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A Critique of the Theory for Gussac's “LAG Process” Engine
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English
Abstract
The theory of the LAG process (1)* is examined, especially the claim that radicals resulting from rich combustion in the pre-chamber reduce the induction time in the main chamber resulting in more rapid combustion. Recent calculations are presented which show that flame propagation is dominated by diffusion of radicals which eliminates any induction time. Additional radicals from the pre-chamber would be superflous. Assuming more rapid combustion in an actual engine, as Gussac claims, tentative alternate explanations are given. The Appendix reviews and extends Semenov's theory (2) of branching chain reactions. It is shown that buildup of radical concentrations governs the induction period, and that the rate of fuel consumption is determined by the steady state radical concentration.
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Citation
Creighton, J., "A Critique of the Theory for Gussac's “LAG Process” Engine," SAE Technical Paper 790249, 1979, https://doi.org/10.4271/790249.Also In
References
- Gussac L. A. “High Chemical Activity of Incomplete Combustion Products and a Method of Prechamber Torch Ignition for Avalanche Activation of Combustion in Internal Combustion Engines,” SAE Paper 750890 1975
- Semenov N. N. “On Types of Kinetic Curves in Chain Reactions” “I. Laws of the Autocatalytic Type” 1944 “II. Consideration of the Interaction of Active Particles” 62 1944
- Creighton John R. Lund Carl M. “Modeling Study of Flame Structure in Low-Pressure, Laminar, Pre-Mixed Methane Flames,” 10th Materials Research Symposium, U. S. National Bureau of Standards Gaithersburg, Md. Sept. 1978 Univ. of Calif.
- Tsuboi T. Wagner H. Gg. “Homogeneous Thermal Oxidation of Methane in Refelcted Shcok Waves,” Fifteenth Symposium (international) on Combustion The Combustion Institute Pittsburgh, PA 883 1974
- Westbrook C. K. Creighton J. Lund C. Dryer F. L. “A Numerical Model of Chemical Kinetics of Combustion in a Turbulent Flow Reactor” J. Phys. Chem. 81 2542 1977