Simulation of Performances of the Diesel Engine while Cutting off Fuel Delivery in one Cylinder

Raspoloživost propulzijskoga dizelskog motora u pogledu snage ili bilo koje druge značajke, pri raznim eksploatacijskim uvjetima utvrđuje se proračunima, a potvrđuje empirijskim metodama. Računalno-simulacijski modeli veoma su važni za takve analize. Računalno-simulacijski model brodskoga propulzijskog dizelskog motora osnovan na matematičkom modelu, prikazan je u ovom radu [1]. Model je upotrijebljen za analizu stacionarnih i dinamičkih uvjeta rada sporohodnoga propulzijskog dizelskog motora s prednabijanjem i brodskoga vijčanog propulzora s nepomičnim krilima. Model je izrađen uz uporabu računalne aplikacije MATLAB 7.0.4.- SIMULINK, na osnovi detaljnoga matematičkog nultodimenzionalnog modela. U ovome radu navedeni model je poslužio za raščlambu utjecaja promjene snage u pojedinim cilindrima na radne značajke motora. Promjena snage simulirana je prekidanjem dobave goriva jednome cilindru pri različitim opterećenjima motora i različitim ograničenjima poluge goriva. Analizom rezultata simulacije utvrđene su granice radnih značajka motora i sigurna pogonska stanja.Availability of propulsion diesel engine such as power or any other characteristics, under different exploitation conditions is determined by calculations, and is confirmed by empirical methods. Computer simulation models are very important for such analyses. The computer-simulation model of ship propulsion diesel engine based on mathematical model has been presented in the work [1]. The model is applied in the analysis of the static and dynamic operating conditions of the turbo-charged slowspeed diesel propulsion engine and the fixed blade propeller. The model was created by applying computer program MATLAB 7.0.4.-SIMULINK, and according the detailed mathematical zero-dimensional model. In this paper, the aimed model is used for analyzing the influence of the power changing of one of the cylinder on the engine performance. The power changing has been simulated by cutting of fuel delivery to one cylinder under different loading conditions and by the different limit of fuel rack. By analyzing the results of the simulation, the limits of engine working parameters and safety boundary conditions have been determined