Visualization of the Combustion in W(a)rtsil(a) 34SG Pre-chamber ignited Lean Burn Gas Engine
An experimental study is carried out to investigate the combustion process in a W(a)rtsil(a) 34SG spark ignited lean burn four-stroke large bore engine (cylinder bore of 340 mm and stroke of 400 mm) by the means of passive optical diagnostics when operating by natural gas. The main focus of this work is to gain qualitative and quantitative knowledge about the in-cylinder combustion phenomena when igniting a lean air/fuel mixture , i.e. lambda about 2, with pre-chamber induced igniting jets The work consists of two-dimensional imaging of the combustion process in single cylinder research engine with optical access to the combustion chamber under relevant operating condition. To gain further knowledge of the ignition and combustion process in the SG optical engine, high speed imaging (20 kHz) of the flame chemiluminescence was performed. The high speed image sequences captured the full duration of the ignition and flame propagation processes in a single cycle. The topology of the flame is studied during the whole combustion duration in order to understand how the velocities of the jet are affecting the flame propagation. The analysis is based on pre-combustion chamber and main chamber apparent heat release rates from the pressure measurements and from the recorded flame images. The results showed that the pressure difference between the pre-combustion chamber and main combustion chamber is due to the pre-combustion chamber apparent heat release rate. The combustion of the main chamber takes place after about 95 % heat is realised from the pre-combustion chamber. Based on the cycle-tocycle variations, the flame propagation from the precombustion chamber to the main combustion chamber is faster due to a lower pre-combustion chamber apparent heat release rate.
Jeudi Duong Jari Hyvonen Rikard Wellander Oivind Andersson Mattias Richter
W(a)rtsil(a),Finland Lund University,Sweden
国际会议
上海
英文
1-12
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）