End-gas autoignition characteristics of PREMIER combustion in a pilot fuel-ignited dual-fuel biogas engine
End-gas autoignition characteristics of PREMIER combustion in a pilot fuel-ignited dual-fuel biogas engine
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DOI：
10.1016/j.fuel.2019.115634
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发表时间：
2019-10
期刊：
影响因子：
7.4
通讯作者：
Alireza Valipour Berenjestanaki;N. Kawahara;Kazuya Tsuboi;E. Tomita
中科院分区：
文献类型：
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作者：
Alireza Valipour Berenjestanaki;N. Kawahara;Kazuya Tsuboi;E. Tomita
为了提高内燃机在高负荷下的热效率，提出了将尾气区预混燃烧作为爆震的前兆。在本工作中，一台双燃料燃气发动机试验台在不同进气压力(101、150和200 kpa)下恒速运转。以模拟沼气为主要燃料，柴油为中试燃料。最大平均有效压力和热效率在Premier操作过程中非常明显，这是因为尾气区域的自燃。与爆震燃烧相似，顶燃具有两个阶段，但没有观察到压力振荡和压力的快速上升。我们在这里定义了一个新的参数，总理强度(PI)，它反映了总理燃烧的强度。随着喷射正时的提前和压力的增加，更多的循环经历了端部气体自燃；相关的热释放增加，因此，PI值上升。当预混燃料的压力和温度随着喷油正时的提前而升高时，尾气自燃开始得更早。随着进气压力的增大和喷油提前，尾气自燃延迟时间变短。
To improve the thermal efficiency of internal combustion engines at high loads, premixed mixture ignition in the end-gas region (PREMIER) combustion is proposed as a precursor to knocking. In the current work, a pilot fuel-ignited dual-fuel gas engine was operated at constant speed under different intake pressures (101, 150, and 200 kPa). A simulated biogas was served as the primary fuel and diesel as the pilot fuel. The maximum mean effective pressure and thermal efficiency were evident during PREMIER operation because of autoignition in the end-gas region. Similar to knocking combustion, PREMIER combustion features two stages but neither pressure oscillation nor a rapid pressure rise is observed. We here define a new parameter, the PREMIER intensity (PI), which reflects the strength of PREMIER combustion. As the injection timing was advanced and the pressure boosted, more cycles underwent end-gas autoignition; the associated heat release increased and, consequently, the PI value rose. When the pressure and temperature of a premixed fuel mixture rose as injection timing was advanced, end-gas autoignition commenced earlier. The end-gas autoignition delay became shorter as intake pressure was increased and injection timing advanced.