Thermodynamical evaluation of usefulness of future hydrocarbon fuels for use in compression ignition engines

Abstract

The paper discusses the issues of the influence of the fuel spray formation on the generation of self-ignition spots and the development of pre-flame processes in the cylinder of a model diesel engine. The investigations were carried out for a standard diesel fuel and two other types of fuel that were mixtures of ethanol, butanol, and diethylether in a variety of proportions. By applying optical methods of analysis, the authors determined the geometrical indexes of the injected fuel spray as well as fuel mass distribution in the longitudinal and transverse cross section of the fuel spray during the injection process. The location and number of the self-ignition spots in the combustion chamber were evaluated on the basis of a comparison under various conditions: in presence of the charge swirl and at the lack of it. Research conducted for the single-cylinder engine confirmed the possibility of the use of diesel-like fuels for compression ignition engines.

Evaluation of the injectors operational wear process based on optical fuel spray analysis

“…A fixed volume chamber with a set backpressure value was used to determine the fuel stream geometry, using a diesel fuel injection (the exact description of the chamber can be found in [14]). Fuel injection at 35 MPa (corresponding to idle and low load conditions) and injection time of 0.3 ms were used in the research.…”

The Influence of Diesel Oil Improvers on Indices of Atomisation and Combustion in High-Efficiency Engines

“…A constant volume chamber (CVC) was used as the space being registered [9,13,14], which allowed the setting of a backpressure, thereby simulating conditions existing in the combustion chamber during injection in a diesel engine (2 MPa backpressure). Optical access to the chamber combined with halogen lighting enabled the registration of drops.…”

“…The second phase of the experiment consisted in using a Rapid Compression Machine (RCM) [13] to carry out combustion of both fuels. The machine allows to carry out one combustion cycle simulating the combustion cycle in a combustion engine.…”

The experimental determination of the relationship between the energising time of the common rail injector and the set fuel quantity and rail pressure

“…in general, the overall volume-time characteristics of the fuel injection process significantly affect the heat release and, consequently, the engine performance, as well as the contents of harmful substances in the exhaust gas, including solid particles (mainly soot), and the noise generated by the engine in operation [4][5][6][7].…”