Investigation of Optimal Combustion Concept for Oxymethylene Dimethyl Ether (OME)

Kazuya Miyashita･Shinya Furukawa･Hisashi Ozawa (Isuzu Advanced Engineering Center)

Oxymethylene dimethyl ether (OME) exhibits distinct fuel characteristics compared to conventional diesel, including significantly reduced soot emissions and late combustion, but it also has a lower heating value and tends to increase heat losses. Consequently, it is necessary to investigate combustion systems specifically optimized for OME. This paper presents a novel OME combustion concept combining a large nozzle diameter, low injection pressure, and a high compression ratio. The performance of this concept was evaluated through experimental investigations on a single-cylinder engine, complemented by in-cylinder combustion visualization.

In-cylinder combustion characteristic and thermal efficiency analysis of a 3L-compression ignition engine using B7G10E10 fuel

Preechar KARIN･Chaynit Renumarn･Poonnut Thaeviriyakul･Watanyoo Phairote･Mek Srilomsak･Chinda Charoenphonphanich (KMITL)

This study investigated the effects of blending weight ratio of 5% and 10% ethanol and gasoline with standard B7-diesel on the combustion characteristics of a light-duty common-rail diesel engine. The engine was tested on a dynamometer across various low loads to analyze in-cylinder pressure and thermal efficiencies. The analysis revealed a critical trade-off associated with the gasoline-ethanol blends: while the oxygenated fuel of gasoline-ethanol significantly improved the indicated thermal efficiency through enhanced combustion, its lower viscosity simultaneously led to increased frictional losses. Consequently, these competing effects resulted in an improvement in brake thermal efficiency compared to the baseline B7-diesel.

Effects of Hydrogen Substitution Ratio on the Performance and Emission Characteristics of a Hydrogen–Diesel Dual-Fuel Engine

Teofan Kishi･Motoki Nishizawa･Satoshi Nakatani･Apichai Tripatara･Naoto Horibe･Hiroshi Kawanabe (Kyoto University)

In this study, an experimental investigation was conducted using a single-cylinder engine to examine hydrogen–diesel dual-fuel combustion. Under steady-state, constant-speed operation, the total input heat was maintained constant while the diesel injection timing and the hydrogen substitution ratio (0–90%) were varied. The effects of these parameters on engine performance and exhaust characteristics, including soot particle size distribution, were evaluated.

Application of Next-Generation Biodiesel Fuel HVO to an Inline 6-Cylinder 3.3L Diesel Engine

Yusuke Nishioka･Takeru Matsuo･Tomoyuki Kanda･Daisuke Fukuda･Jun Kanzaki･Makoto Namba･Sangkyu Kim･Daisuke Shimo (Mazda)

Mazda proposes a strategy that offers not only battery electric vehicles but also highly efficient internal combustion engine vehicles combined with carbon-neutral fuel during transition to renewable generation toward carbon neutral by 2050. This paper introduces the combustion concept that enables HVO, which is widely used in Europe, to the 3.3L diesel engine as drop-in fuel and the performance and reliability verification results.