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This book contains the theory and computer programs for the simulation of spark ignition (SI) engine processes. It starts with the fundamental concepts and goes on to the advanced level and can thus be used by undergraduates, postgraduates and Ph. D. scholars.
Based on the simulations developed in research groups over the past years, Introduction to Quasi-dimensional Simulation of Spark Ignition Engines provides a compilation of the main ingredients necessary to build up a quasi-dimensional computer simulation scheme. Quasi-dimensional computer simulation of spark ignition engines is a powerful but affordable tool which obtains realistic estimations of a wide variety of variables for a simulated engine keeping insight the basic physical and chemical processes involved in the real evolution of an automotive engine. With low computational costs, it can optimize the design and operation of spark ignition engines as well as it allows to analyze cycle-to-cycle fluctuations. Including details about the structure of a complete simulation scheme, information about what kind of information can be obtained, and comparisons of the simulation results with experiments, Introduction to Quasi-dimensional Simulation of Spark Ignition Engines offers a thorough guide of this technique. Advanced undergraduates and postgraduates as well as researchers in government and industry in all areas related to applied physics and mechanical and automotive engineering can apply these tools to simulate cyclic variability, potentially leading to new design and control alternatives for lowering emissions and expanding the actual operation limits of spark ignition engines
This book deals with in-cylinder pressure measurement and its post-processing for combustion quality analysis of conventional and advanced reciprocating engines. It offers insight into knocking and combustion stability analysis techniques and algorithms in SI, CI, and LTC engines, and places special emphasis on the digital signal processing of in-cylinder pressure signal for online and offline applications. The text gives a detailed description on sensors for combustion measurement, data acquisition, and methods for estimation of performance and combustion parameters. The information provided in this book enhances readers' basic knowledge of engine combustion diagnostics and serves as a comprehensive, ready reference for a broad audience including graduate students, course instructors, researchers, and practicing engineers in the automotive, oil and other industries concerned with internal combustion engines. Maximizes readers' understanding of the construction, working principles, installation, signal processing and limitations of the transducers used for combustion analysis; Provides a range of different models for estimating heat release and heat transfer for combustion quality analysis; Describes statistical and chaotic methods used for combustion stability analysis and the different knock indices and combustion noise metrics evaluated from cylinder pressure signal; Reinforces concepts presented with end of chapter summary discussions and questions; Explains methods used for estimation of engine parameters such as TDC, compression ratio, air-fuel ratio, residual gas fraction and wall temperature using in-cylinder pressure measurement;.
Heat release analysis can be computed from the measured cylinder pressure at known cylinder volumes through the use of the First Law Thermodynamics and the ideal gas law. After correcting for crevice effects and heat transfer to the combustion chamber walls, the combustion heat release profile can be determined. From the combustion heat release profile, the burn rate and the mass fraction burned can be calculated for studies of knock and turbulence. The Ricardo Hydra MK III engine is instrumented, the operating properties are checked and the cylinder pressure is measured for fired and motored operating conditions at six different load and speed setpoints. The generated pressure data is then used in the Sloan Automotive Lab heat release model to determine the validity of the model for real engine data. The model is checked for scaling by load and speed. The heat release was successfully modeled using one set of model parameters for this engine operating at the different loads and speeds. (Author).
In view of the ever-increasing consumption of non-renewable vehicular fuels, it is imperative to continually improve the efficiency of Spark-Ignition (SI) engines, which power majority of the light duty vehicles in the US. Increasing the compression ratio is a well-established approach for developing fuel-efficient SI engines. However, the potential benefits of this approach are limited by engine knock, which is driven by the temperature-dependent chemical kinetics of combustion. In combination with the energy released from combustion, in-cylinder heat transfer dictates the magnitude of in-cylinder gas temperatures, thus defining the efficiency and performance of an SI engine. One-dimensional (1D) simulation tools are extensively used in the automotive industry to predict engine performance. In-cylinder heat transfer is calculated within such codes using empirical correlations originally formulated to compute the heat transfer coefficient for turbulent flow within pipes. The turbulent flow field within the combustion chamber interacts with the propagating flame front (during combustion). Consequently, the resulting flow physics is significantly more involved compared to turbulent flow within pipes. Applying a pipe-flow based correlation to estimate in-cylinder heat transfer misrepresents the actual physics, resulting in unreliable heat transfer predictions. Hence, the objective of this work is to address this deficiency by developing a fundamental 1D engine heat transfer model, which is well-grounded in the governing flow physics.
This text, by a leading authority in the field, presents a fundamental and factual development of the science and engineering underlying the design of combustion engines and turbines. An extensive illustration program supports the concepts and theories discussed.