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Kamio, Junichi
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Effect of Mixture Stratification and Fuel Reactivity on Dual-Fuel Compression Ignition Combustion Process for SI-Based Engine

Honda R&D Co., Ltd.-Kohei Kuzuoka, Junichi Kamio, Kohtaro Hashimoto
Published 2016-10-17 by SAE International in United States
Compression ignition combustion with a lean mixture has high potential in terms of high theoretical thermal efficiency and low NOx emission characteristics due to low combustion temperatures. In particular, a Dual-Fuel concept is proposed to achieve high ignition timing controllability and an extended operation range. This concept controls ignition timing by adjusting the fraction of two fuels with different ignition characteristics. However, a rapid combustion process after initial ignition cannot be avoided due to the homogenous nature of the fuel mixture, because the combustion process depends entirely on the high reaction rate of thermal ignition.In this study, the effect of mixture stratification in the cylinder on the combustion process after ignition based on the Dual-Fuel concept was investigated. Port injection of one fuel creates the homogeneous mixture, while direct injection of the other fuel prepares a stratified mixture in the cylinder at the compression stroke. The difference in equivalence ratio of the stratified mixture and fuel properties of each specific fuel results in sequential ignition. Thus, the heat release rate is lower; in other words,…
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Study on HCCI-SI Combustion Using Fuels Ethanol Containing

Honda R&D Co., Ltd.-Junichi Kamio, Tadashi Kurotani, Kohei Kuzuoka, Yasuyuki Kubo, Hiroyoshi Taniguchi, Kohtaro Hashimoto
Published 2007-10-29 by SAE International in United States
Bio-ethanol is one of the candidates for automotive alternative fuels. For reduction of carbon dioxide emissions, it is important to investigate its optimum combustion procedure. This study has explored effect of ethanol fuels on HCCI-SI hybrid combustion using dual fuel injection (DFI). Steady and transient characteristics of the HCCI-SI hybrid combustion were evaluated using a single cylinder engine and a four-cylinder engine equipped with two port injectors and a direct injector. The experimental results indicated that DFI has the potential for optimizing ignition timing of HCCI combustion and for suppressing knock in SI combustion under fixed compression ratio. The HCCI-SI hybrid combustion using DFI achieved increasing efficiency compared to conventional SI combustion. Feed-forward and feed-back control systems based on DFI enabled the transient operation including acceleration and deceleration during HCCI combustion, re-ignition of HCCI combustion after fuel cut mode, HCCI-SI-HCCI combustion transition, and suppression of knock in SI combustion.
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A Study on Combustion Control by Dual-Fuel Strategies

Honda R&D Co., Ltd.-Junichi Kamio, Tadashi Kurotani, Takuya Sato, Yukihiko Kiyohiro, Kohtaro Hashimoto, Takahiro Gunji
  • Technical Paper
  • 2007-08-0242
Published 2007-05-23 by Society of Automotive Engineers of Japan in Japan
This work explores the potential of combustion control by dual-fuel strategies using combinations of gasoline, ethanol and diethyl-ether which are produced from ethanol. Steady state characteristics and transient operation of HCCI/SI combustion were evaluated using a single-cylinder engine and a four-cylinder engine equipped with two port injectors and a direct injector. The experimental results demonstrated that the strategies involve the potential for optimizing ignition timing of HCCI combustion and suppressing knock in SI combustion with fixed compression ratio. Feedforward and feedback control systems allowed the transient operation including HCCI-SI-HCCI combustion transition and re-ignition in HCCI combustion.
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Aeroacoustic Analysis of Transonic Helicopter Rotor Noise

National Aerospace Lab.-Shigeru Saito, Takashi Aoyama
The University of Tokyo-Keiji Kawachi, Junichi Kamio
Published 1994-03-01 by SAE International in United States
The viscous effect on the high-speed impulsive (HSI) noise for a helicopter rotor has been investigated by using a combined method of computational fluid dynamics (CFD) techniques with the extended Kirchhoff's equation. The pressure distributions around a rotor blade are obtained by Euler and Navier-Stokes equations to capture a precise shock behavior.The Kirchhoff's equation extended to a moving surface is applied to calculate the acoustic pressures at the observer point. In this calculation, the pressures and pressure gradients on the Kirchhoff surface, in which all the acoustic sources are enclosed, are obtained by using CFD techniques. In order to estimate the effect of the viscosity on the acoustic pressures, two types of turbulence model in Navier-Stokes calculations are used. One is Baldwin-Lomax model and the other is Coakley's q - ω model.The HSI noise of a non-lifting hovering rotor is calculated by using the present method, and the reasonable correlation between calculated and experimental results are obtained. The effect of the viscosity on the acoustic signature showed slight difference after the delocalization occurred on the…
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