eprintid: 3670 rev_number: 2 eprint_status: archive userid: 1 dir: disk0/00/00/36/70 datestamp: 2023-11-09 15:51:56 lastmod: 2023-11-09 15:51:56 status_changed: 2023-11-09 15:47:21 type: article metadata_visibility: show creators_name: Rahman, M.M. creators_name: Hamada, K.I. creators_name: A. Aziz, A.R. title: Characterization of the time-averaged overall heat transfer in a direct-injection hydrogen-fueled engine ispublished: pub keywords: Combustion pro-cess; Equivalence ratios; Flow and heat transfer; Heat transfer characteristics; Heat transfer process; Hydrogen-fueled engines; Start of injections; Time-averaged, Combustion; Computer simulation; Direct injection; Hydrogen; Nusselt number, Engines note: cited By 32 abstract: This paper presents a description of the time-averaged heat transfer in a direct-injection hydrogen-fueled engine. A computer simulation of the overall heat transfer process within the in-cylinder was run. The experimental results were used to validate the adopted numerical model. One-dimensional gas dynamics were used to describe the flow and heat transfer in the components of the engine model. The engine model was simulated while varying the engine speed, equivalence ratio (�), and start of injection (SOI) timing, respectively, as follows: 1800 � rpm � 5000, 0.2 � � � 1.2, and 130°� SOI � 70°before top dead center. The baseline model of the hydrogen-fueled engine was verified through the experimental results, and reasonable agreement was achieved. The results show that the equivalence ratio has a significant impact on the time-averaged heat transfer characteristics. This is a unique behavior that appears in the case of hydrogen-fueled engines due to the wide flammability range. Delaying the injection timing caused different behavior of the time-averaged characteristics of heat transfer. This is an indication of remarkably poor combustion because there is insufficient time for fuel injection before the initiation of the combustion process. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. date: 2013 official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84875366822&doi=10.1016%2fj.ijhydene.2013.01.136&partnerID=40&md5=ca32642d3a8d275d1ef6748a07cb38a1 id_number: 10.1016/j.ijhydene.2013.01.136 full_text_status: none publication: International Journal of Hydrogen Energy volume: 38 number: 11 pagerange: 4816-4830 refereed: TRUE issn: 03603199 citation: Rahman, M.M. and Hamada, K.I. and A. Aziz, A.R. (2013) Characterization of the time-averaged overall heat transfer in a direct-injection hydrogen-fueled engine. International Journal of Hydrogen Energy, 38 (11). pp. 4816-4830. ISSN 03603199