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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >INVESTIGATION OF DESIGN PARAMETERS IN PARTIALLY PREMIXED COMPRESSION IGNITION COMBUSTION USING ADAPTIVE INJECTION STRATEGIES
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INVESTIGATION OF DESIGN PARAMETERS IN PARTIALLY PREMIXED COMPRESSION IGNITION COMBUSTION USING ADAPTIVE INJECTION STRATEGIES

机译：基于自适应注射策略的部分预混合压燃燃烧设计参数研究

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Premixed combustion strategies have been shown to yield very low NOx and soot emissions, while maintaining diesel-like efficiency; however, several issues must be addressed before they can gain widespread acceptance. This paper provides guidelines for solving problems with premixed combustion strategies, viz.: lack of combustion phasing control, excessive pressure rise rate, and spray wall impingement due to early injections. Cooled EGR and a multiple injection concept is used to control combustion phasing and reduce the peak pressure rise rate. To address spray-wall impingement, an Adaptive Injection Strategy (AIS) is employed. This strategy uses two injection pulses at different injection pressures to prepare an optimal in-cylinder mixture. The first injection is early in the cycle and utilizes a low injection pressure to minimize spray-wall impingement and create a well mixed charge. The second injection is near TDC and uses a high injection pressure in order to promote air entrainment and droplet dispersion.rnThis study uses a multi-dimensional CFD code coupled with detailed chemistry, the KIVA-CHEMKIN code, to investigate the effects of several influential design parameters and identify emissions and performance tradeoffs. The combustion process considered is at a light load operating condition (nominal IMEP of 5.5 bar and high speed, 2000 rev/min).rnThe parameters studied were: first and second pulse injection pressure and timing, IVC timing, EGR rate, fuel split, swirl ratio, and spray targeting. The investigation showed that the use of low pressure injections early in the cycle allows improved flexibility in fuel quantity and injection timing. An improved solution was found with near zero NOx and soot, a net ISFC of only 175 g/kW-hr, and a peak pressure rise rate of ～8 bar/deg.
机译：已显示出预混合燃烧策略可产生非常低的NOx和烟尘排放，同时保持类似柴油的效率。但是，在获得广泛接受之前，必须解决一些问题。本文提供了解决预混燃烧策略问题的指南，即：缺乏燃烧定相控制，过高的压力上升率以及由于早期喷射而引起的喷壁撞击。冷却的EGR和多次喷射概念可用于控制燃烧定相并降低峰值压力上升率。为了解决喷壁撞击，采用了自适应喷射策略（AIS）。该策略使用两个在不同喷射压力下的喷射脉冲来制备最佳的缸内混合物。第一次喷射在循环的早期进行，并利用低喷射压力来最大程度地减小喷壁撞击并产生充分混合的装药。第二次注射接近TDC，并使用高注射压力以促进空气夹带和液滴分散。rn本研究使用多维CFD代码结合详细的化学成分KIVA-CHEMKIN代码，研究了几种有影响力的设计的效果参数并确定排放和性能之间的权衡。所考虑的燃烧过程是在轻负载工况下（标称IMEP为5.5巴，高速，2000转/分钟）。研究的参数为：第一和第二脉冲喷射压力和正时，IVC正时，EGR率，燃料分配，涡流比和喷雾目标。研究表明，在循环的早期使用低压喷射可以提高燃油量和喷射正时的灵活性。发现了一种改进的解决方案，其NOx和烟灰接近于零，净ISFC仅175 g / kW-hr，峰值压力上升率约为8 bar / deg。

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