Analysis of Hydrogen Jet Characteristics and Concentration Distribution by Simultaneous LIF and Schlieren Method Measurements in a Constant Volume Chamber

Hyun Jo･Masayasu Shimura･Taku Tsujimura (AIST)･Satoaki Ichi･Kyohei Izumi (Kawasaki Motors, Ltd.)･Hirotaka Kawatsu･Genki Shigeno (Honda Motor)･Narumi Hiramoto (Yamaha Motor)･Yoshinari Ninomiya (Suzuki Motor)

This study aims to understand the behavior and diffusion of hydrogen when a hydrogen jet is injected into a combustion chamber as a fuel. To achieve this, simultaneous measurements using Laser-Induced Fluorescence (LIF) and Schlieren methods were conducted in a constant volume chamber. The analysis examined how hydrogen distribution characteristics and internal concentration distribution vary under different injection and ambient pressure conditions, providing insights into behavior of hydrogen jet.

In-Cylinder Temperature Measurement of a Hydrogen Internal Combustion Engine Using Near-Infrared Two-Color Pyrometry

Fangsi Ren･Shinji Nakaya･Mitsuhiro Tsue (The University of Tokyo)･Hiroshi Kato･Kyohei Izumi･Satoaki Ichi (Kawasaki Motors, Ltd.)･Tomohiko Kamio (Yamaha Motor)･Kenichi Sano･Koichiro Matsushita (Honda Motor)･Yoshinari Ninomiya (Suzuki Motor)

Hydrogen is attracting attention as a promising alternative fuel for internal combustion engines aimed at achieving carbon neutrality. In this study, the in-cylinder flame temperature evolution of a hydrogen engine was evaluated using a two-color temperature measurement technique. The method employs a high-speed camera to simultaneously acquire near-infrared emissions from water vapor at two wavelengths below 1.1 μm, enabling a time-resolved temperature quantification.

Understanding In-Cylinder Phenomena Using Simultaneous Dual-Direction Imaging in a Direct-Injection Hydrogen Engine for Motorcycles

Kyohei Izumi･Hiroshi Kato･Yoshinori Nakao･Yusaku Matsumoto･Ryosuke Yokoyama (Kawasaki Motors, Ltd.)･Tomohiko Kamio (Yamaha Motor)･Yusuke Marui･Kenichi Sano (Honda Motor)･Yoshinari Ninomiya (Suzuki Motor Co., Ltd.)･Satoaki Ichi (Kawasaki Motors, Ltd.)

In the pursuit of carbon neutrality, the practical implementation of hydrogen engines necessitates a comprehensive understanding of in-cylinder phenomena, particularly with respect to fuel economy and emissions. This study employs a direct-injection hydrogen engine for motorcycles and utilizes simultaneous dual-direction optical access to capture in-cylinder processes, enabling detailed observation of combustion chamber phenomena across a wide spatial domain.

Understanding Abnormal Combustion Using Simultaneous Dual-Direction Imaging in a Direct-Injection Hydrogen Engine for Motorcycles

Hiroshi Kato･Kyohei Izumi･Ryosuke Yokoyama･Yusaku Matsumoto･Satoaki Ichi (Kawasaki Motors, Ltd.)･Tomohiko Kamio (Yamaha Motor)･Yoshinari Ninomiya (Suzuki Motor Co., Ltd.)･Kenichi Sano･Yusuke Marui (Honda Motor)･Yoshinori Nakao (Kawasaki Motors, Ltd.)

The suppression of abnormal combustion, including pre-ignition and knocking, is a major challenge in research aimed at the practical application of hydrogen engines for achieving carbon neutrality. As part of efforts to elucidate the mechanism of abnormal combustion in high-speed operation of motorcycle engines, this study attempted to identify the onset of abnormal combustion by simultaneously capturing a wide in-cylinder region from two viewing directions.

Analysis of Flame Propagation Behavior and Wall Heat Flux in Direct-Injection Hydrogen Motorcycle Engines

Yuki Kaga･Masakuni Oikawa･Yuji Mihara･Shoki Mashiko･Aoshi Yokomori (Tokyo City University)･Takumi Iwata (MOTORA,Inc.)･Hiroshi Kato･Kyohei Izumi (Kawasaki Motors,LTD.)･Kenichi Sano (Honda Motor)･Tomohiko Kamio (Yamaha Motor)

Multiple heat flux sensors were placed on the cylinder head of a motorcycle direct-injection hydrogen engine. The instantaneous heat flux results obtained were used to analyze flame propagation behavior. Furthermore, CFD analysis and in-cylinder visualization results under identical conditions were compared to understand the cylinder flame propagation behavior dependent on operating conditions, such as the excess air ratio.