ANALYSIS CORRECTITUDE SIMULATORS PROGRAMS OF DIESELSIM DPS 100-GFCA, DPS 100 L-MC AND CALCULATING HEAT LOAD LIMIT CHARACTERISTIC FOR THIS ENGINES
This study work has been done on simulators of DPS 100-GFCA, DPS 100 L-MC type, Kongsberg Maritime (Norway). They simulate the working process of modern long-stroke diesel engines 6L 90GFCA and 5L90MC, B&W and MAN B&W as a part of supertanker propulsion plant, including all elements and systems of propulsion plant at vary operating conditions. The programs show the complex interaction of factors and characteristics when solving complex tasks, defining co-operation of diesel engine and propulsion system's elements. This investigation is necessary for analyses the efficiency, completeness and adequacy of solving problems that are reproduced by simulators in comparison with real processes in propulsion plant. The study purpose was the checking of programs correctness. The solving of such problems can be attributed to the category of scientific research. The practical significance of the study work consists of correcting of obtained by simulators data and to define some data of individual tasks, especially in the case of limit characteristics of the heat load. Marked mistakes in the working process simulation can by useful for the designers of the new generation simulators. This information contains analysis of the correctness of computer programs, calculating working process changing in simulated diesel engines under different service conditions. In the course of study work the comparative analysis of simulators data of work process was made under normal and malfunction conditions of simulated elements. The number of mistakes devoted to the problem of heavy screw characteristics in ice conditions was also represented in the study work.There are many mistakes and simplifications in some parameters behavior in case of malfunction at some elements of the engine. In programs the influence of back pressure after gas turbine, as a major factor, and air resistance of cylinder at air supply of the engine are omitted. There are a lot of mistakes in analyzing fuel oil injection parts malfunction. For exemplify, the leakage from wore plunger and barrel of fuel injection pump and injector simulator reproduce as simple lost of fuel dosage with decreasing exhaust gas and cylinder wall temperature. Really this faults lead to defective fuel atomizing and influence combustion and working process. As a result will be dropping time injection open, time begin ignition and combustion process degradation with increasing exhaust gas and cylinder wall temperature. This malfunction and especially leaking injector needle are the most often at operating condition and always lead to increasing exhaust gas temperature and heat load of this cylinder. Existing programs has no characteristics to limit heat load. They are calculated by using data from 6S50MC, UECL, UECLS2 diesels as mathematical model for each simulated engine. Then they are added for use. When the audience of different level competence works on simulators, its work should provide competent and comprehensive understanding of complex processes of ship's machinery. Many errors and simplifications in behaviour some parameters in case of malfunction at some elements of engine are eventual and not negative only. As known, the most effective form of teaching is interactive mode. It is recommended for instructor to analyze and discuss simulators data to consider the questions in all its aspects with cadets and engineers after making every task.