甲醇喷射参数对柴油微引燃甲醇直喷发动机性能影响研究

Effect of Methanol Injection Parameters on Performance of Diesel Micro-Pilot Igniting Methanol Direct Injection Engine

摘要

以一台柴油机为基础机,采用同轴双芯甲醇-柴油双燃料喷射器实现甲醇缸内直喷柴油微喷引燃燃烧模式,对柴油微喷引燃缸内直喷甲醇(micro-pilot diesel igniting direct injection methanol,MDDM)发动机进行了深入的性能研究.结果表明:甲醇12孔直喷喷嘴喷入缸内的甲醇液滴具有更大贯穿距,在缸内气体运动带动下,利于缸内形成全局更加均匀的混合气,热效率最高,约为46.6%；NO_x排放为6.28 g/(kW·h).甲醇喷射正时对MDDM发动机燃烧相位具有较明显影响,对于喷射正时-13 °CA ATDC工况,燃烧中心CA50相对于其他喷射正时处于更加合理位置,热效率最高为46.9%.NO_x排放为9 g/(kW·h).

Abstract

Based on a diesel engine, a coaxial dual-core methanol-diesel dual-fuel injector was adopted to realize methanol direct injection with micro-pilot diesel ignition, and an in-depth performance study was conducted on the micro-pilot diesel igniting direct injection methanol(MDDM) engine. The results showed that the methanol droplets, which are injected into the combustion chamber through a 12-hole direct-injection methanol nozzle, have a larger penetration distance, which, under the influence of in-cylinder gas motion, facilitates more uniform mixing of the air-fuel mixture. This configuration achieves the highest thermal efficiency of approximately 46.6% with the NO_x emissions of 6.28 g/(kW·h). The injection timing of methanol has a significant impact on the combustion phase of the MDDM engine. Under the injection timing condition of -13 °CA ATDC, the combustion center CA50 is positioned at a more reasonable location compared to other injection timings, resulting in the highest thermal efficiency of 46.9%. The NO_x emissions in this case are 9 g/(kW·h).

关键词

甲醇 / 直喷喷嘴 / 喷射正时 / 热效率

Key words

methanol / direct injection injector / injection timing / thermal efficiency

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