汽油/柴油双燃料HPCC在不同转速下的高负荷研究
首发时间:2013-03-15
摘要:本文在一台改造的的单缸柴油机上试验研究了汽油/柴油双燃料高比例预混合低温燃烧(HPCC)模式,其中汽油由进气道喷射,柴油采用缸内直喷并引燃预混合气。文中主要以1600 r/min为例,分析了影响负荷扩展的运行参数,通过增加油量并优化各运行参数直至达到如下限定条件即得出900~2500 r/min下的高负荷优化点:NOx≤0.4 g/(kWoh)、Soot≤0.01 g/(kWoh)、MPRR(最大压升率)≤1 MPa/ CA、COVIMEP(循环波动系数)≤10%。高负荷优化点的IMEP值在低、中、高转速下分别受NOx排放、最大压升率及极限缸压的限制,且随转速的升高而升高,在2300 r/min取得最大值1.2 MPa。指示比油耗在1900 r/min取得最低值为168.6 g/(kWoh)。HC、CO排放偏高,可通过氧化后处理器解决。
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Study on High Load of HPCC Fuelled with Gasoline/Diesel Dual Fuel at Different Engine Speeds
Abstract:This study investigates the gasoline/diesel dual fuel high premixed charge combustion (HPCC) mode in a modified single-cylinder diesel engine. In this technique, in-cylinder fuel blending using intake air port fuel injection of gasoline and direct injection of diesel fuel is proposed as the fuel delivery and blending strategy and the diesel serves as the ignition source. By taking mainly 1600 r/min speed as an example, the influences of operating parameters on extending higher load were analyzed first. In order to obtain the optimal points of high load at the speed of 900 to 2500 r/min with HPCC mode, the experiments were carried out on different engine speeds where the load was increased with increasing the fuel mass and optimizing the operating parameters until predefined limits were reached. These predefined limits are emissions of NOx lower 0.4 g/(kWoh) and Soot lower 0.01 g/(kWoh), the maximal pressure rise rate (MPRR) lower1 MPa/ CA and coefficient of variable of IMEP (COVIMEP)lower 10%. The results shown that the limits of the optimal high load IMEP number at lower, middle and high speeds are the high values of NOx emissions, MPRR and peak cylinder pressure, respectively. Furthermore the IMEP increased with the speed increased and which can reach 1.2 MPa. It was found that the lowest ISFC value of 168.6 g/(kWoh) was obtained at 1900 r/min. The high emissions of HC and CO make it necessary to use the oxygenic after treatment.
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汽油/柴油双燃料HPCC在不同转速下的高负荷研究
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