Ignition Issues and Their Impact on Engine Performance, Efficiency and Emission
Duration: 2 Days
Improved understanding and control of ignition and thereby combustion are critical in dealing with the problems of pollutants formation, engine performance, and fuel economy. This seminar will provide you with basic knowledge and recent advances in combustion-initiation (ignition) issues to more intelligently evaluate and harness their potentials. Thermodynamic and fluid mechanical properties of the unburned charge near the spark plug and at the time of ignition strongly affect the quality of the combustion and therefore the emission of the pollutants from the engine. Furthermore, a weak ignition limits engine performance and drivability. The so-called cyclic variability, which affects and bounds the lean and knock limits of an engine design is to a great degree influenced by the ignition system. Equally important, the ignition system can and is being used to provide local in-cylinder information on air-fuel ratio, misfire, knock, and mass fraction burned in each individual cylinder. Hence, great potential exists for applications of this information for individual cylinder control strategy to attain a more fuel efficient and environmentally compatible engine.
Learning Objectives
By attending this seminar, you will be able to:
- Describe the important processes in ignition and its relation to engine
performance, efficiency, and emission
- Explain the combustion process in internal combustion engines
- Apply ignition strategies for reduction of engine pollutants
- Recognize the effects of ignition system design and engine operating
conditions on combustion and emission
- Describe the technology and the logic behind the current and future
ignition-based engine diagnostics
- Assist in the design of critical components such as combustion chambers and
exhaust systems
- Identify key design components of an ignition system for optimum combustion
chamber design and low engine emission of pollutants
Who Should Attend
This seminar will be especially valuable for engineers, technical and project managers, researchers, and academicians involved in ignition and combustion/emission aspects of the combustion engines. Currently, the design strategy of many components in these engines is affected by combustion and emission control measures to meet customer's, federal and local government's demands and regulations. Therefore, engineers working on the design of components for high efficiency and performance of combustion engines as well as those directly and indirectly involved in ignition and emission reduction strategies will highly benefit from this seminar.
Topical Outline
DAY ONE
- A Concise Background on Combustion in Spark Ignited (SI) Engines
- Cylinder pressure traces
- MBT and ignition timing
- Flame propagation issues
- Combustion characterization
- Cyclic variability
- Ignition Fundamentals
- Spark Ignition
- Function of ignition system
- Commonly used ignition systems
- What determines the amount of ignition energy
- Four Phases of Spark Ignition
- Pre-breakdown, breakdown, arc, and glow discharge
DAY TWO
- Effects of Some Key Parameters on Combustion, Emission and Performance
- Higher power and/or energy
- Longer duration discharge
- Multiple spark plugs
- Different spark plug designs
- Alternative Ignition Methods
- Corona ignition system
- Plasma-jet ignition system
- Flame-jet ignition system
- Activated radical (AR) ignition
- Others
- Diagnostic and Control Opportunities
- Use of spark voltage for monitoring combustion
- Spark spectroscopy
- Ionization measurement for engine health monitoring & diagnostics
- Ignition Systems for Highly Diluted Mixtures
- Conclusions
Instructor(s): Bruce Chehroudi
Dr. Bruce Chehroudi is currently a Principal Scientist at the Engineering Research Corporation Inc. He has been a Chief Scientist at Raytheon STX (formerly Hughes Aircraft STX) and is a former Professor of Mechanical Engineering, specializing in fluid mechanics and heat transfer, laser optical diagnostics, internal combustion engines, structure of sprays (their formation and combustion), gas turbine engines, furnace combustion, fuel injection issues (reciprocating, gas turbine, and rocket engines) and emission of pollutants. Dr. Chehroudi previously served as a Research Staff Member at Princeton Univ. where he engaged in experimental research in fluid mechanics and heat transfer of cold, vaporizing, and combusting sprays as well as characterization of turbulence in internal combustion engines using laser optical diagnostics. He was actively involved in the DISC (direct injection stratified charged) Engine Program, a cooperative project between the Department of Energy, General Motors Research Laboratory, Sandia-Livermore Combustion Laboratory, and Los Alamos Scientific Laboratory. Dr. Chehroudi established and directed an Engine Laboratory at the University of Illinois where he conducted numerous research projects to investigate the formation of pollutants and heat transfer/fluid mechanical aspects of combustion occurring in internal combustion and gas turbine engines. He is a member of Ta Beta Pi and the recipient of several SAE awards including the Arch T. Colwell Merit Award, the Ralph R. Teetor Award, the SAE Recognition Award and the SAE Forest R. McFarland Award in recognition of his contributions to the Professional Development Seminars. He has taught courses in the areas of internal combustion engines, thermodynamics, thermophysics of gas flows, combustion, and measurement system and has more than 100 publications in conferences, national and international journals. Dr. Chehroudi has a Ph.D. from Princeton University.
Fees: $1225.00
; SAE Members: $980.00 - $1103.00
1.3 CEUs
For additional information, contact SAE Customer Service at 1-877-606-7323 (724/776-4970 outside the U.S. and Canada) or at CustomerService@sae.org.
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