FLUID MOTION: EFFECT ON CYCLE-TO-CYCLE COMBUSTION VARIATION, FLAME DEVELOPMENT, AND SPARK DELIVERY IN SPARK-IGNITION ENGINES.
Title | FLUID MOTION: EFFECT ON CYCLE-TO-CYCLE COMBUSTION VARIATION, FLAME DEVELOPMENT, AND SPARK DELIVERY IN SPARK-IGNITION ENGINES. PDF eBook |
Author | PHILIP SHAFER KELLER |
Publisher | |
Pages | 240 |
Release | 1991 |
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in the determination of the cycle-resolved mean velocity, the greater the correlation.
The Influence of Fluid Motion on Flame Kernel Development and Cyclic Variation in a Spark Ignition Engine
Title | The Influence of Fluid Motion on Flame Kernel Development and Cyclic Variation in a Spark Ignition Engine PDF eBook |
Author | Matthew J. Hall |
Publisher | |
Pages | 14 |
Release | 1989 |
Genre | Flame |
ISBN |
STUDY OF SPARK DISCHARGE AND CYCLE-TO-CYCLE COMBUSTION VARIATIONS USING OPTICAL DIAGNOSTICS
Title | STUDY OF SPARK DISCHARGE AND CYCLE-TO-CYCLE COMBUSTION VARIATIONS USING OPTICAL DIAGNOSTICS PDF eBook |
Author | |
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Release | 2020 |
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Abstract : Combustion plays a dominant role in power generation and transportation. In spark ignition (SI) engines, the combustion process is originated from an electrical discharge within the spark plug electrodes. One important physical parameter affecting the spark discharge process and subsequent flame kernel propagation is the in-cylinder crossflow motion. Increasing the crossflow velocity generates turbulence in the combustion chamber. This is attributed to the spark channel being elongated at higher crossflow velocities. A longer spark channel length contains a higher discharge voltage which can induce a new re-spark across the spark plug electrodes. Furthermore, a longer spark channel expands the spatial spark discharge volume, affecting the initial formation and propagation of the flame kernel. Understanding the flame evolution physics in the cylinder and the corresponding cyclic variability in the combustion process under turbulent flows are of utmost importance to increasing efficiency of advanced engine technologies. In particular, knowledge of the cycle-to-cycle variations in combustion could potentially improve engine efficiency and performance including fuel economy, driveability, and emissions. Therefore, the main goal of this research is to understand the effects of high-speed crossflows on the initiation and development of the spark discharge and cyclic flame kernel propagation using optical diagnostics. Ignition tests are conducted in an optically accessible constant-volume spray and combustion vessel under various high-speed crossflows, pressures, and spark plug orientations to quantify the spark discharge process including the spark discharge channel, discharge duration, and glow discharge energy. Results show that increasing high-speed crossflows shortens the discharge duration while the glow discharge energy increases. A correlation between the spark channel length and electrical measurements is provided. Furthermore, cyclic variability is studied in an optical SI engine with retarded ignition timing under stoichiometric conditions. A spark sweep and various in-cylinder tumble motions are performed to develop a fundamental understanding of the cyclic variability at different operating conditions. Here, optical diagnostics, in-cylinder pressure measurements, and ion signal waveforms are analyzed to quantify the cycle-to-cycle variations of candidate combustion metrics including indicated mean effective pressure (IMEP) and mass fraction burned (MFB). Results provide a set of correlations among in-cylinder pressure measurements, ion signal data, and flame front data obtained from high-speed combustion images. It is also found that the cyclic variability is amplified with retarding the spark timing.
Effect of Turbulence on Flame Initiation and Combustion Cyclic Variation in Spark Ignition Engines
Title | Effect of Turbulence on Flame Initiation and Combustion Cyclic Variation in Spark Ignition Engines PDF eBook |
Author | Mazen Hammoud |
Publisher | |
Pages | 242 |
Release | 1996 |
Genre | Spark ignition engines |
ISBN |
Quasi-Dimensional Simulation of Spark Ignition Engines
Title | Quasi-Dimensional Simulation of Spark Ignition Engines PDF eBook |
Author | Alejandro Medina |
Publisher | Springer Science & Business Media |
Pages | 201 |
Release | 2013-08-20 |
Genre | Technology & Engineering |
ISBN | 1447152891 |
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
Previews of Heat and Mass Transfer
Title | Previews of Heat and Mass Transfer PDF eBook |
Author | |
Publisher | |
Pages | 624 |
Release | 1992 |
Genre | Heat |
ISBN |
Modelling Spark Ignition Combustion
Title | Modelling Spark Ignition Combustion PDF eBook |
Author | P. A. Lakshminarayanan |
Publisher | Springer Nature |
Pages | 678 |
Release | |
Genre | |
ISBN | 9819706297 |