Ispitivanje i analiza značajki rada dvo-gorivnog motora

Blažić, Mislav (2016) Ispitivanje i analiza značajki rada dvo-gorivnog motora. = Testing and performance analysis of dual fuel engine. Master's thesis (Bologna) , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Kozarac, Darko.

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Abstract (Croatian)

Porastom ekološke osviještenosti, prirodni plin postaje jedno od boljih alternativnih goriva, zbog svoje dostupnosti i niske cijene. Istraživanja su pokazala kako upotreba prirodnog plina kao transportnog goriva donosi mnoga poboljšanja u pogledu emisija. Upotreba prirodnog plina u motorima s kompresijskim paljenjem se istražuje kao novi koncept zbog veće efikasnosti takvih motora. Međutim, zbog visoke oktanske vrijednosti prirodnog plina, potreban je drugi izvor paljenja za što se može koristiti ubrizgavanje goriva s visokim cetanskim brojem. Taj tip izgaranja naziva se dvo-gorivno izgaranje. Cilj ovog istraživanja je postaviti i istražiti dvo-gorivni motor koji koristi kombinaciju dizelskog goriva i prirodnog plina. Postojeći dizelski motor je prenamijenjen kako bi mogao ostvariti dvo-gorivni način rada. Nakon uspješne prenamjene, utjecaji mase ubrizganog dizelskog goriva, trenutka ubrizgavanja, tlaka ubrizgavanja i brzine vrtnje na značajke rada motora su istraženi. Istraživanje je pokazalo kako se kombinacijom optimalnih parametara motora može postići smanjenje emisija i povećanje stabilnosti izgaranja na srednjem i visokom opterećenju. S druge strane, rad na niskom opterećenju je karakteriziran s niskom stabilnošću izgaranja uz visoke emisije neizgorjelih ugljikovodika (HC) i ugljikov monoksida (CO).

Abstract

With the increase of ecology standards, implementation of gaseous fuels is being studied. One of the most researched alternative fuels, due to its widespread availability and low cost is natural gas. It has been shown that the use of natural gas as a transportation fuel implies many improvements in terms of emissions. Due to the higher efficiency of compression ignited engines, implementation of natural gas in compression ignited engines is being studied. However, because of the high octane rating of natural gas, a small amount of high cetane fuel must be used to ignite the mixture. The engine then uses different fuels at the same time and is called a dual fuel engine. The objective of this thesis is to setup and study the diesel-methane dual fuel engine. An existing diesel engine has been converted to be able to run in the dual fuel operating mode. After the successful conversion, influences of the mass of injected diesel fuel, of the injection timing, of injection pressure and of engine speed on engine performance and emissions have been studied. It has been found that good combustion stability and lower emissions can be achieved at mid and high load with an optimum combination of engine parameters. On the other hand, operation under low load is characterized with unstable combustion coupled with low efficiency and high HC and CO emissions.

Item Type:	Thesis (Master's thesis (Bologna))
Uncontrolled Keywords:	dual-fuel engine; diesel; natural gas; injection pressure; injection timing
Keywords (Croatian):	dvo-gorivni motor; dizel; prirodni plin; trenutak ubrzigavanja; tlak ubrizgavanja
Subjects:	TECHNICAL SCIENCE > Mechanical Engineering
Divisions:	400 Department of IC Engines and Mechanical Handling Equipment > 410 Chair of IC Engines and Motor Vehicles
Date Deposited:	07 Jul 2016 09:40
Last Modified:	27 Mar 2020 16:21
URI:	http://repozitorij.fsb.hr/id/eprint/6204

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