CAJ | 학술논문

在一台单缸柴油机上，以柴油为基准，掺入一定比例汽油和正丁醇组成柴油/汽油、柴油/正丁醇和柴油/汽油/正丁醇混合燃料，研究了较高 EGR 率下喷射时刻和喷射压力对于混合燃料低温燃烧特性和排放特性的影响。结果表明，在柴油中掺混汽油能够改善混合燃料挥发性，降低十六烷值，降低碳烟排放，同时略微提升热效率。掺混正丁醇除了上述优势之外，还能够降低总芳烃含量，且由于正丁醇分子含氧，极大地改善了碳烟排放。在较高 EGR率下，适当提前喷射时刻和提高喷射压力有助于降低碳烟、CO和THC排放，并能提高指示热效率。最大压升率是限制混合燃料喷射时刻进一步提前的主要因素。提高喷射压力对于高挥发性柴油混合燃料油气混合效果的改善作用比柴油弱。
재일태단항시유궤상，이시유위기준，참입일정비례기유화정정순조성시유/기유、시유/정정순화시유/기유/정정순혼합연료，연구료교고 EGR 솔하분사시각화분사압력대우혼합연료저온연소특성화배방특성적영향。결과표명，재시유중참혼기유능구개선혼합연료휘발성，강저십륙완치，강저탄연배방，동시략미제승열효솔。참혼정정순제료상술우세지외，환능구강저총방경함량，차유우정정순분자함양，겁대지개선료탄연배방。재교고 EGR솔하，괄당제전분사시각화제고분사압력유조우강저탄연、CO화THC배방，병능제고지시열효솔。최대압승솔시한제혼합연료분사시각진일보제전적주요인소。제고분사압력대우고휘발성시유혼합연료유기혼합효과적개선작용비시유약。
The effects of injection timing and injection pressure on low temperature combustion and emissions were investigated on a single-cylinder diesel engine at high EGR rate. Blended fuels including diesel/gasoline,diesel/n-butanol and diesel/gasoline/n-butanol were formulated by blending gasoline and n-butanol with diesel. The results show that the addition of gasoline can improve volatility and reduce the cetane number of diesel,thus reducing soot emission with slightly improved thermal efficiency. In addition,the reduction in aromatic component and the pres-ence of oxygen content of diesel/n-butanol and diesel/gasoline/n-butanol blended fuel can further reduce soot emis-sion. Under high EGR condition,the appropriate advance of injection timing and the increase of injection pressure are conducive to the reduction of soot emission and the improvement of indicated thermal efficiency. The further ad-vance of injection timing is restricted by the maximum pressure rise rate. Diesel can be more obviously improved by increasing injection pressure than blended fuels with high volatility.