Two-Stroke Diesel Engine Simulation Program.

摘要

A computer program simulating a two-stroke diesel engine is developed and documented. The program is suitable for simulating the diesel core of a high-output combined-cycle diesel engine. The engine cylinder and the intake and exhaust ports are defined as independent thermodynamic systems and the mass energy equations for these systems are developed. A single zone combustion model is used and perfect mixing during scavenging is assumed. The program input requirements and output results are discussed. A sample case is provided for an opposed piston, uniflow scavenged two-stroke diesel engine. The mathematical model considers the thermodynamics and fluid mechanics of the working fluid from the entrance of the intake port to the exit of the exhaust port. The program can predict the effect on engine performance of changes in parameters such as speed, boost pressure, valve timing, and fueling level. The program output provides information about power output, brake mean effective pressure (BMEP), heat transfer losses, and cylinder pressures and temperatures. The program was written in modular form so that the submodels could be modified or replaced without requiring program alteration. This report discusses the mathematical model used in the program and describes the subroutines that make up the model. Input requirements are stated and the output listing is explained. A sample program run is also provided. (kr)