氨/正庚烷双燃料喷雾着火与污染物生成研究
Study on ammonia/n-heptane dual-fuel spray ignition and pollutants formation
张尊华 1余伟平 1韦一 1董东升1
作者信息
- 1. 武汉理工大学船海与能源动力工程学院,湖北 武汉 430074
- 折叠
摘要
针对氨/正庚烷双燃料喷雾开展大涡模拟,研究环境温度(Ta)对双燃料喷雾着火与污染物生成的影响.结果表明:提升Ta促进了正庚烷喷雾和氨/正庚烷双燃料喷雾的着火过程;相同Ta下,双燃料喷雾着火延迟时间比正庚烷喷雾长30%左右.双燃料喷雾中,NO2分布在当量比大于1、温度为900～1 150 K的喷雾中部区域,N2O集中在当量比大于1、温度为1 150～1 500 K的喷雾内部区域,而NO主要分布在当量比为1、温度大于2 000 K的喷雾头部区域.此外,提升Ta促进了双燃料喷雾中NO的产生,抑制NO2和N2O的生成.化学动力学分析表明:双燃料喷雾中NO主要由与HNO相关的高温反应生成,而85%左右的NO2和N2O是通过反应R285和R251生成.
Abstract
The Large-eddy simulation was conducted to investigate the effects of ambient temperature(Ta)on the ignition and pollutant formation in NH3/n-C7H16 dual-fuel spray.The results indicate that increasing Ta promotes the ignition of n-C7H16 spray and NH3/n-C7H16 dual-fuel spray.At the same Ta,the ignition delay time of dual-fuel spray is about 30%longer than that of n-C7H16 spray.In the dual-fuel spray,NO2 is distributed in the middle region of the spray with equivalence ratio greater than 1 and temperature between 900～1 150 K.Subsequently,N2O is concentrated in the internal region of the spray with equivalence ratio greater than 1 and temperature between 1 150～1 500 K,while NO mainly distributes in the head region of the spray with equivalence ratio of 1 and temperature greater than 2 000 K.Moreover,increasing Ta promotes the production of NO in the dual-fuel spray while inhibiting the generation of NO2 and N2O.Chemical kinetic analysis reveals that NO in the dual-fuel spray is mainly generated by high-temperature reactions related to HNO,while approximately 85%of NO2 and N2O are produced through reactions R285 and R251.
关键词
氨燃料/环境温度/双燃料喷雾/大涡模拟/NO/NO2/N2OKey words
ammonia/ambient temperature/dual-fuel spray/large-eddy simulation/NO/NO2/N2O引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
万方数据