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

作　　者：张尊华[1] 余伟平 韦一 董东升 ZHANG Zunhua;YU Weiping;WEI Yi;DONG Dongsheng(School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430074,China)

机构地区：[1]武汉理工大学船海与能源动力工程学院,湖北武汉430074

出　　处：《华中科技大学学报(自然科学版)》2025年第1期121-128,共8页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(52471340);国家重点研发计划资助项目(2022YFB4301400);中央高校基本科研业务费专项资金资助项目(2024IVA020).

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,NO_(2)分布在当量比大于1、温度为900~1150 K的喷雾中部区域,N_(2)O集中在当量比大于1、温度为1150~1500 K的喷雾内部区域,而NO主要分布在当量比为1、温度大于2000 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NO_(2)和N_(2)O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NO_(2)和N_(2)O是通过反应R285和R251生成.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,NO_(2) is distributed in the middle region of the spray with equivalence ratio greater than 1 and temperature between 900~1150 K.Subsequently,N_(2)O is concentrated in the internal region of the spray with equivalence ratio greater than 1 and temperature between 1150~1500 K,while NO mainly distributes in the head region of the spray with equivalence ratio of 1 and temperature greater than 2000 K.Moreover,increasing Ta promotes the production of NO in the dual-fuel spray while inhibiting the generation of NO_(2) and N_(2)O.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 NO_(2) and N_(2)O 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/NO_(2)/N_(2)O 

分 类 号：TK46[动力工程及工程热物理—动力机械及工程]