Experimental study on the high load extension of PODE/methanol RCCI combustion mode with optimized injection strategy
Experimental study on the high load extension of PODE/methanol RCCI combustion mode with optimized injection strategy
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优化喷射策略PODE/甲醇RCCI燃烧模式高负荷延伸实验研究
DOI：
10.1016/j.fuel.2021.122726
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发表时间：
2021-12
期刊：
影响因子：
7.4
通讯作者：
Shaokang Liu
中科院分区：
文献类型：
--
作者：
Lejian Wang;Junheng Liu;Qian Ji;Ping Sun;Jie Li;Mingliang Wei;Shaokang Liu
在高压共轨柴油机上，通过直接喷射高反应性燃料PODE点燃低反应性燃料预混甲醇，实现了PODE/甲醇反应性控制压燃（RCCI）模式。研究了负荷扩展比（LER）对RCCI发动机缸内燃烧、排放和经济性的影响，系统研究了PODE喷射策略对PODE/甲醇RCCI高负荷扩展的影响，包括主喷射开始（SOImain）、预喷射开始（SOIpilot）和预喷射量（PIQ）。结果表明：随着LER的增加，RCCI模式的缸内压力峰值和放热率峰值增大，制动热效率（BTE）、碳氢化合物（HC）、一氧化碳（CO）和非常规排放物（NO）也随之增加，但振铃强度（RI）、IMEP变异系数（COVIMEP）和氮氧化物（NOx）的增加限制了LER的进一步增加。延迟SOImain可以有效降低RI，但会导致CO和HC排放和燃油经济性恶化。预喷射策略可以削弱NOx和碳烟排放之间的权衡关系，提高燃烧稳定性。随着SOIpilot技术的发展，RCCI燃烧过程由两级放热向单级放热发展，HC、CO、NOx和碳烟排放均得到降低。随着PIQ的增加，PODE/甲醇RCCI模式的燃烧相位提前，RI、COVIMEP和IMEP增大。在59.5 mg/循环工况下，当PIQ从2 mg增加到10 mg时，CO和HC排放分别降低19.57%和6.97%，而NOx排放增加7.93%。在适当的LER和优化的PODE喷射策略的配合下，PODE/甲醇RCCI发动机的BTE达到48.68%，IMEP从0.77 MPa提高到1.08 MPa。
The polyoxymethylene dimethyl ethers (PODE)/methanol reactivity controlled compression ignition (RCCI) mode was realized by direct injection of PODE as high-reactivity fuel to ignite pre-mixed methanol as low-reactivity fuel in a high-pressure common-rail diesel engine. The effects of load extension ratio (LER) on in-cylinder combustion, emission characteristics and fuel economy of RCCI engine were investigated, and the influences of PODE injection strategy on the high-load extension of PODE/methanol RCCI mode were also systematically studied, including the start of main-injection (SOImain), start of pilot-injection (SOIpilot) and pilot-injection quantity (PIQ). The results show that with the increase of LER, the peak values of in-cylinder pressure and heat release rate of RCCI mode increase, the brake thermal efficiency (BTE) and the hydrocarbons (HC), carbon monoxide (CO) and unregulated emissions also increase, but the increase of the ringing intensity (RI), the coefficient of variation of IMEP (COVIMEP) and nitrogen oxides (NOx) limit the further increase of LER. The delay of SOImain can effectively reduce RI, but it will lead to the deterioration of CO and HC emissions and fuel economy. The pilot-injection strategy can weaken the trade-off relationship between NOx and soot emissions and improve combustion stability. With the advance of SOIpilot, the RCCI combustion process evolves from two-stage heat release to single-stage heat release, and the emissions of HC, CO, NOx and soot are reduced. With the increase of PIQ, the combustion phase of PODE/methanol RCCI mode advances, and the RI, COVIMEP and IMEP increase. At 59.5 mg/cycle condition, when PIQ is increased from 2 mg to 10 mg, CO and HC emissions decrease by 19.57% and 6.97% respectively, while NOx emissions increase by 7.93%. With the appropriate LER combined with the optimized PODE injection strategy, the BTE of PODE/methanol RCCI engine reaches 48.68%, and the IMEP is extended from 0.77 MPa to 1.08 MPa.
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