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INFLUENCE OF FUEL PROPERTIES ON ENERGY TRANSFORMATION IN FUEL INJECTION SYSTEM AT DIESEL ENGINES
Ivan Filipović
orcid.org/0000-0003-4687-1314
; Mašinski fakultet Sveučilišta u Sarajevu, Odsjek za motore i vozila
Boran Pikula
; Mašinski fakultet Sveučilišta u Sarajevu, Odsjek za motore i vozila
Dževad Bibić
; Mašinski fakultet Sveučilišta u Sarajevu, Odsjek za motore i vozila
Goran Kepnik
; Mašinski fakultet Sveučilišta u Sarajevu, Odsjek za motore i vozila
Sažetak
Use of the alternative fuels for propulsion of motor vehicles becomes widespread in all types of transport, from public transportation, taxi vehicles up to light duty vehicles intended for use in urban areas. The greatest application of alternative fuels is achieved in case of the minor reconstruction of engine construction (especially in case of diesel engine). However, a special attention should be dedicated to the characteristics of the fuel injection system in case of use of different fuels. The injection characteristics (fuel pressure and velocity at the exit from injector orifice) at diesel engines depend on characteristics of the fuel injection systems and fuel properties. The most important characteristics of the fuel injection system are the following: volumes in the fuel injection system, lengths between locations from fuel pushing to injection, mass of moving parts in the fuel injection system, cross section of fuel flows in the fuel injection system and characteristics of reflection of pressure and velocity waves.
In order to improve the injection characteristics, the greatest attention is paid to minimize the volumes of the fuel injection system, especially in the injector. On this way, rapid increasing in pressure gradient (dp/dt), smaller generating reflected pressure waves of fuel and better characteristics were obtained, especially at low load regimes (at small amounts of injected fuel). On the other hand, reducing the volumes in the injection system has the effect of reducing the dimensions (especially the flow channels). This directly affects on the transformation of potential energy (fuel pressure) into kinetic energy (velocity of fuel flow). Any change from potential to kinetic energy in the fuel injection system results an increasing of hydraulic losses and deterioration of the fuel injection characteristics. In the context of the above mentioned facts, the paper presents a detailed analysis of the transformation from potential to kinetic energy of the fuel in the case of the usage of different types of fuel (diesel fuel, biodiesel fuel). A special attention will be dedicated to the injector, where the biggest energy transformation and energy losses in the fuel injection system are occurred.
Ključne riječi
diesel fuel; biodiesel fuel; energy losses; diesel engine; fuel injection system
Hrčak ID:
126203
URI
Datum izdavanja:
7.7.2014.
Posjeta: 1.678 *