HYDROGEN-FUELED DIESEL-ENGINE WITHOUT TIMED IGNITION

被引:37
作者
HOMAN, HS
REYNOLDS, RK
DEBOER, PCT
MCLEAN, WJ
机构
[1] CORNELL UNIV,ITHACA,NY 14853
[2] CALTECH,JET PROP LAB,PASADENA,CA 91103
关键词
D O I
10.1016/0360-3199(79)90006-5
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Experiments were carried out to investigate the feasibility of converting a diesel engine to hydrogen-fueled operation without providing a timed ignition system. Use was made of a glow plug and a multiple-strike spark plug. The work was done with an ASTM-CFR engine, the diesel head of which was modified to resemble the geometry of a D399 series Caterpillar diesel engine. Engine speed was 1240 rev/min. The glow plug was found to provide reliable ignition and smooth engine operation. It caused the hydrogen to ignite almost immediately upon the start of injection. Indicated mean effective pressures were on the order of 1.3φ MPa for equivalence ratios φ between 0.1 and 0.4 at a compression ratio of 18. This is significantly higher than the corresponding result obtained with diesel oil (about 0.6 φ MPa for 0.3 < φ{symbol} < 0·9). Indicated thermal efficiencies were on the order of 0.4 for hydrogen and 0.20-0.25 for diesel oil. Operation with the multiple-strike spark system yielded similar values for IMEP and efficiency, but gave rise to large cycle-to-cycle variations in the delay between beginning of injection and ignition. Large ignition delays were associated with large amplitude pressure waves in the combustion chamber. The measured NOχ concentrations in the exhaust gas were of the order of 50-100 ppm. This is significantly higher than the corresponding results obtained with premixed hydrogen and air at low equivalence ratios. Compression ignition could not be achieved even at a compression ratio of 29. © 1979.
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页码:315 / 325
页数:11
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