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Influence of Engine Speed on HCCI Combustion Characteristics using Dual-Stage Autoignition Fuels
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 20, 2009 by SAE International in United States
Annotation ability available
Homogeneous Charge Compression Ignition (HCCI) combustion characteristics of dual-stage autoignition fuels were examined over the speed range of 600 to 1700 rpm using a Cooperative Fuels Research (CFR) engine. A fuel vaporizer was used to preheat and partially vaporize the fuel inside the intake plenum. The air and fuel were well-mixed prior to entering the cylinder.
Since low temperature heat release (LTHR) is known to be an important factor that affects HCCI combustion of fuels that exhibit dual-stage autoignition behavior, a detailed heat release analyses were performed on both time and crank angle bases. At the lower and upper speeds, the operating ranges were compared as a function of air/fuel ratio (AFR) and exhaust gas recirculation (EGR) from the knocking to misfiring limits.
The AFR-EGR operating region was more limited at 1700 rpm than at 900 rpm for the commercial ULSD fuel. Combustion stability was problematic at higher engine speeds. Reduced LTHR at higher engine speeds was one source of the combustion instability. LTHR timing was sensitive to compression temperature and the LTHR magnitude was sensitive to available time for completion of LTHR reactions. Combustion timing (CA50) was advanced on a time basis, but it was retarded on a crank angle basis.
For a range of diesel-like fuels including commercial ultra low sulphur diesel and n-heptane, two methods of combustion timing control, namely intake heating and intake pressure boosting, were examined over the engine speed range. It was found that significant variations in intake heating or pressure boosting were required to control the combustion timing. While cetane number was not correlated with heating requirements in this preliminary study, the higher cetane number fuels required less intake pressure boosting for combustion timing control.
CitationHosseini, V., Neill, W., and Chippior, W., "Influence of Engine Speed on HCCI Combustion Characteristics using Dual-Stage Autoignition Fuels," SAE Technical Paper 2009-01-1107, 2009, https://doi.org/10.4271/2009-01-1107.
Homogeneous Charge Compression Ignition Engines, 2009
Number: SP-2242; Published: 2009-04-20
Number: SP-2242; Published: 2009-04-20
- Onishi S. Jo S. H. Shoda K. Jo P. D. Kato S. “Active Thermo-Atmosphere Combustion (ATAC) ∼ a New Combustion Process for Internal Combustion Engines,” SAE Paper, 790501.
- Najt P. M. Foster D. E. “Compression-Ignited Homogeneous Charge Combustion,” SAE Paper, 830264 .
- Turns S. R. 2000 An Introduction to Combustion McGraw Hill
- Leppard W. R. “The Chemical Origin of Fuel Octane Sensetivity,” SAE Paper, 902137 .
- Benson S. W. 1981 “The Kinetics and Thermochemistry of Chemical Oxidation with Application to Combustion and Flames,” Progress in Energy and Combustion Science 7 2 125 134
- Fish A. Read I. A. Affleck W. S. Haskell W. W. 1969 “The Controlling Role of Cool Flames in Two-Stage Ignition,” Combustion and Flame 13 1 39 49
- Malmberg E. W. Smith M. L. Bigler J. E. Bobbitt J. A. 1955 “A Study of Cool Flames and Associated Reactions in an Engine,” Symposium (International) on Combustion 5 1 385 392
- Aroonsrisopon T. Foster D. Morikawa T. Iida M. “Comparison of HCCI Operating Ranges for Combinations of Intake Temperature, Engine Speed and Fuel Composition,” SAE Paper, 2002-01-1924
- Pedersen T. D. Schramm J. “A Study on the Effects of Compression Ratio, Engine Speed and Equivalence Ratio on HCCI Combustion of DME,” SAE Paper, 2007-01-1860
- Milovanovic N. Chen R. Dowden R. Turner J. 2004 “An Investigation of Using Various Diesel-Type Fuels in Homogeneous Charge Compression Ignition Engines and Their Effects on Operational and Controlling Issues,” International Journal of Engine Research 5 4 297 316
- Sjöberg M. Dec J. E. “Combined Effects of Fuel-Type and Engine Speed on Intake Temperature Requirements and Completeness of Bulk-Gas Reactions for HCCI Combustion,” SAE Paper, 2003-01-3173
- Sjöberg M. Dec J. E. “Effects of Engine Speed, Fueling Rate, and Combustion Phasing on the Thermal Stratification Required to Limit HCCI Knocking” SAE Paper, 2005-01-2125
- Sjöberg M. Dec J. E. “EGR and Intake Boost for Managing HCCI Low-Temperature Heat Release over Wide Ranges of Engine Speed,” SAE Paper, 2007-01-0051
- Iida M. Hayashi M. Foster D. E. Martin J. K. 2003 “Characteristics of Homogeneous Charge Compression Ignition (HCCI) Engine Operation for Variations in Compression Ratio, Speed, and Intake Temperature While Using N-Butane as a Fuel,” Transaction of the ASME 125 472 478
- Heywood J. B. 1988 Internal Combustion Engine Fundamentals McGraw-Hill Inc.
- Cavina N. Siviero C. Suglia R. “Residual Gas Fraction Estimation: Application to a GDI Engine with Variable Valve Timing and EGR,” SAE Paper, 2004-01-2943
- Fox J. W. Cheng W. K. Heywood J. B. “A Model for Predicting Residual Gas Fraction in Spark-Ignition Engines,” SAE Paper, 931025 .
- Dec J. E. “A Computational Study of the Effects of Low Fuel Loading and EGR on Heat Release Rates and Combustion Limits in HCCI Engines,” SAE Paper, 2002-01-1309
- Hosseini V. Neill W. S. Checkel M. D. 2009 “Controlling N-Heptane HCCI Combustion with Partial Reforming: Experimental Results and Modeling Analysis” To be appeared in ASME Journal of Gas Turbine and Power
- Hosseini V. Checkel M. D. “Effect of Reformer Gas on HCCI Combustion- Part II: Low Octane Fuels,” SAE Paper, 2007-01-0206