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Impact of low reactivity fuel type on low load combustion, emissions, and cyclic variations of diesel-ignited dual fuel combustion
International Journal of Engine Research ( IF 2.2 ) Pub Date : 2021-08-27 , DOI: 10.1177/14680874211041993
Prabhat R Jha 1 , Kendyl R Partridge 2 , Sundar R Krishnan 2 , Kalyan K Srinivasan 2
Affiliation  

In this study, cyclic variations in dual fuel combustion with diesel ignition of three different low reactivity fuels (methane, propane, and gasoline) are examined under identical operating conditions. Experiments were performed on a single cylinder research engine (SCRE) at a low load of 3.3 bar brake mean effective pressure (BMEP). The start of injection (SOI) of diesel was varied from 280 to 330 absolute crank angle degrees (CAD). Engine speed, rail pressure, and boost pressure were held constant at 1500 rpm, 500 bar, and 1.5 bar, respectively. The energy substituted by the low reactivity fuel was fixed at 80% of the total energy input. It was found that diesel-methane (DM) and diesel-propane (DP) combustion were affected by diesel mixing to a greater extent than diesel-gasoline (DG) combustion due to the higher reactivity of gasoline. The magnitude of low temperature heat release was greatest for DG combustion followed by DM and DP combustion for all SOIs. The ignition delay for DG combustion was the shortest, followed by DM and DP combustion. DM and DP combustion exhibited more cyclic variations than DG combustion. Cyclic variations decreased for DM and DP combustion when SOI was advanced; however, DG combustion cyclic variations remained essentially constant for all SOIs. Earlier SOIs (280, 290, 300, and 310 CAD) for DM and (280, 290, and 300 CAD) for DP combustion indicated some prior-cycle effects on the combustion and IMEP (i.e. some level of determinism).



中文翻译:

低反应性燃料类型对柴油点火双燃料燃烧的低负荷燃烧、排放和循环变化的影响

在这项研究中,在相同的操作条件下,研究了三种不同的低反应性燃料(甲烷、丙烷和汽油)的双燃料燃烧与柴油点火的循环变化。在 3.3 bar 制动平均有效压力 (BMEP) 的低负载下,在单缸研究发动机 (SCRE) 上进行了实验。柴油的喷射开始 (SOI) 从 280 到 330 绝对曲柄角度 (CAD) 变化。发动机转速、轨道压力和增压压力分别保持在 1500 rpm、500 bar 和 1.5 bar 不变。低反应性燃料替代的能量固定为总能量输入的 80%。发现柴油-甲烷(DM)和柴油-丙烷(DP)燃烧受柴油混合的影响比柴油-汽油(DG)燃烧更大,因为汽油的反应性更高。DG 燃烧的低温热释放量最大,其次是所有 SOI 的 DM 和 DP 燃烧。DG 燃烧的点火延迟最短,其次是 DM 和 DP 燃烧。DM 和 DP 燃烧比 DG 燃烧表现出更多的循环变化。当 SOI 提前时,DM 和 DP 燃烧的循环变化减少;然而,所有 SOI 的 DG 燃烧循环变化基本保持不变。DM 的早期 SOI(280、290、300 和 310 CAD)和 DP 燃烧的(280、290 和 300 CAD)表明对燃烧和 IMEP 的一些前循环影响(即某种程度的确定性)。DM 和 DP 燃烧比 DG 燃烧表现出更多的循环变化。当 SOI 提前时,DM 和 DP 燃烧的循环变化减少;然而,所有 SOI 的 DG 燃烧循环变化基本保持不变。DM 的早期 SOI(280、290、300 和 310 CAD)和 DP 燃烧的(280、290 和 300 CAD)表明对燃烧和 IMEP 的一些前循环影响(即某种程度的确定性)。DM 和 DP 燃烧比 DG 燃烧表现出更多的循环变化。当 SOI 提前时,DM 和 DP 燃烧的循环变化减少;然而,所有 SOI 的 DG 燃烧循环变化基本保持不变。DM 的早期 SOI(280、290、300 和 310 CAD)和 DP 燃烧的(280、290 和 300 CAD)表明对燃烧和 IMEP 的一些前循环影响(即某种程度的确定性)。

更新日期:2021-08-27
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