TY - JOUR
T1 - Operable range extension of ammonia direct injection spark ignition engine by hydrogen addition
AU - Lee, Jeongwoo
AU - Jang, Yonghun
AU - Park, Cheolwoong
AU - Kim, Yongrae
AU - Choi, Young
N1 - Publisher Copyright:
© 2024 Hydrogen Energy Publications LLC
PY - 2024/3/8
Y1 - 2024/3/8
N2 - Ammonia is gaining attention as a non-carbon environmental-friendly fuel due to its superior storage capability compared to hydrogen. However, its high minimum ignition energy and slow laminar flame speed make it unsuitable for application in combustion-based energy conversion devices. In particular, when applied to internal combustion engines, issues such as combustion instability and limitations in operational range exist. Therefore, the intention is to address these issues by adding hydrogen, which has a wider flammable range and a faster laminar flame speed, to ammonia. In this study, the extension of the operable range of ammonia-fueled spark ignition engine by hydrogen addition was mainly discussed. Ammonia was injected directly in the cylinder and hydrogen was supplied into the intake port. The result showed that operable range of ammonia fueled combustion with hydrogen addition could be extended from 0.2 to 1.4 MPa with relatively stable combustion, i.e. CoV of gIMEP <5 %, except for one case. Moreover, under the BMEP 1 MPa load condition, hydrogen addition improved brake thermal efficiency (BTE) as 4.7 % and unburned ammonia also reduced by 25 %.
AB - Ammonia is gaining attention as a non-carbon environmental-friendly fuel due to its superior storage capability compared to hydrogen. However, its high minimum ignition energy and slow laminar flame speed make it unsuitable for application in combustion-based energy conversion devices. In particular, when applied to internal combustion engines, issues such as combustion instability and limitations in operational range exist. Therefore, the intention is to address these issues by adding hydrogen, which has a wider flammable range and a faster laminar flame speed, to ammonia. In this study, the extension of the operable range of ammonia-fueled spark ignition engine by hydrogen addition was mainly discussed. Ammonia was injected directly in the cylinder and hydrogen was supplied into the intake port. The result showed that operable range of ammonia fueled combustion with hydrogen addition could be extended from 0.2 to 1.4 MPa with relatively stable combustion, i.e. CoV of gIMEP <5 %, except for one case. Moreover, under the BMEP 1 MPa load condition, hydrogen addition improved brake thermal efficiency (BTE) as 4.7 % and unburned ammonia also reduced by 25 %.
KW - Ammonia
KW - Brake thermal efficiency
KW - Combustion stability
KW - Hydrogen
KW - Nitrogen oxides
KW - Operable range
UR - http://www.scopus.com/inward/record.url?scp=85184313353&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2024.01.276
DO - 10.1016/j.ijhydene.2024.01.276
M3 - Article
AN - SCOPUS:85184313353
SN - 0360-3199
VL - 58
SP - 1631
EP - 1639
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
ER -