Modeling For Working Cycle Of 6S60MC Marine Diesel Engine With System Simulation Studies

The mathematical modeling of internal combustion engine working process is important for diesel engine performance analysis. Based on the physical model and working principle of internal combustion engine systems, a mathematical model of diesel engine is built using differential equation to describe the practical work process of the various sub-systems. The trends of parameters changing of diesel engine can be predicted by using this model. It is powerful tool for studying the internal combustion engine capability, and it can effectively guide the design and the test work of internal combustion engine.Based on the working principle of diesel engine, the thermodynamics and the aerodynamics, this thesis builds a dynamic mathematical model for working process of MAN B&W 6S60MC diesel engine which is a type of diesel engine-widely used on ships at present time. System simulation studies on this type of diesel engine are useful for the application. For modeling purpose a diesel engine is divide into five independent thermodynamically sub-systems, between every two sub-systems, substance and the energy are exchanged through the boundary. By analyzing the parameters of heat release rate, thermodynamic character of medium, heat transfer, flowage of medium and related affects of the working process of diesel engine, and by using energy-conservation equation, mass-conservation equation and gas law, mathematical models for these thermodynamic sub-systems are built separately. Using numerical calculation method, MATLAB simulink software package is developed to simulate the working process of this diesel engine. At last the parameter curves which shown as p -φ graph of this engine are obtained. The p -φ graphs are working stably under different loads such as 25%, 50%, 75% and 100% rate of full power. The simulation results are compared with the p - φ graph witch were measured actually during diesel engine tests, and the two results are quite close.At present, the Protocol adopted in 1997 included the new Annex VI of MARPOL 73/78, which entered into force on 19 May 2005, is used to control the SOx and NOx emission from diesel engines. The NOx content in exhaust gas from diesel engine is relative to the parameters which affect the diesel engines' working condition such as...