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Effects of Gas Flow and Mixture Properties on Engine-Out HC Emissions
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English
Abstract
The geometry and area of the notch in the swirl control valve installed in the intake port were varied to analyze the effects on HC emissions. A swirl control valve functions to promote the formation of a homogeneous mixture, enabling the amount of liquid fuel supplied to the cylinder to be reduced. For this reason, it is difficult to obtain an added effect through the combined use of a swirl control valve and an auxiliary-air type of injector for assisting fuel atomization. Tumble (vertical swirl) flow fields are effective in shortening the combustion period. This results in a higher exhaust gas temperature at an equivalent level of combustion stability. It was thought that swirl flow fields produce residual gas flow in the cylinder after the completion of the main combustion period. It is surmised that the residual gas flow functions to diffuse and promote after-burning of the unburned HC layer. Accordingly, slanted swirl flow fields, having the characteristics and effects of both vertical and horizontal swirl, would be the most effective in reducing HC emissions.
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Authors
Citation
Tomita, M., Iwakiri, Y., Sakai, E., Urushihara, T. et al., "Effects of Gas Flow and Mixture Properties on Engine-Out HC Emissions," SAE Technical Paper 961952, 1996, https://doi.org/10.4271/961952.Also In
Emissions Formation and In-Cylinder Control of Emissions in SI Engines
Number: SP-1268; Published: 1996-10-01
Number: SP-1268; Published: 1996-10-01
Outcome of the European Programme on Emissions, Fuels and Engine Technologies (Epefe)
Number: SP-1204; Published: 1996-10-01
Number: SP-1204; Published: 1996-10-01
References
- Cheng, W.K. Hamrin D. Heywood, J.B. Hochgreb, S. Min, K.D. Norris, M. “An Over-view of Hydrocarbon Emissions Mechanisms in Spark-Ignition Engines,” SAE Paper 932708 1993
- Henein, N.A. Tagomori, M.K. Yassine, M.K. Asmus, T.W. Thomas, C.P. Hartman, P.G. “Cycle-by-Cycle Analysis of HC Emissions During Cold Start of Gasoline Engine,” SAE Paper 952402 1995
- Shin, Y. Cheng, W.K. Heywood, J.B. “Liquid Gasoline Behavior in the Engine Cylinder of SI Engine,” SAE Paper 941872 1994
- Sugimoto, T. Takeda, K. Yoshizaki, H. “Toyota Air-Mix Type Two-Hole Injector for 4-Valve Engines,” SAE Paper 912351 1991
- Yang, J. Kaiser, E.W. Siegl, W.O. Anderson, R.W. “Effects of Port-injection Timing and Fuel Droplet Size on Total and Speciated Exhaust Hydrocarbon Emissions,” SAE Paper 9307 11 1993
- Nogi, T. Yamaguchi J. Ohsuga, M. Kurihara, N. “Effects of Mixture Formation Technology on Gasoline Engine Performance,” SAE Paper 922092 1992
- Takeda K. Yaegashi T. Sekiguchi K. Saito K. Imatake N. “Mixture Preparation and HC Emissions of a 4-Valve Engine with Port Fuel Injection During Cold Starting and Warm-up” SAE Paper 950074 1995
- Nakayama Y. Maruya T. Kawamata M. Okiwa T. Nakajima K. Fujiwara M. “Reduction of Hydrocarbon Emissions from VTEC Engine During Cold-Starting Conditions,” SAE Paper 940481 1994
- Kuwahara, K. Kawai, T. Ando, H “Influence of Flow Field Structure after the Distortion of Tumble on Lean-Burn Flame Structure,” COMODIA 94 1994 89 94
- Kaiser, E.W. Siegl, W.O. Baidas, L.M. Lawson, G.P. Cramer, C.F. Dobbin, K.L. Roth, P.W. Smokovitz, M. “Time-Resolved Measurement of Speciated Hydrocarbon Emissions During Cold Start of a Spark-ignited Engine,” SAE Paper 940 963 1994
- Urushihara, T. Nakata, T. “Effect of Swirl and Tumble Motion on Fuel Vapor Behavior and Mixture Stratification in Lean Burn Engine,” The 12th Internal Combustion Engine Symposium 1995 Japan
- Kaneko, M. “Spatial Evaluation of In-Cylinder Turbulence Flow Using High-resolution PIV,” The 12th Internal Combustion Engine Symposium 1995 Japan
- Itoh, T. Kakuho, A. Hishinuma, H. Urushihara, T. Takagi, Y. Horie, K. Asano, M. Ogata, E. Yamashita, T. “Development of a New Compound Fuel and Fluorescent Tracer Combination for Use with Laser Induced Fluorescence,” SAE Paper 952465 1995
- Tabaczynski, R.J. Heywood, J.B. Kech, J.C. “Time-Resolved Measurements of Hydrocarbon Mass Flowrate in the Exhaust of a Spark-ignition Engine,” SAE Paper 720112 1972
- Iiyama, A. Urushihara, T. Murayama, T. “Establishment of an In-Cylinder Gas Motion Concept for Rapid and Stable Combustion in Lean-Burn Engines,” Nissan Technical Review 35 15 20 1994
- Urushihara, T. Murayama, T. Takagi, Y. Lee, K.H. “Turbulence and Cycle-by-Cycle Variation of Mean Velocity Generated by Swirl and Tumble Flow and Their Effects on Combustion,” SAE Paper 950813 1995
- Min, K. Cheng, W.K. “In-Cylinder Oxidation of Piston-Crevice Hydrocarbon in SI Engine,” COMODIA 94 125 130 1994