The use of engine cycle simulations is an important aspect of engine development, and yet there is limited comprehensive documentation available on the formulations, solution procedures, and detailed results. Since beginning in the 1960s, engine cycle simulations have evolved to their current highly sophisticated status. With the concurrent development of fast and readily available computers, these simulations are used in routine engine development activities throughout the world. This book provides an introduction to basic thermodynamic engine cycle simulations and provides a substantial set of results. This book is unique and provides a number of features not found elsewhere, including:
● comprehensive and detailed documentation of the mathematical formulations and solutions required for thermodynamic engine cycle simulations;
● complete results for instantaneous thermodynamic properties for typical engine cycles;
● self-consistent engine performance results for one engine platform;
● a thorough presentation of results based on the second law of thermodynamics;
● the use of the engine cycle simulation to explore a large number of engine design and operating parameters via parametric studies;
● results for advanced, high efficiency engines;
● descriptions of the thermodynamic features that relate to engine efficiency and performance;
● a set of case studies that illustrate the use of engine cycle simulations—these case studies consider engine performance as functions of engine operating and design parameters;
● a detailed evaluation of nitric oxide emissions as functions of engine operating parameters and design features.
Although this book focuses on the spark-ignition engine, the majority of the development and many of the results are applicable (with modest adjustments) to compression-ignition (diesel) engines. In fact, the major difference between the two engines relates to the combustion process, and these differences are mostly related to the details and not the overall process. But to be consistent, extrapolations to compression-ignition engines are largely avoided. The examples and case studies are based on an automotive engine, but the procedures and many of the results are valid for other engine classifications. In addition, the thermodynamic simulation could be used for these other applications. Many of the results are fairly general and would be applicable to most engines. For example, results highlighting the difficulty of converting thermal energy into work (a consequence of the fundamental thermodynamics) applies to all engines.