Reduction of Cyclic Variations by Using Advanced Ignition Systems in a Lean-Burn Stationary Natural Gas Engine Operating at 10 Bar BMEP and 1800 rpm [electronic resource]

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 629.22 Types of vehicles

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2018

Mô tả vật lý: Size: 12 p. : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 266394

In stationary natural gas engines, lean-burn combustion offers higher engine efficiencies with simultaneous compliance with emission regulations. A prominent problem that one encounters with lean operation is cyclic variations. Advanced ignition systems offer a potential solution as they suppress cylic variations in addition to extending the lean ignition limit. In this paper, the performance of three ignition systems ? conventional spark ignition (SI), single point laser ignition (LI) and pre-chamber equipped laser ignition (PCLI) - in a single-cylinder natural gas engine is presented. First, a thorough discussion regarding the efficacy of several metrics, in addition to COV_IMEP, in representing combustion instability is presented. This is followed by a discussion about the performance of the three ignition systems at a single operational condition, i.e., same excess-air ratio (?) and ignition timing (IT). Next, these metrics are compared at the most optimal operational points for each ignition system, i.e., at points where ? and IT are optimized to achieve highest efficiency. From these observations, it is noted that PCLI achieves highest increase in engine efficiency, ?? = 2.1% points, and outperforms the other two methods of ignition. In conclusion, a closer look reveals that the variation in Ignition Delay (COV_ID) was negligible, whereas that in combustion duration (COV_CD) was significantly lower by 2.2% points. However, the metrics COV_ID and COV_CD are not well correlated with COV_IMEP.
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