Simulation Research on the Combustion Characteristics of Lean-Burn Natural Gas Engine under Different Ignition Timings and Ignition Energies

Paper #:
  • 2017-24-0064

Published:
  • 2017-09-04
Abstract:
The CFD model of 2135G natural gas engine was established, and working process from intake to combustion was simulated in this paper. Based on the validation of CFD model through experimental method, the combustion characteristic of natural gas engine was studied under different ignition timings and different spark energies. Results indicate that, the in-cylinder indicated mean effective pressure was increased with the ignition timing advancing from 22°CA BTDC to 32°CA BTDC in the same load. Meanwhile, the heat release rate was increased 23.18J/°CA and its phase was advanced 9°CA, the peak pressure was increased 45.95% and its phase was advanced 4.5°CA. On the other hand, when the spark energy decreases from 91.97mJ to 33.1mJ in the same load, the in-cylinder indicated mean effective pressure was decreased. Moreover, the heat release rate was decreased 15.18J/°CA and its phase was delayed 6.5°CA, the peak pressure was decreased 22.46% and its phase was delayed 4.5°CA. When the ignition timing was advanced from 22°CA BTDC to 32°CA BTDC and the spark energy was increased from 33.1mJ to 91.97mJ, the flame surface density was enlarged and the burning rate was accelerated at the same crank angle, meanwhile, higher combustion intensity was generated, so they are able to effectively shorten post-combustion, and advantageous to improve the economy and dynamic performance of natural gas engine. However, due to faster burning rate, the in-cylinder temperature was raised, which result in slightly increase of NO emission.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Attention: This item is not yet published. Pre-Order to be notified, via email, when it becomes available.
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Video
2017-02-03
Training / Education
2011-04-09
Standard
2015-08-10
Training / Education
2013-04-09
Training / Education
2013-04-09
Standard
1987-02-01
Training / Education
2013-04-09