Advanced Plasma-based lgnition Strategies for Future Clean Combustion Engines
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Internal combustion engines will continue to play an important role in transportation for decades to come because of the high onboard energy density. For present passenger vehicles, efforts have been made to reduce the cold start emissions and improve engine efficiency. To reach such goals, lean and diluted mixtures are needed to reduce the chemical reactivity of the mixture,so a higher engine compression ratio can be used to improve thermal efficiency, The decreased flame temperature of the lean/diluted mixtures are also beneficial for NOx reduction. Strong in-cylinder flow is needed to increase flame propagation speed for efficient and complete combustion process. Strong ignition sources are needed to provide robust ignition to support the combustion process. in this paper, the application of advanced plasma-based ignition strategies are reviewed, with special attention to the on-demand plasma energy profiling, which has flexible control over discharge duration and current amplitudes, The ignition performance of multi-site ignition is compared with on-demand energy profiling under cold start and engine idling conditions. For heavy-duty applications burning low and zero carbon renewable fuels with less chemical reactivity, such as ammonia and natural gas, a novel ignition source with remote chamber and detonation tube is also demonstrated for the first time. The air-fue mixture in the remote ignition chamber can be ignited, and the flame front can propagate and accelerate along the detonation tube to detonation stage, known as the deflagration-to-detonation transition, The high-speed detonation wave has much stronger ignition capability to improve combustion efficiency of mixture with low chemical reactivates.
Dr Ming Zheng is a Professor at the Department of Mechanical, Automotive & Materials Engineering of the University of Windsor, He was an NSERC/Ford Senior Industrial Research Chair and a two-term Canada Research Chair in Clean Engine Technologies. For his contributions to the automotive industry, he is elected SAE Fellow and ASME Fellow. Dr Ming Zheng is internationally renowned authority in cleaner combustion engines. He received his PhD in 1993 from the University of Calgary; NSERC-JSPS Postdoctoral fellow1995 from Hokkaido University. Dr. Zheng has expertise in sustainable propulsion of high-efficiency engine development, renewable fuel management, adaptive combustion control, emission control, and alternative/biofuel including renewable fuels, low carbon and non-carbon fuel.
He holds 35 patents on reactivity-controlled and dual-fuel combustion, high-power ignition and control; and a variety of active flow control converters for the exhaust after-treatment.His innovations have produced significant impacts to the automotive industry, on the design and development of future clean and efficient powertrains. His research findings have significant influences on the industrial and academic research societies worldwide. His patented technologies showcase the design and development of sustainable and efficient products with ultra clean engine-out emissions, His breakthroughs in on-demand ignition energy management for adapting low carbon fuels have effectively expanded current engine scopes towards carbon neutral power and propulsion.
