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Intake Design for Reduction of Duration of Combustion

Article of Honda R&D Technical Review Vol.27 No.2

Summary

Intake design has been conducted as part of research seeking to realize a level of thermal efficiency of 45% in gasoline engines in order to reduce the duration of combustion, which had been extended by EGR dilute combustion. First, the relationship between burning velocity (m/sec) and the square root (m/sec) of turbulent kinetic energy (m2/sec2) was studied, and it was determined that these parameters were effective in reducing the duration of combustion. Next, the fact that differences in turbulent kinetic energy occurred due to the direction of the flow passing the intake valve even in the case of flow motion with the same tumble ratio was focused on, and specifications were selected in order to make it possible to obtain a higher level of turbulent kinetic energy from intake ports displaying the same tumble ratio.
A prototype engine head was manufactured using the selected intake port specifications, and test results showed that the target of a main combustion duration of no more than 20 deg was realized under conditions of dilute combustion at an external EGR rate of 30%.

Reference

(1) International Energy Agency: Part4 Scenarios and Technology Roadmaps, Chapter13 Transport, Energy Technology Perspectives 2012, p. 443 (2012)
(2) Tagishi, R., Ikeya, K., Takazawa, M., Yamada, T.: Technology for Realization of Gasoline Engine Brake Thermal Efficiency of 45%, Honda R&D Technical Review, Vol. 27, No. 2, p. 1-11
(3) JP, 9-105330 (1997)
(4) JP, 2008-184930 (2008)
(5) U.S., Patent No. 6,385,530 (2002)
(6) Hayakawa, A., Miki, Y., Kubo, T., Nagano, Y., Kitagawa, T.: Variations of Turbulent Burning Velocity and Flame Front Shape of Spherically Propagating Premixed Turbulent Flame with Effective Turbulence Intensity, Journal of the Combustion Sociery of Japan, Vol. 55, No. 172, p. 202-209 (2013)
(7) Adomeit, P., Jakob, M., Pischinger, S., Brunn, A., Ewald, J.: Effect of Intake Port Design on the Flow Field Stability of a Gasoline DI Engine, SAE Technical Paper, 2011-01-1284 (2011)

Author (organization or company)

Taketo YAMADA(Automobile R&D Center)、Masayoshi TAKAHASHI(HRD Sakura)、Kenichiro IKEYA(Automobile R&D Center)、Noriyuki TAKEGATA(Automobile R&D Center)

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