
1. 武汉理工大学船海与能源动力工程学院
2. 船舶运输控制系统国家工程研究中心
Published:2025
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张祥杰, 王忠俊, 张尊华, et al. 不同环境氧体积分数下甲醇喷雾自着火特性数值模拟[J]. 2025, (3): 211-221.
张祥杰, 王忠俊, 张尊华, et al. 不同环境氧体积分数下甲醇喷雾自着火特性数值模拟[J]. 2025, (3): 211-221. DOI: 10.16236/j.cnki.nrjxb.202503025.
基于计算流体动力学软件CONVERGE,利用大涡模拟方法对环境温度为1 200 K、环境压力为7.77 MPa条件下定容燃烧弹中甲醇喷雾自着火过程进行了数值模拟研究,重点解析环境氧体积分数(21%、15%和10%)对甲醇喷雾自着火特性的影响.结果表明:环境氧体积分数由21%降至15%,着火延迟时间(IDT)增加了2.5%,环境氧体积分数由15%降至10%
IDT则增加了8.1%.在环境氧体积分数为10%时,甲醇燃烧过程生成微量OH并且始终分布于甲醇喷雾轮廓处.从CH
2
O时空分布特征来看,随着氧体积分数的降低,CH
2
O生成的温度区间范围变窄、当量比区间范围变宽,CH
2
O的空间分布范围增大且质量分数分布更加均匀.由此可见,环境氧体积分数变化显著影响了甲醇喷雾着火特性,进而影响其关键自由基(CH
2
O、OH)的生成及分布.
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