A Study on Water Content in Lubricating Oil of Hydrogen-fueled Medium Duty Vehicle on Demonstration

Daisuke Hiyama･Itsuki Motomiya (Tokyo City University)･Ko Onodera (ENEOS)･Takuya Yamaura (Flatfield)･Koji Kikuhara (Waseda University)･Kaname Naganuma (Kanazawa Institute of Technology)･Akemi Ito (Tokyo City University)

A demonstration test was conducted using a heavy-duty vehicle equipped with a hydrogen engine to transport cargo from summer to winter. A sampling survey of the lubricating oil revealed that the amount of water in the oil increased during the winter season. This report describes the results of the study of the relationship between the amount of water in the oil, ambient temperature, oil temperature, and operating conditions, and so on.

A Study on Specifications of Piston Ring for Hydrogen Internal Combustion Engines based on Experimental Investigation and Numerical Calculation

Ryuichi Sasaki･Shinya Koike･Yuusuke Kuga･Keiichi Oshimi･Kazuya Mochizuki･Miyuki Usui (Riken / Riken NPR)･Akemi Ito (Tokyo City University)

In order to clarify influence of piston ring specifications for hydrogen concentration in blow by and oil transport to combustion chamber in hydrogen engine, We evaluate performance of piston ring with experiment results of in house port fuel injection hydrogen engine and numerical calculation results of in house simulation model. From these results, we investigated piston ring specifications suitable for hydrogen engine.

Combustion Characteristics of Blended CH₄-H₂ in Pre-Chamber Engines using Rapid-Compression Expansion Machine Experiments and 3D-CFD Kinetics Simulations

Yixin Feng･Kei Morita･Ryuta Nakao･Ratnak Sok･Jin Kusaka (Waseda University)

A lean burn mixture can improve the thermal efficiency of compressed natural gas. This work investigated the effect of engine wall temperature on the knock combustion of CH4-H2 co-generation systems. A Rapid Compression Expansion Machine (RCEM) was used to study the combustion characteristics of the blended fuel. 3D-CFD combustion simulations were performed using CONVERGE software. Combustion was compared for wall temperatures of 600K, 700K, 800K and 900K. The results showed that knock combustion occurred in all cases, and the knocking intensity increased and occurred earlier as the wall temperature increased.