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Combustion Characteristics of Methane Direct Injection Engine Under Various Injection Timings and Injection Pressures

Title
Combustion Characteristics of Methane Direct Injection Engine Under Various Injection Timings and Injection Pressures
Author
박성욱
Keywords
SPARK-IGNITION ENGINE; NATURAL-GAS ENGINE; FUEL-INJECTION; ALTERNATIVE FUEL; GASOLINE; CNG; EMISSIONS; HYDROGEN; PERFORMANCE; SPRAY
Issue Date
2017-08
Publisher
ASME
Citation
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME, v. 139, no. 8, Article no. 082802
Abstract
The performance of a methane direct injection engine was investigated under various fuel injection timings and injection pressures. A single-cylinder optical engine was used to acquire in-cylinder pressure data and flame images. An outward-opening injector was installed at the center of the cylinder head. Experimental results showed that the combustion characteristics were strongly influenced by the end of injection (EOI) timing rather than the start of injection (SOI) timing. Late injection enhanced the combustion speed because the short duration between the end of injection and the spark-induced strong turbulence. The flame propagation speeds under various injection timings were directly compared using crank-angle-resolved sequential flame images. The injection pressure was not an important factor in the combustion; the three injection pressure cases of 0.5, 0.8, and 1.1 MPa yielded similar combustion trends. In the cases of late injection, the injection timings of which were near the intake valve closing (IVC) timing, the volumetric efficiency was higher (by 4%) than in the earlier injection cases. This result implies that the methane direct injection engine can achieve higher torque by means of the late injection strategy.
URI
http://gasturbinespower.asmedigitalcollection.asme.org/article.aspx?articleid=2599261http://repository.hanyang.ac.kr/handle/20.500.11754/115285
ISSN
0742-4795; 1528-8919
DOI
10.1115/1.4035817
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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