Physics of Turbulent Jet Ignition

Description

This book focuses on developing strategies for ultra-lean combustion of natural gas and hydrogen, and contributes to the research on extending the lean flammability limit of hydrogen and air using a hot supersonic jet. The author addresses experimental methods, data analysis techniques, and results throughout each chapter and:Explains the fundamental mechanisms behind turbulent hot jet ignition using non-dimensional analysis Explores ignition characteristics by impinging hot jet and multiple jets in relation to better controllability and lean combustion Explores how different instability modes interact with the acoustic modes of the combustion chamber. This book provides a potential answer to some of the issues that arise from lean engine operation, such as poor ignition, engine misfire, cycle-to-cycle variability, combustion instability, reduction in efficiency, and an increase in unburned hydrocarbon emissions. This thesis was submitted to and approved by Purdue University. Front Matter ....Pages i-xviii Introduction (Sayan Biswas)....Pages 1-13 Ignition Mechanisms (Sayan Biswas)....Pages 15-34 Schlieren Image Velocimetry (SIV) (Sayan Biswas)....Pages 35-64 Supersonic Jet Ignition (Sayan Biswas)....Pages 65-100 Combustion Instability at Lean Limit (Sayan Biswas)....Pages 101-127 Ignition by Multiple Jets (Sayan Biswas)....Pages 129-158 Impinging Jet Ignition (Sayan Biswas)....Pages 159-180 Flame Propagation in Microchannels (Sayan Biswas)....Pages 181-195 Summary and Outlook (Sayan Biswas)....Pages 197-202 Back Matter ....Pages 203-216