Određivanje plamišta i gorišta motornih ulja razrijeđenih gorivom

undergraduate thesis

• Title (english): Determination of flash point and fire point of the oils diluted with fuel
• Author: Dario Rezo
• Mentor: Davor Ljubas (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2017-03-02, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Zadnja stvar na kojoj bi svaki vozač automobila trebao štedjeti ukoliko želi maksimalno produžiti vijek njegovog motora je motorno ulje. Iznimno važna komponenta za siguran i neometan rad bilo kojeg motora sa unutarnjim izgaranjem je kvalitetno podmazivanje motornih dijelova uljem. Motorna ulja predstavljaju grupu maziva čiji značaj stalno raste s razvojem motorne industrije i čine najveći dio potrošnje maziva. U početku su se za podmazivanje koristila mineralna ulja te biljno ulje (ricinusovo ulje) koje se koristilo za trkaće motore. Zbog sve većeg napretka u pogledu razvoja motora, sve težih zahtjeva na uvjete rada te što duljih intervala izmjene ulja, za podmazivanje su se počela koristiti, a i danas su najviše u uporabi, sintetička te u manjim mjerama i polu-sintetička motorna ulja. U motoru se zbivaju velike temperaturne promjene. Motor mora raditi i pri temperaturama ispod 0 °C, a s druge strane najpovoljnija temperatura u karteru za ulje je iznad 80 °C da bi mogla ispariti vlaga koja se skuplja kao ostatak izgaranja vodika iz goriva. Temperature na ležajima koljenastog vratila i klipnjača su za oko 10 °C iznad temperatura u karteru, dok se klipni prsteni kod većih opterećenja motora ugriju i do 230 °C. Zbog niza razloga gorivo u Ottovim i Dieselovim motorima ne izgara u potpunosti te se jedan dio neizgorenog i/ili djelomično izgorenog goriva probije i u kućište motora gdje se miješa i otapa u motornom ulju. Zbog takvih pojava i gore navedenih temperatura, provjera temperature plamišta te temperature gorišta motornog ulja je od iznimne važnosti.

Abstract (english)

The last thing on which every car driver should save up if he wants maximum extend the life of its engine is motor oil. Very important component for safe and smooth operation of any internal combustion engine is a high-quality lubricating of engine parts with oil. Motor oils represent a group of lubricants whose importance is constantly growing with development of motor industry and they constitute the largest part of lubricant consumption. In the beginning for the lubrication were used mineral oils and vegetable oils (castor oil) which are used for racing engines. Due to increasing advancement in regarding the development of the engine, heavier demands on working conditions and longer oil change intervals, started the use of synthetic, and in smaller measures semisynthetic oils for the lubrication. Synthetic and semi-synthetic oils are still in use. Inside the engine large temperature changesoccur. The engine must operate sometimes at a temperature under 0 °C, and on the other side the most favorable temperature in crankcase of oil should be above 80 °C to enable the evaporation of moisture that accumulates as the consequence of the fuel-hydrogen combustion. Temperatures on the crankshaft bearings and connecting rod are about 10 °C above the temperature in crankcase, while the piston rings at higher engine load warm up to 230 °C. For many reasons fuel in Otto and Diesel engines does not burn completely and one part of unburned or partially burned fuel break through into engine casing where it mixes and dissolves in the motor oil. Because of these phenomena and the abovementioned temperature, checking the temperature of the flash point and temperature of fire point of motor oil is extremely important.

• Keywords: Motorno ulje; Temperatura ulja; Plamište; Gorište; Motorni benzin; Dizelsko gorivo
• Keywords (english): Motor oil; Oil temperature; Flash point; Fire point; Motor gasoline; Diesel fuel
• Language: croatian
• URN:NBN: urn:nbn:hr:235:289824
• 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: 2019-05-22 18:52:02