Extreme lean hydrogen combustion in SI engines: NOx emissions and exergy destruction analysis
International Journal of Exergy, cilt.50, sa.4, ss.278-289, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 50 Sayı: 4
- Basım Tarihi: 2026
- Doi Numarası: 10.1504/ijex.2026.155922
- Dergi Adı: International Journal of Exergy
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
- Sayfa Sayıları: ss.278-289
- Anahtar Kelimeler: cold combustion, exergy, extreme lean combustion, hydrogen
- Yıldız Teknik Üniversitesi Adresli: Evet
Özet
This study examines the effects of excess air coefficient (λ) and late ignition timing on NOx emissions and exergy destruction in a hydrogen-fuelled internal combustion engine converted from a conventional diesel engine. Experiments are conducted at 1,500 rpm and 3.5 kW using two ignition timings [10° and 0° before top dead centre (BTDC)] and three excess air coefficients (λ = 1.05, 2.15, and 3.75). Results indicate that late ignition (0° BTDC) and ultra-lean operation (λ = 3.75) significantly reduce NOx emissions. The impacts on brake thermal efficiency (BTE), brake specific energy consumption (BSEC), and exergy destruction are also evaluated.