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Seminar - Flash-boiling Spray Behavior and Combustion in Spark-Ignition Direct-Injection Engine by Professor David L.S. Hung
日期:2018 年 12 月 04 日 ( 星期二)
Time:11:00 am – 12:00 pm
Venue:EF305

Abstract:

Spark-ignition direct-injection (SIDI), also known as gasoline direct injection (GDI), engine technology has demonstrated its high potentials in improving combustion performance and fuel efficiency for the new generations of light duty vehicles worldwide. However, the cyclic variations of in-cylinder engine flows represent a significant challenge which influences the stability and emissions of SIDI engines. One effective way of suppressing the cyclic variations in SIDI engine is to design a combustion system that is robust to the root cause of engine variation over the entire engine working process. Recently, flash boiling process has been demonstrated as an effective approach to produce stable fuel spray behavior. However, the generation of stable intake flow and fuel-air mixture remains a daunting task. In this seminar, the fuel spray behavior and combustion characteristics of flash boiling spray are presented. Credited to the recent advances in laser systems, imaging hardware, and data processing algorithms, both qualitative and quantitative measurements of flow and combustion inside a real engine can be made to elucidate the in-cylinder fuel-air mixture formation, flame front development, and flame structure propagation with high temporal and spatial resolutions.

Bio-sketch:

Dr. David L.S. Hung is an Associate Dean for Graduate Education and Professor of Mechanical Engineering at the University of Michigan-Shanghai Jiao Tong University Joint Institute, with dual appointment as a professor of Institute of Automotive Engineering, School of Mechanical Engineering, at Shanghai Jiao Tong University. His research focuses on green mobility, advanced powertrain systems, fuel injection sprays and optical diagnostics. He has received research funding from agencies including China’s Ministry of Education and NSF-China. He also received numerous teaching awards for his contributions to the Joint Institute’s reform and innovation in training mechanical engineering students. He was named a Top Ten SJTU “KoGuan Professor” in 2015. Prior to working in China, he was an associate professor in the Department of Mechanical Engineering at Michigan State University. Previously he held professional positions in the US at General Motors, Delphi, and Visteon Corporations where he researched and developed powertrain components for use in advanced gasoline engines. His research projects were funded by the Department of Energy, Michigan Economic Development Corporation, and other agencies.

He is currently the Editor-in-Chief (Asia) of Atomization and Sprays and an Associate Editor of the ASME Journal of Engineering for Gas Turbines and Power. He is also a vice-chairman of the SAE Gasoline Fuel Injection Standards Committee. He is a recipient of numerous awards, including ASME Internal Combustion Engine Division Outstanding Speaker Award, SAE Henry Souther Standards Award, and SAE/InterRegs Standards and Regulations Award for Young Engineers for his contributions to develop engineering standards and regulations for the global automotive industry.

He earned his Ph.D. in mechanical engineering from Carnegie Mellon University. He is a Fellow of SAE (Society of Automotive Engineers) and a distinguished visiting fellow at the University of Oxford, sponsored by the Royal Academy of Engineering, United Kingdom.