Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 37, Issue 23, Pages 18486-18491Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2012.08.134
Keywords
Compression ratio; Spark timing; HCNG
Categories
Funding
- National Natural Science Foundation of China [51276095]
- Tsinghua University Initiative Scientific Research Program [20111081105]
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This paper investigates the effect of compression ratio and spark timing on the power performance and combustion characteristics of a hydrogen enriched compressed natural gas engine. The experimental data was conducted under variable compression ratios (i.e. 10:1, 11:1 and 12:1) by varying the spark ignition timing. The engine was kept running at a constant speed of 1200 rpm with a constant excess air ratio of 1.6 and a constant manifold absolute pressure of 50 kPa. It has been found from the results that the higher compression ratio, the higher the indicated thermal efficiency. Increase in compression ratio leads to higher brake torque and lower break specific fuel consumption. But the improvements are weakened between higher compression ratios. The peak pressure is higher with higher compression ratio. Faster heat release rates and lesser coefficient of variations of indicated mean effective pressure can also been observed at higher compression ratios. Copyright (c) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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