A Study on the Combustion Characteristics of a Methanol-Diesel Dual-Fuel Engine

Kei Morita･Taiga Moriwaki (Waseda University)･Ryosuke Kogure･Takafumi Tanaka (Mitsubishi Heavy Industries Enine & Turbocharger)･Tomohiro Koga (Mitsubishi Heavy Industries)･Jin Kusaka (Waseda University)

The fundamental combustion characteristics of diesel methanol co-combustion were investigated over a wide range of conditions by the visualization experiments using a rapid compression and expansion machine. In addition, a reaction mechanism was selected based on the analysis of ignition delay and the laminar flame speed by detailed chemical kinetic calculation, and a highly accurate 3D-CFD model capable of predicting combustion under various parameter changes was developed. It was found that that excessively advanced or retarded diesel injection timing result in the deterioration of the diesel spray behavior and causes a significant ignition delay.

Effect of Biofuels on Soot emission Focusing on Hydrogen Content

Takafumi Kato･Kanta Kasugai･Ryosei Takeda･Ryoma Ohnishi･Kensei Kurita･Yoshiaki Nishijima (Aichi Institute of Technology)

In diesel engines, a higher hydrogen content in the fuel meaning a lower carbon content, which is expected to lead to soot formation reduction. Combustion tests were conducted using a single-cylinder engine. We measured that the amount of soot production against the hydrogen content in the fuel.

The effect of HVO ratio for ignition timing

Ryosei Takeda･Kanta Kasugai･Takafumi Kato･Ryoma Ohnishi･Kensei Kurita･Yoshiaki Nishijima (Aichi Institute of Technology)

Biofuels have attracted attention as a means of improving the exhaust performance of diesel engines. In particular, HVO (Hydrotreated Vegetable Oil) has a high hydrogen content due to hydrotreatment. This characteristic promotes the reaction between hydrogen in the fuel and oxygen in the air, resulting in an earlier ignition onset. In this study, we confirmed that HVO exhibits an earlier ignition timing than that of diesel fuel.

Evaluation of ignition and combustion characteristics of bio-blended fuel using a diesel engine equipped with a DPF

Minoru Tsuda･Masateru Ishida･Dai Yamanishi (National Fisheries University)･Yoriyuki Kambe (Was-inc)･Hidetsugu Sasaki (Tokyo University of Marine Science and Technology)

Since the ignition temperature of biodiesel fuel (BDF) is higher than that of diesel fuel, it is necessary to clarify its ignition and combustion characteristics. In this study, we clarified the ignition and combustion characteristics when using B5 (5% bio-blended fuel), B10, B20, and B30 as fuels in a 214kW/3101min-1 diesel engine equipped with a DPF in the exhaust system, and the effect of cerium-based fuel additives on reducing soot accumulated in the DPF (fuel efficiency improvement effect).

Effects of Fuel Physical Properties on Shape of Spray from a Diesel Nozzle

Kodai Aritomi･Keisuke Komada (Fukuoka Institute of Technology)･Shohei Yamamoto (Osaka Electro-Communication University)･Yasuyuki Takatsu (Fukuoka Institute of Technology)

The kinematic viscosity, surface tension, and density of the fuel were focused in this study, and test fuels were prepared in which only these physical properties differed. The test fuel, pressurized to 60 MPa, was injected into the atmosphere through a 10-hole injector with a nozzle diameter of 0.133 mm. The fuel spray was observed using a high-speed camera. The spray width was wider when the kinematic viscosity was low or the surface tension was low. The spray penetration was shorter when the density was high.