高温 EGR 下氨/柴油双直喷燃烧特性

Combustion Characteristics of Diesel-Ammonia Dual Direct Injection Under High Temperature EGR

摘要

基于快速压缩膨胀机可视化平台,利用自然发光法,研究了高温 EGR 环境下不同液氨喷射时刻和缸内初始温度对液氨/柴油双直喷燃烧特性.结果表明:当柴油喷射时刻固定时,两种燃料的喷射相位差过大会导致燃烧恶化.氧气浓度下降使柴油滞燃期延长,导致峰值放热率和表征放热量都会下降,且放热率峰值出现时刻延后.初始温度升高可以大幅改善双燃料的燃烧特性.但氧体积分数降低至 17%时,即使温度升至 500 K,液氨难以被引燃,且柴油燃烧被抑制.

Abstract

Based on the visualization platform of a rapid compression and expansion machine, the natural luminosity imaging method was employed to investigate the effects of different liquid ammonia injection timings and initial in-cylinder temperatures on the combustion characteristics of liquid ammonia/diesel dual direct injection under a high-temperature EGR(exhausted gas recycle) environment. The results indicate that when the diesel injection timing was fixed, an excessively large injection phase difference between the two fuels led to combustion deterioration. A decrease in oxygen concentration prolonged the ignition delay period of diesel, resulting in a reduction in both the peak heat release rate and the represented heat release, along with a delay in the occurrence of the peak heat release rate. An increase in the initial temperature significantly improved the combustion characteristics of the dual-fuel system. However, when the oxygen content was reduced to 17%, even with the temperature increased to 500 K, the liquid ammonia was difficult to ignite, and the combustion of diesel was inhibited.

关键词

快速压缩膨胀机 / 废气再循环 / 氨/柴油双直喷 / 燃烧

Key words

rapid compression and expansion machine / EGR / amomonia/diesel direct injection / combustion

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基金资助

工信部高技术船舶专项资助项目