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Watanabe, Yusuke
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A Study of a Lean Homogeneous Combustion Engine System with a Fuel Reformer Cylinder

Hokkaido University-Shuntaro Ishiguro, Gen Shibata, Hideyuki Ogawa, Yoshimitsu Kobashi, Yusuke Watanabe
YANMAR Co., Ltd.-Go Asai, Yuki Tokuoka, Thomas Bayer
  • Technical Paper
  • 2019-01-2177
Published 2019-12-19 by SAE International in United States
The Dual-Fuel (DF) combustion is a promising technology for efficient, low NOx and low exhaust particulate matter (PM) engine operation. To achieve equivalent performance to a DF engine with only the use of conventional liquid fuel, this study proposes the implementation of an on-board fuel reformation process by piston compression. For concept verification, DF combustion tests with representative reformed gas components were conducted. Based on the results, the controllability of the reformed gas composition by variations in the operating conditions of the reformer cylinder were discussed.
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Chemical Reaction Processes of Fuel Reformation by Diesel Engine Piston Compression of Rich Homogeneous Air-Fuel Mixture

SAE International Journal of Engines

Hokkaido University-Yusuke Watanabe, Shuntaro Ishiguro, Gen Shibata, Hideyuki Ogawa, Yoshimitsu Kobashi
YANMAR Co., Ltd.-Go Asai
  • Journal Article
  • 2017-32-0120
Published 2017-11-15 by Society of Automotive Engineers of Japan in Japan
To extend the operational range of premixed diesel combustion, fuel reformation by piston induced compression of rich homogeneous air-fuel mixtures was conducted in this study. Reformed gas compositions and chemical processes were first simulated with the chemistry dynamics simulation, CHEMKIN Pro, by changing the intake oxygen content, intake air temperature, and compression ratio. A single cylinder diesel engine was utilized to verify the simulation results. With the simulation and experiments, the characteristics of the reformed gas with respect to the reformer cylinder operating condition were obtained. Further, the thermal decomposition and partial oxidation reaction mechanisms of the fuel in extremely low oxygen concentrations were obtained with the characteristics of the gas production at the various reaction temperatures.The main reformed products were hydrogen (H2), carbon monoxide (CO), carbon dioxide (CO2), methane (CH4), and ethylene (C2H4) and the results indicated that the reforming depends on the maximum temperature in the cylinder, however, the amount of reformed gas is lower than the values predicted by the CHEMKIN simulation.
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Evaluation of Homogeneous Charge Compression Ignition at High Engine Speeds using a Super Rapid Compression Machine

Nihon University-Yusuke Watanabe, Takuo Kuwahara, Mitsuaki Tanabe
SUBARU Engineering Division PGM, Fuji Heavy Industries-Koji Morikawa
Published 2008-10-06 by SAE International in United States
We had improved RCM and developed a Super Rapid Compression Machine (SRCM) that realizes an extremely rapid compression compared with the conventional RCM. In this study, the performance of the developed SRCM was evaluated. The SRCM was used to investigate on the effects of equivalence ratio on HCCI of n-heptane and iso-octane fuel/air mixture. Experimental results for ignition delay time, τ, and combustion time, t, were obtained from the cylinder pressure histories. The HCCI at high engine speeds was clarified by Optical observation using a high speed camera. As a result, the ignition delay time and combustion time are found to saturate above equivalence ratio of 0.6 at constant compression ratio. In the HCCI combustion in high compression ratio case, shock wave occurs from the core region of the roll-up vortex cause by piston motion. The HCCI combustion has many peaks over a wide range of frequency.
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Analysis of Performance in the Refrigeration Cycle With Capillary Coil

Sophia Univ.-Yusuke Watanabe, Takashi Suzuki
  • Technical Paper
  • 2007-08-0479
Published 2007-10-01 by Society of Automotive Engineers of Japan in Japan
Refrigeration ability of the system which used thermostatic expansion valve was compared with the system which used capillary coil for the expansion device. Influence of capillary coil to refrigeration cycle was examined. As a result, it became clear that coefficient of performance (COP) was improved by the improvement of refrigeration ability by increase of refrigerant flow quantity and the energy of the high pressure side was regenerated to the low pressure side.
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New Tensile Strength Measurement Method for Individual Flip Chip Bump

Denso Corp.-Yusuke Watanabe, Takao Yoneyama, Osamu Takenaka
  • Technical Paper
  • 978074
Published 1997-05-21 by Society of Automotive Engineers of Japan in Japan
Bump bonding is a technique for making the interconnection between Flip Chip devices and their substrates. The conventional measurement method of bump strength determines the total strength of array of bonded bumps by pulling the Flip Chip away from the substrate. However, this method has several limitations. These limitations were overcome by the development of a tensile test machine capable of measuring singular bump. It was found that this developed test method was possible to measure accurately the tensile strength of individual fracture mode comparing with the conventional test method.