Time-series spectrum analysis of spark discharge and flame in hydrogen spark ignition engine

Kotaro Shimizu･Nobuyuki Kawahara･Yoshimitsu Kobashi (Okayama University)･Satoaki Ichi (Kawasaki Motors, Ltd.)･Koichiro Matsushita (Honda Motor)･Tomohiko Kamio (Yamaha Motor)･Yoshinari Ninomiya･Makoto Kaneko (Suzuki Motor Corporation.)

The objective of this study was to investigate changes in the plasma state during the process from spark discharge to combustion in a hydrogen spark ignition engine. In a compression-expansion engine using hydrogen as fuel, we simultaneously employed a fiber optic spark plug and a Cassegrain optics to obtain the time-series emission spectra from spark discharge to combustion. We detected emissions of OH and N2 and confirmed changes in the plasma state.

Study of flame propagation and quenching characteristics of premixed turbulent flames with Karlovitz number

DAI MATSUDA･Hiroshi MAEYAMA･Ekenechukwu Chijioke Okafor･Toshiaki Kitagawa (Kyushu univ.)

The purpose of this study is to control premixed turbulent combustion in spark-ignition engines. The flame propagation and quenching characteristics of premixed turbulent flames for various fuels (pentene, ethanol, and isooctane) were summarized using turbulence intensity and laminar burning velocity. In addition to the ratio of laminar burning velocity and turbulent intensity, the Karlovitz number was used to explain the quenching process.

Evaluation of reaction and mixing characteristics of near-wall gases based on micro gas sampling and numerical analysis in spark ignition engine

Yuji Tagaya･Tsuyoshi Nagasawa･Hidenori Kosaka (Institute of Science Tokyo)

To elucidate the flame quenching mechanism in spark ignition engines, this study applied a micro gas sampling system to a premixed propylene/air combustion field formed inside a Rapid Compression Machine (RCM) and conducted near-wall micro gas sampling. Based on the measured near-wall gas composition measurement values and numerical simulations, the reaction mechanisms and mixing characteristics of near-wall unburned and burned gases were investigated.

A Study on Ion Current of Carbon-free Fuel Reciprocating Engine

Kouichi Muneo･Mitsuhiro Izumi･Tsutomu Kusuhara･Hiroyuki Kimura･Akihiro Yamao･Kou Wada (Diamond & Zebra Electric)

Hydrogen and ammonia are attracting attention as carbon-free fuel and expected putting into practical use. However, these unique combustion characteristics complicated stable combustion. As combustion detection technology for addressing the issue, ion current detection is exemplified. In this study, ion current of hydrogen and ammonia combustion is evaluated the possibility of combustion control.

Study on Ignition and Combustion Characteristics for Ammonia-Fueled Spark Ignition Engine

Ryota Yamada･Shunsuke Kasuga･Hiroyuki Sakai･Takeshi Hashizume (Toyota Motor)

Ammonia is attracting attention as a next-generation fuel for internal combustion engines toward carbon neutrality. However, its low combustion rate and other characteristics make its combustion range narrow. Expansion of combustion range is required for its application to spark ignition engines. In this study, physical indices showing the ignition and combustion characteristics of ammonia were developed by combustion analysis and CFD of a single-cylinder engine, and directions for expanding the combustion range were obtained.

Laminar Premixed Combustion Characteristics of Ternary Fuel Mixtures of Methane, Hydrogen, and Carbon Dioxide

Wataru Nishio･Takuma Kobayashi･Taketoshi Shimizu (Waseda University)･Kei Yoshimura･Satoru Tokuhara (Suzuki Motor)･Jin Kusaka (Waseda University)

From a carbon-neutral (CN) perspective, compressed natural gas (CNG) and hydrogen compressed natural gas (HCNG), which mixes green hydrogen with CNG, are attracting attention. In order to put these fuels into practical use in society, it is necessary to understand their combustion characteristics. In this study, we clarified the effect of fuel composition on laminar combustion characteristics by visualizing combustion using a constant volume chamber.