n-Butanol in a Rapid Compression Machine with a Dual Direct Injection (DDI) Supply System

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2729
Author(s):  
Ireneusz Pielecha ◽  
Sławomir Wierzbicki ◽  
Maciej Sidorowicz ◽  
Dariusz Pietras
Keyword(s):  
Heat Release ◽  
Combustion Chamber ◽  
Internal Combustion Engines ◽  
Direct Injection ◽  
Combustion Process ◽  
Combustion Efficiency ◽  
Injection System ◽  
Rapid Compression Machine ◽  
Process Indicators ◽  
Rapid Compression

The development of internal combustion engines involves various new solutions, one of which is the use of dual-fuel systems. The diversity of technological solutions being developed determines the efficiency of such systems, as well as the possibility of reducing the emission of carbon dioxide and exhaust components into the atmosphere. An innovative double direct injection system was used as a method for forming a mixture in the combustion chamber. The tests were carried out with the use of gasoline, ethanol, n-heptane, and n-butanol during combustion in a model test engine—the rapid compression machine (RCM). The analyzed combustion process indicators included the cylinder pressure, pressure increase rate, heat release rate, and heat release value. Optical tests of the combustion process made it possible to analyze the flame development in the observed area of the combustion chamber. The conducted research and analyses resulted in the observation that it is possible to control the excess air ratio in the direct vicinity of the spark plug just before ignition. Such possibilities occur as a result of the properties of the injected fuels, which include different amounts of air required for their stoichiometric combustion. The studies of the combustion process have shown that the combustible mixtures consisting of gasoline with another fuel are characterized by greater combustion efficiency than the mixtures composed of only a single fuel type, and that the influence of the type of fuel used is significant for the combustion process and its indicator values.

Review of the Investigation of Fuel-Air Premixing and Combustion Process Using Rapid Compression Machine and Direct Visualization System

2013 ◽  
Vol 465-466 ◽  
pp. 265-269 ◽  
Author(s):  
Mohamad Jaat ◽  
Amir Khalid ◽  
Bukhari Manshoor ◽  
Siti Mariam Basharie ◽  
Him Ramsy
Keyword(s):  
High Speed ◽  
Combustion Engine ◽  
Early Stage ◽  
Combustion Process ◽  
Injection Pressure ◽  
Rapid Compression Machine ◽  
Mixture Formation ◽  
Visualization System ◽  
Optical Visualization ◽  
Rapid Compression

s :This paper reviews of some applications of optical visualization system to compute the fuel-air mixing process during early stage of mixture formation and late injection in Diesel Combustion Engine. This review has shown that the mixture formation is controlled by the characteristics of the injection systems, the nature of the air swirl and turbulence in thecylinder, and spray characteristics. Few experimental works have been investigated and found that the effects of injection pressure and swirl ratio have a great effect on the mixture formation then affects to the flame development and combustion characteristics.This paper presents the significance of spray and combustion study with optical techniques access rapid compression machine that have been reported by previous researchers. Experimental results are presentedin order to provide in depth knowledge as assistance to readers interested in this research area. Analysis of flame motion and flame intensity in the combustion chamber was performed using high speed direct photographs and image analysis technique. The application of these methods to the investigation of diesel sprays highlights mechanisms which provide a better understanding of spray and combustion characteristics.

scholarly journals Relations between ion signal and flame propagation in cylinder of a rapid compression machine

2019 ◽  
Vol 179 (4) ◽  
pp. 264-268
Author(s):  
Łukasz FIEDKIEWICZ ◽  
Ireneusz PIELECHA
Keyword(s):  
Combustion Engine ◽  
Combustion Process ◽  
Coefficient Of Determination ◽  
Rapid Compression Machine ◽  
Process Diagnosis ◽  
Gaseous Fuels ◽  
Ionization Signal ◽  
Flame Development ◽  
Combustion Phase ◽  
Rapid Compression

Internal combustion engine diagnostics using traditional methods of cylinder pressure signal processing limits the amount of information available about the combustion process. It is necessary to conduct research in order to obtain more precise information – increasing the combustion process diagnosis potential. One such suggestion is the use of an ionization signal and an attempt to link it to the flame development during combustion of gaseous fuels. The article attempts to identify such a relationship using a rapid compression machine due to optical access it provides to the combustion chamber. As a result of the research, the relationships between the ionization voltage (chemical and thermal) of the first combustion phase and the corresponding flame development rates were determined. A relatively high coefficient of determination value was obtained for both relations, which indicates the possibility of obtaining diagnostic information about the combustion process from the ionization signal.

scholarly journals The assessment of the of the usefulness of a Rapid Compression Machine in optical research on the injection and combustion processes of liquid fuels

2010 ◽  
Vol 143 (4) ◽  
pp. 3-14
Author(s):  
Krzysztof WISŁOCKI ◽  
Ireneusz PIELECHA ◽  
Jakub CZAJKA ◽  
Dmitrij MASLENNIKOV ◽  
Jacek KAŹMIEROWSKI
Keyword(s):  
Design Principles ◽  
Similar Type ◽  
Test Stand ◽  
Liquid Fuels ◽  
Rapid Compression Machine ◽  
Ic Engines ◽  
Rapid Compression ◽  
Combustion Processes

In the paper the possibilities of a Rapid Compression Machine in the investigation of the fundamental processes in IC engines have been presented. The test-stand design, principles of its control and basic operational features have been discussed and compared with the parameters of the test facilities of similar type currently in use worldwide. A short evaluation has been performed of its functionality and possibilities of application in the research on thermodynamics of injection and combustion processes. The evaluation pointed to the possibility of variation of the parameters and variables in the RCM. The main parameters and operational indexes of the Test-stand have been presented along with some examples of the achieved results from the investigations of engine internal processes

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