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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Partially Premixed Combustion Application for Diesel Power Improvement
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Partially Premixed Combustion Application for Diesel Power Improvement

机译：部分预混燃烧在改善柴油机动力中的应用

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A partially premixed combustion (PPC) approach was applied in a single cylinder diesel research engine in order to characterize engine power improvements. PPC is an alternative advanced combustion approach that generally results in lower engine-out soot and oxides of nitrogen (NO _( x ) ) emission, with a moderate penalty in engine-out unburned hydrocarbon (UHC) and carbon monoxide (CO) emissions. In this study, PPC is accomplished with a minority fraction of jet fuel injected into the intake manifold, while the majority fraction of jet fuel is delivered directly to the combustion chamber near the start of combustion (SOC). Four compression ratios (CR) were studied. Exhaust emissions plus exhaust opacity and particulate measurements were performed during the experiments in addition to fast in-cylinder combustion metrics. It was seen that as CR increased, the soot threshold equivalence ratio decreased for conventional diesel combustion; however, this afforded an increased opportunity for higher levels of port injected fuel leading to power increases from 5% to 23% as CR increased from 14 to 21.5. PPC allowed for these power increases (defined by a threshold opacity level of 3%) due to smaller particles (and lower overall number of particles) in the exhaust that influence measured opacity less significantly than larger and more numerous conventional diesel combustion exhaust particulates. Carbon monoxide levels at the higher PPC-driven power levels were only modestly higher, although NO _( x ) was generally lower due to the overall enriched operation.
机译：部分预混燃烧（PPC）方法应用于单缸柴油研究型发动机，以表征发动机功率的提高。 PPC是一种替代性的高级燃烧方法，通常会降低发动机排出的烟灰和氮氧化物（NO _（x））的排放，同时降低发动机排出的未燃碳氢化合物（UHC）和一氧化碳（CO）的排放量。在这项研究中，PPC是通过将少量的喷气燃料注入进气歧管来完成的，而大部分的喷气燃料则在燃烧开始（SOC）附近直接输送到燃烧室。研究了四个压缩比（CR）。除了快速缸内燃烧指标外，还在实验过程中进行了排气排放，排气不透明度和颗粒物测量。可以看出，随着CR的增加，传统柴油机燃烧的烟尘阈值当量比降低；但是，这为增加端口注入燃油的水平提供了更多机会，导致随着CR从14增至21.5，功率从5％增至23％。 PPC允许这些功率增加（由3％的阈值不透明度级别定义），这是因为排气中的较小颗粒（和较低的颗粒总数）对测量的不透明度的影响不及更大，数量更多的常规柴油机燃烧排气颗粒。在较高的PPC驱动的功率水平下，一氧化碳水平仅适度地较高，尽管由于总体富集运行，NO_（x）通常较低。

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