Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Compression ratio effect on methane HCCI combustion

Conference ·
 [1]; ; ;
  1. LLNL
+ Show Author Affiliations
We have used the HCT (Hydrodynamics, Chemistry and Transport) chemical kinetics code to simulate HCCI (homogeneous charge compression ignition) combustion of methane-air mixtures. HCT is applied to explore the ignition timing, bum duration, NOx production, gross indicated efficiency and gross IMEP of a supercharged engine (3 atm. Intake pressure) with 14:1, 16:l and 18:1 compression ratios at 1200 rpm. HCT has been modified to incorporate the effect of heat transfer and to calculate the temperature that results from mixing the recycled exhaust with the fresh mixture. This study uses a single control volume reaction zone that varies as a function of crank angle. The ignition process is controlled by adjusting the intake equivalence ratio and the residual gas trapping (RGT). RGT is internal exhaust gas recirculation which recycles both thermal energy and combustion product species. Adjustment of equivalence ratio and RGT is accomplished by varying the timing of the exhaust valve closure in either 2-stroke or 4-stroke engines. Inlet manifold temperature is held constant at 300 K. Results show that, for each compression ratio, there is a range of operational conditions that show promise of achieving the control necessary to vary power output while keeping indicated efficiency above 50% and NOx levels below 100 ppm. HCT results are also compared with a set of recent experimental data for natural gas.
Research Organization:
Lawrence Livermore National Laboratory, Livermore, CA
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EE)
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
3421
Report Number(s):
UCRL-JC-131908; EE0402000; ON: DE00003421
Country of Publication:
United States
Language:
English

References (18)

A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine conference October 1967
Improving the Exhaust Emissions of Two-Stroke Engines by Applying the Activated Radical Combustion conference February 1996
Modeling Combustion in Compression Ignition Homogeneous Charge Engines conference February 1992
Analysis on Fuel Economy Improvement and Exhaust Emission Reduction in a Two-Stroke Engine by Using an Exhaust Valve
  • Asai, Masahiro; Kurosaki, Takaharu; Okada, Kazunori
  • Small Engine Technology Conference & Exposition, SAE Technical Paper Series https://doi.org/10.4271/951764
conference September 1995
Homogeneous-Charge Compression-Ignition (HCCI) Engines conference September 1989
Control of Engine Load via Electromagnetic Valve Actuators conference March 1994
Combustion and Emission Characteristics of Premixed Lean Diesel Combustion Engine
  • Nakagome, Keiichi; Shimazaki, Naoki; Niimura, Keiichi
  • International Congress & Exposition, SAE Technical Paper Series https://doi.org/10.4271/970898
conference February 1997
Active Thermo-Atmosphere Combustion (ATAC) - A New Combustion Process for Internal Combustion Engines
  • Onishi, Shigeru; Jo, Souk Hong; Shoda, Katsuji
  • 1979 Automotive Engineering Congress and Exposition, SAE Technical Paper Series https://doi.org/10.4271/790501
conference February 1979
Compression-Ignited Homogeneous Charge Combustion conference February 1983
The Autoignition Chemistry of Paraffinic Fuels and Pro-Knock and Anti-Knock Additives: A Detailed Chemical Kinetic Study
  • Westbrook, Charles K.; Pitz, William J.; Leppard, William R.
  • International Fuels & Lubricants Meeting & Exposition, SAE Technical Paper Series https://doi.org/10.4271/912314
conference October 1991
A Low Pressure Pneumatic Direct Injection Two-Stroke Engine by Activated Radical Combustion Concept conference February 1998
Homogeneous Charge Compression Ignition of Diesel Fuel
  • Ryan, Thomas W.; Callahan, Timothy J.
  • International Fuels & Lubricants Meeting & Exposition, SAE Technical Paper Series https://doi.org/10.4271/961160
conference May 1996
Combustion and Emission Characteristics of Multiple Stage Diesel Combustion
  • Hashizume, Takeshi; Miyamoto, Takeshi; Hisashi, Akagawa
  • International Congress & Exposition, SAE Technical Paper Series https://doi.org/10.4271/980505
conference February 1998
Autoignition chemistry of the hexane isomers: An experimental and kinetic modeling study report June 1995
Modeling of homogeneous charge compression ignition (HCCI) of methane report May 1997
A detailed chemical kinetic reaction mechanism for the oxidation of iso-octane and n-heptane over an extended temperature range and its application to analysis of engine knock journal January 1989
Supercharged Homogeneous Charge Compression Ignition conference February 1998
Autoignition Chemistry of C4 Olefins Under Motored Engine Conditions: A Comparison of Experimental and Modeling Results
  • Pitz, W. J.; Westbrook, C. K.; Leppard, W. R.
  • International Fuels & Lubricants Meeting & Exposition, SAE Technical Paper Series https://doi.org/10.4271/912315
conference October 1991

Similar Records

Compression ratio effect on methane HCCI combustion
Journal Article · Thu Jul 01 00:00:00 EDT 1999 · Journal of Engineering for Gas Turbines and Power · OSTI ID:678033
Modeling of homogeneous charge compression ignition (HCCI) of methane
Technical Report · Thu May 01 00:00:00 EDT 1997 · OSTI ID:630880
A Simple HCCI Engine Model for Control
Conference · Thu Jun 29 00:00:00 EDT 2006 · OSTI ID:896610

Related Subjects

40 CHEMISTRY
Combustion
Natural Gas
Reaction Kinetics