Effects of ethanol and different type of gasoline fuels on partially premixed combustion from low to high load
Effects of ethanol and different type of gasoline fuels on partially premixed combustion from low to high load
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DOI：
10.4271/2010-01-0871
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发表时间：
2010-04
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影响因子：
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通讯作者：
V. Manente;P. Tunestål;B. Johansson;W. Cannella
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文献类型：
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作者：
V. Manente;P. Tunestål;B. Johansson;W. Cannella
本文研究了乙醇和七种辛烷值在69 ~ 99之间的燃料在部分预混燃烧条件下的燃烧特性。在1300 rpm下从5至18 bar总IMEP进行负载扫描。实验中使用的发动机是单缸斯堪尼亚D12。为了允许高负荷操作并实现充分的混合，压缩比从标准的18：1降低到14.3：1。结果表明，通过仅使用50%的EGR，即使在高负荷下也可以实现低于0.30 g/kWh的NOx。在18巴下，汽油燃料的IMEP烟灰在1-2 FSN的范围内，而乙醇的IMEP烟灰低于0.06 FSN。高增压与相对短的燃烧持续时间相结合的使用允许达到54 - 56%范围内的总指示效率。在高负荷下，部分分层混合物允许保持最大压力上升率低于15巴/CAD与大多数燃料。对制动器参数进行了估算，发现制动器NOx可远低于EU VI目标值，制动器效率高于48.5%。根据排放和效率考虑，对燃料进行分类，并且发现对于该特定压缩比，最适合于该燃烧概念的燃料必须具有略低于90的罗恩。（减）
The behavior of Ethanol and seven fuels in the boiling point range of gasoline but with an Octane Number spanning from 69 to 99 was investigated in Partially Premixed Combustion. A load sweep was performed from 5 to 18 bar gross IMEP at 1300 rpm. The engine used in the experiments was a single cylinder Scania D12. To allow high load operations and achieve sufficient mixing, the compression ratio was decreased from the standard 18:1 to 14.3:1. It was shown that by using only 50% of EGR it is possible to achieve NOx below 0.30 g/kWh even at high loads. At 18 bar IMEP soot was in the range of 1-2 FSN for the gasoline fuels while it was below 0.06 FSN with Ethanol. The use of high boost combined with relatively short combustion duration allowed reaching gross indicated efficiencies in the range of 54 - 56%. At high load the partial stratified mixture allowed to keep the maximum pressure rise rate below 15 bar/CAD with most of the fuels. The brake parameters were estimated and it was found that brake NOx can be far below the EU VI target value and the brake efficiency higher than 48.5 %. According to emissions and efficiency considerations the fuels were classified and it was found that with this specific compression ratio the most suitable fuel for this combustion concept has to have a RON slightly below 90. (Less)