Ignition enhancement of f-24 jet fuel by a hot surface for aircraft propulsion systems

Je Ir Ryu, Austen H. Motily, Tonghun Lee, Riccardo Scarcelli, Sibendu Som, Kenneth S. Kim, Chol Bum M. Kweon

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

Abstract

Ignition enhancement of F-24 jet fuel injection into a combustion chamber with a hot surface probe is investigated with the goal of achieving reliable compression ignition engines in aircraft systems. The main purpose of this study is to understand the interactions between the fuel jet and hot surface, and to promote optimized designs of hot surface for maximum ignition probability. Therefore, the numerical simulations focus on the detailed ignition enhancement mechanisms by the hot surface and modes of ignition mechanism. Numerical models for spray, chemical kinetics, thermal boundary layer, and heating element are investigated and integrated into the simulation. A validation of enhancement mechanisms is provided by experiments in a modified rapid compression machine. Two different major mechanisms of ignition enhancement are found: autoignition and ignition propagation from the spray for low and high glow plug temperature ranges, respectively. Both ignition mechanisms are enhanced by heating of the fuel jet when it touches the hot surface. In the spray combustion mode, the ignition enhancement is significant compared to the autoignition mode. The spray combustion starts from the bottom-surface of the probe tip, which has high temperature and equivalence ratio. The residence time and spray shape affect the temperature and equivalence ratio, respectively. Based on the local properties, the optimal hot surface location can be analyzed considering both residence time and fuel quantity at the most probable ignition point.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2020 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105951
DOIs
StatePublished - 2020
EventAIAA Scitech Forum, 2020 - Orlando, United States
Duration: Jan 6 2020Jan 10 2020

Publication series

NameAIAA Scitech 2020 Forum
Volume1 PartF

Conference

ConferenceAIAA Scitech Forum, 2020
CountryUnited States
CityOrlando
Period1/6/201/10/20

ASJC Scopus subject areas

  • Aerospace Engineering

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