Effect of different excess air ratio values and spark advance timing on combustion and emission characteristics of hydrogen-fueled spark ignition engine |
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| Affiliation: | 1. Engine Research Department, Environmental System Research Division, Korea Institute of Machinery and Materials, Daejeon, 34103, Republic of Korea;2. School of Mechanical Engineering, Soongsil University, Seoul, 06978, Republic of Korea;3. Engine Components Research Team, Korea Aerospace Research Institute, Daejeon, 34133, Republic of Korea;1. Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA;2. Department of Mechanical Engineering, Tobruk University, Tobruk, Libya |
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| Abstract: | This study investigated the effect of varying the spark advance timing and excess air ratio (air excessive ratio; λ) on the combustion and emission of nitrogen oxide (NOx) in a hydrogen-fueled spark ignition engine under part load conditions. The engine test speed was fixed at 2,000 rpm and the torque condition was 60 Nm. Excess air ratio was varied from the stoichiometric (λ = 1) to the lean mixture condition (λ = 2.2) by throttling. The spark advance timing was controlled to determine the maximum brake torque timing (MBT) for each excess air ratio value. Subsequent to the determination of the spark advance timing for MBT, the spark timing was varied from MBT timing to top dead center. Based on the results, it is concluded that the leanest mixture condition (λ = 2.2) with MBT spark timing exhibited the highest brake thermal efficiency of 34.17% and the NOx emissions were as low as 14 ppm. |
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| Keywords: | Air excessive ratio (excess air ratio) Back-fire Hydrogen-fueled Lean mixture condition Spark advance timing Spark ignition engine |
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