An experimental study into the effect of the pilot injection timing on the performance and emissions of a high-speed common-rail dual-fuel engine
An experimental study into the effect of the pilot injection timing on the performance and emissions of a high-speed common-rail dual-fuel engine
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DOI：
10.1177/0954407013506180
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发表时间：
2014-02
期刊：
影响因子：
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通讯作者：
J. Rimmer;Stephen Johnson;A. Clarke
中科院分区：
文献类型：
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作者：
J. Rimmer;Stephen Johnson;A. Clarke
双燃料技术有可能大大改善轻型压燃式发动机的二氧化碳排放。在这些较小容量的高速发动机中，其中燃烧事件可以在时间上较短，喷射正时可以对发动机的性能和排放特性具有重要影响。本文论述了利用0.51升单缸高速直喷柴油机改造实现进气道定向喷射的方法。在发动机转速为1500 r/min和2500 r/min、总指示平均有效压力为0.15 MPa、0.3 MPa、0.45 MPa和0.6 MPa的负荷下，研究了引燃柴油喷射定时对双燃料发动机性能和排放的影响。固定气体替代率（基于能量）为50%。此外，在发动机转速为1500 r/min的恒定条件下，通过在每个负载条件下的优化喷射正时完成气体置换扫描，研究了引燃喷射量的影响。结果确定了双燃料燃烧期间单次喷射正时的限制，以及通过优化引燃喷射正时可以实现的发动机性能和稳定性的增益。此外，引燃喷射正时和量被证明对一氧化碳、氮氧化物和总烃的形成和排放具有根本性的影响。还强调了双燃料燃烧实现显著减少二氧化碳排放的潜力，与基准柴油情况相比，在满负荷时可减少高达30%。
Dual-fuel technology has the potential to offer significant improvements in the emissions of carbon dioxide from light-duty compression ignition engines. In these smaller-capacity high-speed engines, where the combustion event can be temporally shorter, the injection timing can have an important effect on the performance and emissions characteristics of the engine. This paper discusses the use of a 0.51 l single-cylinder high-speed direct-injection diesel engine modified to achieve port directed gas injection. The effect of the pilot diesel injection timing on the dual-fuel engine performance and emissions was investigated at engine speeds of 1500 r/min and 2500 r/min and loads equivalent to gross indicated mean effective pressures of 0.15 MPa, 0.3 MPa, 0.45 MPa and 0.6 MPa, for a fixed gas substitution ratio (on an energy basis) of 50%. Furthermore, the effect of the pilot injection quantity was investigated at a constant engine speed of 1500 r/min by completing a gaseous substitution sweep at the optimised injection timing for each load condition. The results identify the limits of single-injection timing during dual-fuel combustion and the gains in the engine performance and stability that can be achieved through optimisation of the pilot injection timing. Furthermore, the pilot injection timing and quantity were shown to have fundamental effects on the formation and emissions of carbon monoxide, nitrogen oxide and total hydrocarbon. The potential for dual-fuel combustion to achieve significant reductions in the specific carbon dioxide was also highlighted, with reductions of up to 30% being achieved at full load compared with the baseline diesel case.