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首页> 外文会议>ASME Internal Combustion Engine Division fall technical conference 2012 >JET-PENETRATION IN PRECHAMBER-IGNITED LEAN LARGE-BORE NATURAL GAS ENGINES
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JET-PENETRATION IN PRECHAMBER-IGNITED LEAN LARGE-BORE NATURAL GAS ENGINES

机译：预先燃烧的稀薄大口径天然气发动机中的射流穿透

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摘要

Combustion in lean large-bore natural gas engines is usually initiated by gas-scavenged prechambers. The hot reacting products of the combustion in the prechamber penetrate the main chamber as reacting jets, providing high ignition energy for the lean main chamber charge. The shape and intensity of the reaction zone in these jets are the key elements for efficient ignition and heat release in the main chamber. The influence of geometrical and operational parameters on the reaction during jet penetration was investigated in detail. As the periodically chargeable high pressure combustion cell used in the study provides full optical access to the entire main chamber the evolution of the spatial distribution of the reaction zones was investigated in terms of OH*-chemiluminescence. As jet penetration is a very fast and highly transient process the emission of OH* was recorded at a frequency of f = 30000 Hz. The macroscopic reaction zone parameters in the jet region (penetration length and angle, reacting area and light emission) reveal the influence of orifice size and prechamber gas injection on the heat release in the shear layer between the jet and the lean charge in the main chamber. In addition, the influence of the development of the reaction in these zones on the ignition probability and the main chamber pressure rise is shown. With an appropriate selection of the combination of the prechamber orifice geometry and the operating parameters significant improvements of ignition probability and heat release in the main chamber were obtained.
机译：稀薄大口径天然气发动机的燃烧通常由扫气式前室引起。预燃室中燃烧的热反应产物作为反应射流穿过主室，为稀薄的主室装料提供高点火能量。这些喷嘴中反应区的形状和强度是在主腔室中有效点火和放热的关键因素。详细研究了几何参数和操作参数对射流穿透过程中反应的影响。由于本研究中使用的可周期性充电的高压燃烧电池提供了通向整个主腔室的完全光学通道，因此根据OH *化学发光研究了反应区空间分布的演变。由于射流穿透是一个非常快速且高度瞬态的过程，因此以f = 30000 Hz的频率记录了OH *的排放。射流区域的宏观反应区参数（穿透长度和角度，反应区域和发光）揭示了孔口尺寸和预燃室气体注入对射流与主腔室贫油之间剪切层中热量释放的影响。 。另外，示出了在这些区域中反应的发展对点火概率和主室压力升高的影响。通过适当选择预燃室孔口几何形状和运行参数的组合，可以显着提高主腔室内的点火概率和放热。

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