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, burn duration, NOx, production, gross indicated efficiency and gross IMEP of a supercharged engine (3 atm. intake pressure) with 14:1, 16:1 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 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 two-stroke or four-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 percent and NOx levels below 100 ppm. HCT results are also compared with a set of recent experimental data for natural gas.

Amsden, A. A., 1993, “KIVA-3: A KIVA Program with Block-Structured Mesh for Complex Geometries,” Los Alamos National Laboratory Report LA-12503-MS.
Asai, M., Kurosaki, T., and Okada, K., 1995, “Analysis of Fuel Economy Improvement and Exhaust Emission Reduction in a Two-Stroke Engine by Using an Exhaust Valve,” SAE Paper 951764.
Automotive Engineering, 1997, “Honda Readies Activated Radical Combustion Two-Stroke Engine for Production Motorcycle,” December, pp. 101–102.
Christensen, M., Johansson, B., Amneus, P., and Mauss, F., 1998, “Supercharged Homogeneous Charge Compression Ignition,” SAE Paper 980787.
Curran, J. H., Gaffuri, P., Pitz, W. J., Westbrook, C. K., and Leppard, W. R., 1995, “Autoignition Chemistry of the Hexane Isomers: An Experimental and Kinetic Modeling Study,” SAE Paper 952406.
Frenklach, M., Wang, H., Goldenberg, M. Smith, G. P., Golden, D. M., Bowman, C. T. Hanson, R. K., Gardiner, W. C., and Lissianski, V., 1995, “GRI-Mech—An Optimized Detailed Chemical Reaction Mechanism for Methane Combustion,” GRI Topical Report No. GRI-95/0058.
Gray, A. W., and Ryan, T. W., 1997, “Homogeneous Charge Compression Ignition (HCCI) of Diesel Fuel.” SAE Paper 971676.
Hashizume, T., Miyamoto, T., Akagawa, H., and Tsujimura, K., 1998, “Combustion and Emission Characteristics of Multiple Stage Diesel Combustion,” SAE Paper 980505.
Heywood, J. B., 1988, Internal Combustion Engine Fundamentals, McGraw-Hill Inc., New York.
Iida, N., 1997, “Alternative Fuels and Homogeneous Charge Compression Ignition Combustion Technology,” SAE Paper 972071.
Ishibashi, Y., and Asai, M., 1996. “Improving the Exhaust Emissions of Two-Stroke Engines by Applying the Activated Radical Concept,” SAE Paper 960742.
Ishibashi, Y., and Asai, M., 1998, “A Low Pressure Pheumatic Direct Injection Two-Stroke Engine by Activated Radical Combustion Concept,” SAE Paper 980757.
Jensen, S. P., 1994, “A Retrofit System to Convert a Locomotive to Natural Gas Operation,” Natural Gas and Alternative Fuels for Engines, ASMEICE-Vol. 21, Book No. G00830.
Kong, S. C., Ayoub, N., and Reitz, R. D., 1992, “Modeling Combustion in Compression Ignition Homogeneous Charge Engines,” SAE Paper 920512.
Lund, C. M., 1978, “Hct—A General Computer Program for Calculating Time-Dependent Phenomena Involving One-Dimensional Hydrodynamics, Transport, and Detailed Chemical Kinetics,” report UCRL-52504, Lawrence Livermore National Laboratory, Livermore, CA.
Najt, P. M., and Foster, D. E., 1983, “Compression-Ignited Homogeneous Charge Combustion,” SAE Paper 830264.
Nakagome, K., Shimazaki, N., Niimura, K., and Kobayashi, S., 1997, “Combustion and Emission Characteristics of Premixed Lean Diesel Combustion Engine,” SAE Paper 970898.
Onishi, S., Jo, S. H., Shoda, K., Jo, P. D. and Kato, S., 1979, “Active Thermo-Atmosphere Combustion (ATAC)—A New Combustion Process for Internal Combustion Engines,” SAE Paper 790501.
Pitz, W. J., Westbrook, C. K., and Leppard, W. R., 1991, “Autoignition Chemistry of C4 Olefins Under Motored Engine Conditions: A Comparison of Experimental and Modeling Results,” SAE Paper 912315.
Ryan, T. W., III, and Callahan, T. J., 1996, “Homogeneous Charge Compression Ignition of Diesel Fule,” SAE Paper 961160.
Smith, J. R., Aceves, S. M., Westbrook, C., and Pitz, W., “Modeling of Homogeneous Charge Compression Ignition (HCCI) of Methane,” Proceedings, 1997 ASME Internal Combustion Engine Fall Technical Conference, Paper No. 97-ICE-68, ICE-Vol. 29-3, ASME, New York, pp. 85–90.
Theobald, M. A., and Henry, R., 1994, “Control of Engine Load Via Electromagnetic Valve Actuators,” SAE Paper 940816.
Thring, R. H., 1989, “Homogeneous Charge Compression Ignition (HCCI) Engines,” SAE Paper 892068.
Westbrook, C. K., Pitz, W. J., and Leppard, W. R., 1991, “The Autoignition Chemistry of Paraffinic Fuels and Pro-knock and Anti-knock Additives: A Detailed Chemical Kinetic Study,” SAE Paper 912314.
Westbrook, C. K., Warnatz, J., and Pitz, W. J., 1988, “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,” Proceedings, Twenty-Second Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, PA, p. 893.
Woschni, G., 1967, “Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine,” SAE Paper 670931.
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