Analysis of gas engine characteristics for generator drive

U diplomskom radu opisan je nulto-dimenzionalni model plinskog motora Waukesha H24GL s prednabijanjem. Ukratko su opisani i simulacijski modeli motora, te prednosti i nedostaci pojedinih tipova modela. Opisani su matematički modeli svakog od glavnih dijelova motora koji su međusobno povezani u jednu cjelinu. Model motora je izrađen po uzoru na industrijski osamcilindrični, linijski plinski motor s prednabijanjem. Opisano je stvaranje gorive smjese, te problematika zakašnjenja paljenja pri izgaranju i posebno stvaranje gorive smjese kod Ottovih plinskih motora. Dan je opis optimizacije performansi motora te utjecaj varijabilnog otvaranja ventila te poboljšanje performansi turbopuhalom. Dan je sažeti tehnički opis glavnih dijelova i sustava navedenog motora uz navedene glavne tehničke karakteristike motora. Za provedbu simulacija rada motora korišten je računalni program Engine Simulation britanske tvrtke Lotus Engineering. Usporedbom rezultata simulacije rada motora s vrijednostima snage i okretnog momenta stvarnog motora zaključilo se da je izrađeni model motora valjan te da vjerno opisuje rad stvarnog motora uz mala odstupanja vrijednosti dobivenih simulacijom od stvarnih vrijednosti motora. Također su se usporedili rezultati simulacije rada motora sa i bez hladnjaka stlačenog zraka.The thesis describes a zero-dimensional model of the turbocharged Waukesha H24GL gas engine. It also briefly describes the models used for engine simulation and the advantages and disadvantages of certain types of models. Mathematical models of each of the main parts of the engine that are interconnected into a single unit are described. The engine model is modelled after an industrial eight-cylinder in-line turbocharged gas engine. The formation of the fuel mixture in general as well as the ignition delay during combustion and the formation of the fuel mixture in Otto gas engines in particular are described. A description of the optimization of engine performance and the influence of variable valve opening and turbocharger performance optimization is given. A brief technical description of the main parts and systems of the analysed engine is given along with the main technical characteristics of the engine. The Engine Simulation computer program from the British company Lotus Engineering was used to perform simulations of engine operation. By comparing the results of the engine operation simulation with the power and torque values of the real engine, it was concluded that the created engine model is valid and satisfactorily describes the operation of the real engine with minor deviations of the values obtained by the simulation from the actual engine values. The results of the simulation of the engine operation with and without the intercooler were also compared