Modeling of homogeneous charge compression ignition (HCCI) of methane

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The operation of piston engines on a compression ignition cycle using a lean, homogeneous charge has many potential attractive features. These include the potential for extremely low NO{sub x} and particulate emissions while maintaining high thermal efficiency and not requiring the expensive high pressure injection system of the typical modem diesel engine. Using the HCT chemical kinetics code to simulate autoignition of methane-air mixtures, we have explored the ignition timing, burn duration, NO{sub x} production, indicated efficiency and power output of an engine with a compression ratio of 15:1 at 1200 and 2400 rpm. HCT was modified to include the ... continued below

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20 p.; Other: FDE: PDF; PL:

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Smith, J.R.; Aceves, S.M.; Westbrook, C. & Pitz, W. May 1, 1997.

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Description

The operation of piston engines on a compression ignition cycle using a lean, homogeneous charge has many potential attractive features. These include the potential for extremely low NO{sub x} and particulate emissions while maintaining high thermal efficiency and not requiring the expensive high pressure injection system of the typical modem diesel engine. Using the HCT chemical kinetics code to simulate autoignition of methane-air mixtures, we have explored the ignition timing, burn duration, NO{sub x} production, indicated efficiency and power output of an engine with a compression ratio of 15:1 at 1200 and 2400 rpm. HCT was modified to include the effects of heat transfer. This study used a single control volume reaction zone that varies as a function of crank angle. The ignition process is controlled by varying the intake equivalence ratio and varying the residual gas trapping (RGT). RGT is internal exhaust gas recirculation which recycles both heat and combustion product species. It is accomplished by varying the timing of the exhaust valve closure. Inlet manifold temperature was held constant at 330 Kelvins. Results show that there is a narrow range of operational conditions that show promise of achieving the control necessary to vary power output while keeping indicated efficiency above 50% and NO{sub x} levels below 100 ppm.

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20 p.; Other: FDE: PDF; PL:

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OSTI as DE98050858

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  • Internal combustion engine 1997 fall conference, Madison, WI (United States), 27 Sep - 1 Oct 1997

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  • Other: DE98050858
  • Report No.: UCRL-JC--127387
  • Report No.: CONF-9709131--
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/630880 | External Link
  • Office of Scientific & Technical Information Report Number: 630880
  • Archival Resource Key: ark:/67531/metadc690671

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  • May 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 17, 2016, 2:35 p.m.

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Smith, J.R.; Aceves, S.M.; Westbrook, C. & Pitz, W. Modeling of homogeneous charge compression ignition (HCCI) of methane, report, May 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc690671/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.