Optimizing hot-surface-assisted ignition performance of high-pressure f-24 fuel sprays

Austen H. Motily, Eric Wood, Tonghun Lee, Je Ir Ryu, Kenneth S. Kim, Chol Bum M. Kweon

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Advancements in fuel efficiency and emissions reduction of commercial automotive vehicles as well as progress in the fuel flexibility of heavy-duty direct-injection natural gas (DING) engines demonstrate the utility of compression ignition (CI) engines in a wide range of engineering applications. However, the demand for a multi-fuel capable engine that can be implemented in aircraft by the U.S. Army presents its own unique challenges and requires the development of advanced ignition systems. Hot surface ignition devices exhibit the ability to support reliable engine operation with various liquid fuels, but progress is limited by the complex nature of the fuel spray ignition process and associated flow field. Furthermore, a heating element shield is required to achieve acceptable performance but must maintain adequate fuel/air mixing. This study investigates the effects of both nozzle-to-heating element distance and shield design on the ignition performance of a single high-pressure F-24 fuel spray. Results demonstrate that placing the heating element tip close to the liquid penetration length results in reduced ignition delays for high surface temperatures relevant to ignition-assisting operation in an engine environment. An oblique cut 45° shield exhibits superior ignition performance than a half-tube design does, regardless of mounting position. The 45° cut design allows ignition kernels formed at the hot surface to propagate quickly out of the shield and ignite the spray plume.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2021 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Pages1-15
Number of pages15
ISBN (Print)9781624106095
StatePublished - 2021
EventAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021 - Virtual, Online
Duration: Jan 11 2021Jan 15 2021

Publication series

NameAIAA Scitech 2021 Forum

Conference

ConferenceAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021
CityVirtual, Online
Period1/11/211/15/21

ASJC Scopus subject areas

  • Aerospace Engineering

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