Effect of Supercharging on Ammonia/Gasoline Co-combustion Characteristics in a High Compression Ratio Engine with Sub-chamber

Takanobu Okada･Hikaru Yamamoto･Hikaru Shiraishi･Emir Yilmaz･Mitsuhisa Ichiyanagi･Takashi Suzuki (Sophia University)

Ammonia has gained attention as a carbon-free fuel. With its high energy density and good transportability, ammonia is expected to be used as an engine fuel. However, ammonia faces challenges such as high auto-ignition temperature and slow combustion. To identify stability combustion factors, this study examined the limits of ammonia content in the fuel and the effect of supercharging. Using gasoline as supplementary fuel and varying the ammonia ratio, stable operation was achieved with ammonia energy share of 77%, in addition supercharging improved maximum in-cylinder pressure and performance.

Evaluation of Combustion Performance of Emulsion Fuel using Time-series Analysis of Cylinder Pressure

Keisuke Yagi･Iman Kasih Telaumbanua･Yoshihiko Oishi･Hideki Kawai (Muroran Institute of Technology)･Himsar Ambarita (Universitas Sumatera Utara)

In emulsion fuel, which is one of the candidates to achieve carbon neutral, increasing water content causes uneven burning. The purpose of this study is to evaluate the combustion performance of emulsion fuel containing different water content by analyzing the time series cylinder pressure data using FFT. The spectrum obtained from the analysis can show instantaneous changes in cylinder pressure during emulsion and can be a criterion for judging normal or abnormal combustion.

A Study on Combustion Characteristics of Ammonia-diesel Dual Fuel Engine

Yuma Hozen (Waseda University)･Ryosuke Kogure･Takafumi Tanaka (Mitsubishi Heavy Industries Engine & Turbocharger)･Tomohiro Koga (Mitsubishi Heavy Industries)･Toma Erikawa･Jin Kusaka (Waseda University)

To investigate the combustion characteristics of ammonia mixed diesel fuel, visualization experiments were conducted using a rapid compression and expansion system. A model of the reaction and combustion was constructed, and the effects of changes in operating conditions were investigated. The results showed that ammonia co-firing increases N2O, but reduces greenhouse gas emissions by about 40% at a co-firing rate of 60%.

Study on Compliance with Fuel Standards for FT Synthetic Gasoline and FT Synthetic Diesel Oil

Kenichi Okamoto･Noriaki Ohmori･Hiroshi Kisai･Mitsunori Tabata (Japan Petroleum and Carbon Neutral Fuels Energy Center)･Takeru Ohtsuka･Natsuki Hamada･Kazuhito Sato (Cosmo Oil)

We confirmed the Alignment of prototype FT gasoline and prototype FT diesel oil with fuel standards, which were produced by appropriate post-processing of FT crude oil, and grasped the characteristics of their fuel quality. Additionally, we verified the removal effect of by-products such as oxygen-containing compounds through post-processing. Furthermore, we understood the characteristics of energy efficiency and liquid fuel yield during the post-processing of FT crude oil.

The Impact on Rubber Components of Oxygenated Synthetic Fuels and Prototype FT Synthetic Fuels

Noriaki Ohmori･Kenichi Okamoto･Hiroshi Kisai･Mitsunori Tabata (Japan Petroleum and Carbon Neutral Fuels Energy Center)･Takeru Ohtsuka (Cosmo Oil)

In the world, research and development on synthetic fuels towards carbon neutrality is being conducted.
Therefore, we evaluated the impact of the prototype FT synthetic gasoline and FT synthetic diesel fuel, as well as oxygen-containing synthetic fuels, on rubber materials. The results are shown below:
The prototype FT synthetic gasoline and FT synthetic diesel fuel had minimal impact at the evaluated blending ratios.
We confirmed that oxygen-containing synthetic fuels may have an impact on rubber materials even at low blending ratios.
Based on these, we organized considerations for use in automobiles.