Characteristics of Knock in Hydrogen-Oxygen-Argon SI Engine

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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 ... continued below

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Killingsworth, N; Rapp, V; Flowers, D; Aceves, S; Chen, J & Dibble, R February 23, 2010.

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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.

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PDF-file: 9 pages; size: 1 Mbytes

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  • Presented at: Western States Section of the Combustion Institute Spring 2010 Meeting, Boulder, CO, United States, Mar 21 - Mar 23, 2010

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  • Report No.: LLNL-CONF-424554
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 975232
  • Archival Resource Key: ark:/67531/metadc926378

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Office of Scientific & Technical Information Technical Reports

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  • February 23, 2010

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 22, 2016, 10:12 p.m.

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Killingsworth, N; Rapp, V; Flowers, D; Aceves, S; Chen, J & Dibble, R. Characteristics of Knock in Hydrogen-Oxygen-Argon SI Engine, article, February 23, 2010; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc926378/: accessed August 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.