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All Journal Automotive Experiences
Emir Yilmaz
Sophia University, Japan
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Mechanical Engineering

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Engine Performances of Lean Iso-Octane Mixtures in a Glow Plug Heated Sub-Chamber SI Engine Willyanto Anggono; Soen Peter Stanley; Ferdinand Ronaldo; Gabriel J. Gotama; Bin Guo; Emir Yilmaz; Mitsuhisa Ichiyanagi; Takashi Suzuki
Automotive Experiences Vol. 5 No. 1 (2022)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (666.785 KB) | DOI: 10.31603/ae.5118

Abstract

Due to the difficulty to directly study ammonia, the present work investigated the engine performance of lean iso-octane/air mixture to approximate ammonia combustion behaviour. The study was conducted using a single cylinder modified diesel engine that features a spark plug and glow plug in the sub-chamber. The investigations varied the engine speeds (1000 and 1500 RPM), glow plug voltages (6 and 10 volts), excess air ratios (1.4 to 1.8), and ignition timings (-2 to -5 °BTDC). The results suggested improved engine performances with a lower excess ratio and higher glow plug voltage due to more complete and stable combustion. By increasing the engine speed, the lean burn limit was extended and improved the engine performances. Because of the sub-chamber feature, delaying the ignition timing improved the engine performances. A larger excess air ratio was found to increase the sensitivity of the engine performances with the ignition timing. The brake mean effective pressure for all conditions has a coefficient of variation of less than 7%, indicating stable combustion. The results suggested that the current setup can be used to investigate ammonia blended fuel and direct ammonia combustion in future works.
Combustion Analysis of Ammonia/Gasoline Mixtures at Various Injection Timing Conditions in a High Compression Ratio SI Engine with Sub-Chamber Mitsuhisa Ichiyanagi; Emir Yilmaz; Takashi Suzuki; Takanobu Okada; Hikaru Yamamoto; Masashi Kodaka; Hikaru Shiraishi; Shinnosuke Mukae; Ryota Tamba; Henry Widjaja; Leon Jonathan; Sebastian Gunawan; Gabriel Jeremy Gotama; Willyanto Anggono
Automotive Experiences Vol. 7 No. 2 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.10533

Abstract

Due to the problem of carbon dioxide (CO2) emissions, alternative fuels such as ammonia (NH3) have garnered a lot of attention lately. This is due to its carbon-free molecular structure, ease of transport, and high energy density. Unfortunately, ammonia is not without flaws since it is considered a difficult fuel to burn in conventional internal combustion engines. To further investigate the burning characteristics of ammonia, this study is conducted for ammonia/gasoline co-combustion using a modified engine equipped with a sub-chamber. The engine ran at 1000 RPM and had a 17.7 compression ratio with two injection timings of -55 and 10 crank angle degrees (°CA) after the top dead center (ATDC), while the ammonia energy ratios were adjusted across a range from 40% to 70%. The results show that the earlier injection timing allowed better premixing between the air and fuel mixture, thus enhancing the overall combustion characteristics. For the later injection timing, the nitrogen oxide (NOx) emissions decrease at the higher ammonia energy ratio due to the denitrification of the nitrogen oxides (DeNOX) process. Overall, the earlier injection timing appears optimal for the 40% to 70% ammonia energy ratio under the present condition.
Co-Authors Bin Guo Ferdinand Ronaldo Gabriel J. Gotama Gabriel Jeremy Gotama Henry Widjaja Hikaru Shiraishi Hikaru Yamamoto Leon Jonathan Masashi Kodaka Mitsuhisa Ichiyanagi Ryota Tamba Sebastian Gunawan Shinnosuke Mukae Soen Peter Stanley Takanobu Okada Takashi Suzuki Willyanto Anggono Willyanto Anggono