Detaljna analiza rada motora u dvogorivnom načinu rada

undergraduate thesis

• Title (english): Detailed analysis of engine operation in dual-fuel mode
• Author: Jerko Jerolimov
• Mentor: Darko Kozarac (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2019-03-01, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; General Mechanical Engineering (Construction)

Abstract

Radi sve veće težnje za smanjenjem štetnih emisija motora razvijaju se novi modeli izgaranja u motorima. Jedan od tih modela je i dvogorivni model motora u kojem se koriste prirodni plin i dizelsko gorivo. Konvencionalni dvogorivni način rada tog motora radi kao i Diesel motor na principu samoupaljivanja smjese zraka i goriva, ali za razliku od konvencionalnog, dvogorivni način rada tog motora omogućava korištenje plinovitog goriva tj. prirodnog plina koji se pali pomoću male količine dizelskog goriva koje se naknadno ubrizga u smjesu prirodnog plina i zraka u cilindru. Prednosti dvogorivnog načina rada su smanjeni udio štetnih emisija u ispuhu i, pri velikom opterećenju, stupanj djelovanja je približno jednak ili veći od konvencionalnog Diesel motora. Mana dvogorivnog načina rada je što pri malom opterećenju imaju puno niži stupanj djelovanja od konvencionalnih Diesel motora. Katedra za motore i vozila u zadnjih godinu dana u svom Laboratoriju ispituje dvogorivni način rada na modificiranom eksperimentalnom motoru. Na tom motoru provedena su razna mjerenja s brojnim parametrima rada. Od svih izmjerenih točaka odabrano je njih 16 za koje je napravljen simulacijski model. Simulacijske modele treba validirati, tj. potvrditi da je odstupanje od stvarno izmjerenih radnih točaka što manje kako bi se moglo sa što većom sigurnošću ići u daljnju analizu. Potom se analiziraju energetski gubitci koji nastaju u toku izgaranja i na osnovu njih donose se zaključci. Promatra se utjecaj energetskih gubitaka na stupanj djelovanja dvogorivnog motora.

Abstract (english)

The need for reduction of harmful emissions in engines has lead to research of new combustion models. One of those models is Dual-fuel which uses natural gas and diesel fuel. Dual-fuel works similarly as conventional Diesel engine which uses self-ignition to start combustion of fuel and air, but the main difference between Dual-fuel and conventional Diesel engine is that the Dual-fuel can use natural gas as a fuel. Natural gas is ignited by the use of small amount of diesel fuel which is injected into the cylinder to start the ignition and combustion of the natural gas and air mixture. Advantage of Dual-Fuel engine is reduction of harmful emissions and rise in efficiency at higher loads which parallels the efficiency of conventional Diesel engine. Main disadvantage is the obvious drop in efficiency at lower loads. The Chair for Engines and Motor Vehicles has been researching the Dual-fuel combustion in their laboratory on the modified experimental engine. Measurements were made on the engine using sensors for many different parameters which differently effect dual fuel combustion. From many measuring points, 16 of them were chosen for further analysis using simulations. The simulations of those points need to be validated which means that the deviation between the simulation and the real Dual-fuel, which was measured, is low so that there are no discrepancies, or they are minimised. Then further analysis can be conducted. The energy loss will be analysed and accoriding to them conclusions will be made. The impact of energy loss on Dual-fuel efficency is observed.

• Keywords: dvogorivni način rada; izgaranje; simulacije; stupanj djelovanja
• Keywords (english): Dual Fuel; combustion; simulation; efficiency
• Language: croatian
• URN:NBN: urn:nbn:hr:235:224546
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-05-23 00:06:10