Characteristics of knock in hydrogen-oxygen-argon SI engine

Nick J. Killingsworth, Vi H. Rapp, Daniel L. Flowers, Salvador M. Aceves, J. Y. Chen, Robert Dibble

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations

Abstract

A promising approach for improving the efficiency of internal combustion engines is to employ a working fluid with a high specific heat ratio such as the noble gas argon. Moreover, all harmful emissions are eliminated when the intake charge is composed of oxygen, nonreactive argon, and hydrogen fuel. Previous research demonstrated indicated thermal efficiencies greater than 45% at 5.5 compression ratio in engines operating with hydrogen, oxygen, and argon. However, knock limits spark advance and increasing the efficiency further. Conditions under which knock occurs in such engines differs from typical gasoline fueled engines. In-cylinder temperatures using hydrogen-oxygen-argon are higher due to the high specific heat ratio and pressures are lower because of the low compression ratio. Better understanding of knock under these conditions can lead to operating strategies that inhibit knock and allow operation closer to the knock limit. In this work we compare knock with a hydrogen, oxygen, and argon mixture to that of air-gasoline mixtures in a variable compression ratio cooperative fuels research (CFR) engine. The focus is on stability of knocking phenomena, as well as, amplitude and frequency of the resulting pressure waves.

Original languageEnglish (US)
Title of host publicationWestern States Section of the Combustion Institute Spring Technical Meeting 2010
PublisherWestern States Section/Combustion Institute
Pages772-778
Number of pages7
ISBN (Electronic)9781617384196
StatePublished - Jan 1 2010
EventWestern States Section of the Combustion Institute Spring Technical Meeting 2010 - Boulder, United States
Duration: Mar 22 2010Mar 23 2010

Publication series

NameWestern States Section of the Combustion Institute Spring Technical Meeting 2010

Other

OtherWestern States Section of the Combustion Institute Spring Technical Meeting 2010
CountryUnited States
CityBoulder
Period03/22/1003/23/10

Keywords

  • Argon
  • Hydrogen
  • Internal combustion engine
  • Knock
  • Noble gas

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Mechanical Engineering

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