Michael Brear

A comparative study of directly injected, spark ignition engine performance and emissions with natural gas, gasoline and charge dilution

T Kar, Z Zhou, M Brear, Y Yang, M Khosravi, J Lacey

Journal article  |  2021  |  Fuel

This paper presents an experimental study of a 4-cylinder, downsized and boosted, spark ignition engine fuelled by either directly..

The significance of octane numbers to drive cycle fuel efficiency

Zhenbiao Zhou, Tanmay Kar, Yi Yang, Michael Brear, Thomas G Leone, James E Anderson, Michael H Shelby, Eric Curtis, Joshua Lacey

Journal article  |  2021  |  FUEL

Modern spark-ignition engines are knock-limited over a significant fraction of their operating map. The efficiency loss induced by..

Large-eddy simulation of methane direct injection using the full injector geometry

MR Yosri, JZ Ho, M Meulemans, M Talei, RL Gordon, MJ Brear, D Cosby, JS Lacey

Journal article  |  2021  |  FUEL

Understanding the mixing process of under-expanded gaseous-fuel jets from an outward opening injector is essential for developing ..

Mapping K factor variations and its causes in a modern, spark-ignition engine

Zhenbiao Zhou, Tanmay Kar, Yi Yang, Michael Brear, Jingran Xu, Joshua Lacey, Thomas Leone, James Anderson, Michael Shelby, Eric Curtis

Journal article  |  2021  |  FUEL

The Research Octane Number (RON) and the Motor Octane Number (MON) are primary fuel properties that characterize gasoline's knock ..

The impact of chemical modelling on turbulent premixed flame acoustics

D Brouzet, M Talei, MJ Brear, B Cuenot

Journal article  |  2021  |  JOURNAL OF FLUID MECHANICS

Direct numerical simulations are used to study the impact of chemical modelling on the flame dynamics and the sound generated by t..

Flash vaporization of propane in an optically accessible, directly injected engine

J Lacey, H Aditiya, F Poursadegh, M Brear, R Gordon, C Lakey, B Butcher, S Ryan

Journal article  |  2021  |  International Journal of Engine Research

This article presents an experimental and thermodynamic analysis of the direct injection of propane in an optically accessible var..

Impact of operating uncertainty on the performance of distributed, hybrid, renewable power plants

Abbas Ihsan, Michael J Brear, Matthew Jeppesen

Journal article  |  2021  |  APPLIED ENERGY

This paper studies the performance of distributed, on-grid and off-grid, hybrid renewable power plants with short time scale opera..

Hydrogen oxidation near the second explosion limit in a flow reactor

Zhewen Lu, Junqiu Jiang, Yi Yang, Joshua Lacey, Michael J Brear

Journal article  |  2021  |  PROCEEDINGS OF THE COMBUSTION INSTITUTE

The oxidation of H2 near its second explosion limit in a turbulent flow reactor at pressures of 1 to 8 bar, temperatures of 950 K ..

An experimental and numerical study of a hydrogen fueled, directly injected, heavy duty engine at knock-limited conditions

J Mortimer, S Yoannidis, F Poursadegh, Z Lu, M Brear, Y Yang, D Etherington, M Heijkoop, J Lacey

Conference Proceedings  |  2021  |  ASME 2020 Internal Combustion Engine Division Fall Technical Conference, ICEF 2020

This paper presents an experimental and numerical study of a directly injected, spark-ignited (DI SI), heavy duty hydrogen fueled ..

Reduced chemistry for sound generation by planar annihilation in premixed methane/hydrogen flames

Jen Zen Ho, Mohsen Talei, Robert L Gordon, Michael J Brear

Journal article  |  2021  |  PROCEEDINGS OF THE COMBUSTION INSTITUTE

Sound generation by planar flame annihilation for methane/hydrogen/air premixed flames was studied using one-dimensional fully-res..