Utjecaj ubrizgavanja metanola na značajke rada Ottovog motora

undergraduate thesis

• Title (english): Influence of methanol injection on spark ignition engine performance
• Author: Lorena Krajc
• Mentor: Momir Sjerić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-03-01, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; General Mechanical Engineering (Construction)

Abstract

U svrhu smanjenja štetne emisije u ispuhu motora s unutarnjim izgaranjem, nameće se potreba za odabirom alternativnog goriva. Između ostalih zamjenskih goriva za goriva na bazi nafte, metanol se smatra jednim od najpovoljnijih za motore s unutarnjim izgaranjem. U ovom završnom radu analizirane su promjene značajki rada konvencionalnog Ottovog motora za slučaj kada bi se benzinsko gorivo promijenilo na metanol. Prednost metanola naspram benzina je viši oktanski broj i veća specifična toplina isparavanja što ga čini prikladnim za primjenu kod motora s visokim kompresijskim omjerom i velikom izlaznom snagom. Korištenjem programskog paketa AVL BoostTM napravljena je simulacija pojednostavljenog Ottovog motora podešena da daje vrijednosti momenta deklarirane od proizvođača. Promjenom na metanol napravljene su dvije simulacijske konfiguracije. Prva konfiguracija napravljena je zamjenom benzina na metanol bez promjene radnih parametara, dok su u drugoj konfiguraciji radni parametri motora promijenjeni kako bi se postigla najveća učinkovitost. Značajke rada dobivene promjenom na metanol prikazane su dijagramima. Na temelju provedenih simulacijskih kalibracija napravljeni su usporedni topografski dijagrami za značajke rada benzinskog motora i motora s promjenom goriva na metanol za kojega su postignute najbolje moguće performanse motora.

Abstract (english)

In order to reduce harmful emissions in the exhaust of internal combustion engines, there is a need to choose an alternative fuel. Among other substitute fuels for fuels based on petroleum, methanol is considered one of the most favorable for internal combustion engines. This bachelor thesis analyzes the changes in the operation characteristics of the conventional Otto engine for the case when gasoline fuel would be changed to methanol. The adventage of methanol over gasoline is a higher octane number and higher specific heat of vaporization, as compared to gasoline, which makes it suitable for applications in engines with a high compression ratio and large output power. By using the AVL BoostTM program package, a simulation of a simplified Otto engine was made, adjusted to give the torque values declared by the manufacturer. While converting fuel to methanol, two simulation configurations were made. The first configuration was made by replacing gasoline with methanol without changing the operating parameters, while in the second configuration, the operating parameters of the engine have been changed to achieve the highest efficiency. The performance characteristics obtained by switching to methanol are shown in diagrams. Based on the completed simulation calibrations, comparative topographic diagrams were made for the performance characteristics of the gasoline engine and the engine with a change of fuel to methanol, for which the best possible engine performance was achieved.

• Keywords: AVL BoostTM; Ottov motor; metanol; značajke rada
• Keywords (english): AVL BoostTM; Otto engine; methanol; performance characteristics
• Language: croatian
• URN:NBN: urn:nbn:hr:235:482265
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering; Course: Design; 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: 2023-02-27 12:36:03