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首页> 外文期刊>International journal of engine research >Late post-injection of biofuel blends in an optical diesel engine: Experimental and theoretical discussion on the inevitable wall-wetting effects on oil dilution
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Late post-injection of biofuel blends in an optical diesel engine: Experimental and theoretical discussion on the inevitable wall-wetting effects on oil dilution

机译：光学柴油发动机中的生物燃料后期注射后注射：关于油脂不可避免的壁润湿作用的实验和理论探讨

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摘要

In a diesel engine, diesel particulate filter is used to reduce particle matter emissions. Diesel particulate filter requires periodic regenerations under high-temperature conditions in the exhaust pipe in order to oxidize the accumulated soot. A common strategy to produce high exhaust gas temperature is to inject late post-injections after the main injection. However, this practice may dilute the engine oil, causing engine wear. Biofuel addition to petroleum diesel may increase oil dilution even more. This is related to the fuel spray characteristics, the post-injection control and the vaporization process of fuel in engine oil. In this study, spray properties of late post-injection were studied with petroleum diesel and two types of transport biofuel blends containing 30% either fatty acid methyl ester or hydro-treated vegetable oil. Three different late post-injection timings were investigated. Image sequences of the main spray flame as well as the non-combusting late post-injection spray were extracted. In order to verify oil dilution during regeneration cycle and late post-injection, oil samples from six-cylinder test engine were analyzed. According to the present experiments, differences in the spray characteristics are not significant with the tested fuels. However, higher oil dilution rates were observed with fuel blend composed of 30% fatty acid methyl ester. All the studied late post-injection timings were noted to lead to the unwanted cylinder spray/wall interaction and wall-wetting consequently diluting the engine oil. The spray/wall interaction is thoroughly explained by introducing a theoretical/computational framework which characterizes any spray/wall interaction in terms of a phase diagram for any considered operation conditions. The novelty of this study arises from (1) first comparison of fatty acid methyl ester and hydro-treated vegetable oil blends in an optical engine, (2) strong evidence on the phenomena related to post-injection phase in six-cylinder and single-cylinder optical engine configurations and (3) the development of a single-droplet model showing inevitable wall-wetting.
机译：在柴油发动机中，柴油颗粒过滤器用于减少颗粒物质排放。柴油颗粒过滤器需要在排气管中的高温条件下定期再生，以氧化积累的烟灰。产生高排气温度的常见策略是在主注射后注入晚期后注射。然而，这种做法可能会稀释发动机油，导致发动机磨损。石油柴油的生物燃料可以增加油脂稀释。这与发动机油中的燃料喷射特性，注射后控制和汽化过程有关。在该研究中，用石油柴油和两种类型的运输生物燃料混合物研究了晚期注射后注射的喷雾性能，含有30％的脂肪酸​​甲酯或水力处理的植物油。研究了三个不同晚期注射时间。提取主喷雾火焰的图像序列以及未燃烧晚期注射喷雾。为了在再生循环期间验证油稀释，分析来自六缸试验机的油样品。根据本实验，喷射特性的差异与测试燃料不显着。然而，用由30％脂肪酸甲酯组成的燃料共混物观察到更高的油稀释率。所有研究的晚期后喷射时间都被注意到导致不需要的气缸喷涂/壁相互作用和壁润湿，因此稀释了发动机油。通过引入理论/计算框架来彻底解释喷雾/壁相互作用，该框架在任何考虑的操作条件的相图中表征了任何喷射/壁相互作用。本研究的新颖性来自（1）首先比较脂肪酸甲酯和热处理的植物油在光学发动机中的植物油混合物，（2）关于六缸内注射阶段相关的现象的有力证据和单一 - 气缸光学发动机配置和（3）开发单滴模型，显示不可避免的壁润湿。

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