Model detonantnoga izgaranja u Ottovom motoru

Tomić, Rudolf (2015) Model detonantnoga izgaranja u Ottovom motoru. = Knock model for Spark-Ignition engines. Doctoral thesis , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Lulić, Zoran.

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2015-03-06-R_Tomic-Model_detonantnoga_izgaranja_u_Ottovom_motoru.pdf - Published Version Jezik dokumenta:Croatian

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Abstract (Croatian)

Detonantno izgaranje je nepoželjna pojava u Ottovom motoru koja nastaje uslijed naglog izgaranja još neizgorjele smjese ispred napredujuće fronte plamena, a visokofrekventne oscilacije tlaka koje pri tome nastaju mogu uništiti motor. Dosadašnjim istraživanjima navedene pojave utvrđeno je da do zapaljenja neizgorjele smjese najčešće dolazi uslijed samozapaljenja njenih vrućih dijelova. Razvojem modela za predviđanje pojave detonantnog izgaranja za 1-D/0-D proračunski model Ottovog motora u kojemu je modelirana temperaturna nehomogenost neizgorjele zone omogućiti će se simuliranje pojava vrućih mjesta u neizgorjeloj smjesi i točnija procjena intenziteta tlačnih oscilacija nastalih detonantnim izgaranjem. Osnova za razvoj i validaciju novog modela su postojeći 3D-CFD rezultati raspodjele temperature u neizgorjeloj smjesi i niz eksperimentalnih podataka o profilu tlaka u cilindru eksperimentalnog CFR motora (engl. Cooperative Fuels Research).

Abstract

Knock is an unwanted phenomenon in the spark-ignition engine generated by a rapid combustion of the end-gas in front of the propagating flame. The high frequency pressure oscillations generated by such rapid end-gas combustion can destroy the engine. Experimental studies of the knock phenomenon have found that the auto ignition of the end-gas occurs due to the presence of the hot spots. The development of a new knock model for 1D/0D spark-ignition engine model, which includes temperature stratification of the unburned zone, will enable the prediction of the hot spots in the end-gas. This will enable accurate prediction of the pressure oscillations caused by the knocking combustion. The basis for the development and validation of the new knock model are the existing 3D-CFD results of the temperature stratification of the unburned zone and a set of experimental pressure traces that were obtained in the CFR engine (Cooperative Fuels Research).

Item Type: Thesis (Doctoral thesis)
Uncontrolled Keywords: Ottov motor; simulacije; detonantno izgaranje
Keywords (Croatian): Spark Ignited Internal Combustion Engine; Simulation; Knock
Subjects: TECHNICAL SCIENCE
Divisions: 400 Department of IC Engines and Mechanical Handling Equipment > 410 Chair of IC Engines and Motor Vehicles
Date Deposited: 09 Apr 2015 11:44
Last Modified: 16 Oct 2015 12:44
URI: http://repozitorij.fsb.hr/id/eprint/3573

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