【作者】

Luigi Tozzi

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC世界大会上发表，论文的版权归CIMAC所有。 Precombustion chamber (PCC) ignition is a common method for extending the lean limit and reducing combustion variability in large bore natural gas engines. However, most of the existing PCC designs operate under “rich” burn conditions, resulting in less than optimum combustion performance in terms of BTE/NOx trade-off. This paper will show how the use of advanced computational flow dynamic (CFD) is instrumental in controlling the local magnitude of the flow velocity and the air-fuel mixture distribution and in achieving a unique design of the PCC. This creates the capability to sustain efficient and stable combustion of lean mixtures within the PCC, hence, offering the potential for significantly improving the engine BTE, while maintaining NOx levels in the range required for meeting current and future mandates. Additionally, specific regions of the PCC, with repeatable and uniform flow velocity and lambda distributions, are identified as ideal locations for a combustion ionization probe. This presents an opportunity for a reliable and cost effective way to achieve dependable combustion feedback control and extend the range of optimum operations. A review of this Novel PCC technology is provided along with experimental data obtained from a fully instrumented Cooper-Bessemer GMV engine. Also, discussed are the potential benefits of this Novel PCC technology with respect to enabling major enhancements in combustion stability, ignitability, spark plug life, and engine efficiency necessary for achieving highly optimized solutions.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

5

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