This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Combustion Optimization in a Hydrogen-Enhanced Lean-Burn SI Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 11, 2005 by SAE International in United States
Annotation ability available
As part of ongoing research on hydrogen-enhanced lean burn SI engines, this paper details an experimental combustion system optimization program. Experiments focused on three key areas: the ignition system, in-cylinder charge motion produced by changes in the inlet ports, and uniformity of fuel-air mixture preparation. Hydrogen enhancement is obtained with a H2, CO, N2 mixture produced by a fuel reformer such as the plasmatron. The ignition system tests compared a standard inductive coil scheme against high-energy discharge systems. Charge motion experiments focused on the impact of different flow and turbulence patterns generated within the cylinder by restrictor plates at the intake port entrance, as well as novel inlet flow modification cones. The in-cylinder fluid motion generated by each configuration was characterized using swirl and tumble flow benches. Mixture preparation tests compared a standard single-hole pintle port fuel injector against a fine atomizing 12-hole injector.
Results indicate that optimizations of the combustion system in conjunction with hydrogen-enhancement can extend the relative air/fuel ratio λ at the lean limit of operation by roughly 25% compared against the baseline configuration. Nearly half of this improvement may be attributed to improvements in the combustion system. Furthermore, hydrogen-enhancement produces a nearly constant lean misfire limit improvement of ∼ 0.20 - 0.25 λ values, regardless of baseline combustion behavior. In contrast, the improvement of the amount of dilution with excess air at the point of peak engine efficiency decreases as engine operation becomes leaner, due to the inherently lengthening burn duration as λ increses.
CitationGoldwitz, J. and Heywood, J., "Combustion Optimization in a Hydrogen-Enhanced Lean-Burn SI Engine," SAE Technical Paper 2005-01-0251, 2005, https://doi.org/10.4271/2005-01-0251.
SI Combustion and Direct Injection SI Engine Technology
Number: SP-1972; Published: 2005-04-11
Number: SP-1972; Published: 2005-04-11
- Goldwitz, J.A. “Combustion Optimization in a Hydrogen-Enhanced Lean Burn SI Engine,” MIT Department of Mechanical Engineering 2004
- Heywood, J.B. Internal Combustion Engine Fundamentals McGraw-Hill, Inc. New York 1988
- Tully, E.J. Heywood, J.B. “Lean-Burn Characteristics of a Gasoline Engine Enriched with Hydrogen From a Plasmatron Fuel Reformer,” SAE 2003-01-0630
- Kido, H. Huang, S. Tanoue, K. Nitta, T. “Improvement of Lean Hydrocarbon Mixtures Combustion Performance by Hydrocarbon Addition and Its Mechanisms,” International Symposium, COMODIA 94 Yokohama, Japan 1994
- Tully, E.J. “Lean-Burn Characteristics of a Gasoline Engine Enriched with Hydrogen from a Plasmatron Fuel Reformer,” MIT Department of Mechanical Engineering 2002
- Geiger, J. Pischinger, S. Böwing, R. Koß, H.-J. Thiemann, J. “Ignition Systems for Highly Diluted Mixtures in SI-Engines,” SAE 1999-01-0799
- Lee, Y.G. Grimes, D.A. Boehler, T.A. Sparrow, J. Flavin, C. “A Study of the Effects of Spark Plug Electrode Design on 4-Cycle Spark-Ignition Engine Performance,” SAE 2000-01-1210
- Pischinger, S. Heywood, J.B. “How Heat Losses to the Spark Plug Electrodes Affect Flame Kernel Development in an SI-Engine,” SAE 900021
- Rivin, B. Dulger, M. Sher, E. “Extending Lean Misfire Limit of Methane-Air Mixtures by Means of an Enhanced Spark Discharge,” SAE 1999-01-0573
- Shen, H. Hinze, P.C. Heywood, J.B. “A Study of Cycle-to-Cycle Variations in SI Engines Using a Modified Quasi-Dimensional Model,” SAE 961187
- Heywood, J.B. “Combustion and its Modeling in Spark-Ignition Engines,” International Symposium, COMODIA 94 Yokohama, Japan 1994
- Pajot, O. Mounaϊm-Rouselle, C. Queiros-Conde, D. “New Data on Flame Behaviour in Lean Burn S.I. Engine,” SAE 2001-01-1956
- Fekete, N. et al. “Advanced Engine Control and Exhaust Gas Aftertreatment of a Leanburn SI Engine,” SAE 972873
- Endres, H. Neußer, H.-J. Wurms, R. “Influence of Swirl and Tumble on Economy and Emissions of Multi Valve SI Engines,” SAE 920516
- Stein, R.A. Chou, T. Lyjak, J.C. “The Combustion System of the Ford 5.4L 3-Valve Engine,” Powertrain Conference Dearborn, MI September 2003
- Matsuki, M. et al. “Development of a Lean Burn Engine with a Variable Valve Timing Mechanism,” SAE 960583
- Kobayashi, K. et al. “Effect of Fuel Atomization on the Lean-Burn Characteristics Under Steady Condition in a Spark-Ignition Engine,” SAE 960460
- Pischinger, S. Heywood, J.B. “A Model for Flame Kernel Development in a Spark-Ignition Engine,” 23 rd Symposium (International) on Combustion The Combustion Institute 1033 1040 1990
- Topinka, J.A. Gerty, M.D. Heywood, J.B. Keck, J.C. “Knock Behavior of a Lean-Burn, H 2 and CO-Enhanced, SI Gasoline Engine Concept,” SAE 2004-01-0975