双组分层撞击流反应器流场时空演化数值模拟
Numerical study on temporal and spatial evolution of flow fields in a two-layer impinging stream reactor
张建伟 1刘名扬 1董鑫 1冯颖1
作者信息
- 1. 沈阳化工大学 机械与动力工程学院,辽宁 沈阳 110142
- 折叠
摘要
为了研究双组分层撞击流反应器流场时空演化规律,利用大涡模拟方法进行数值模拟.结合第三代涡识别方法在空间尺度上,对轴向面、周向环面和径向面的速度场、涡量场进行分析;在时间尺度上,揭示速度场、涡量场和涡当地旋转轴的演化规律.结果表明:轴向面和径向面的涡强度呈多峰分布,周向环面涡强度的变化分为增强-稳定-增强 3 阶段.以XOY面作为研究参考,在两层喷嘴间依据涡发生位置的变化和多尺度涡的碰撞、破碎情况,涡发生期分为 6 个阶段,涡演化周期分为 12 个阶段,可据此预测反应器内部流型变化和流场所处阶段.
Abstract
In order to study the temporal and spatial evolution of flow fields in a two-layer impinging stream reactor,a large eddy simulation(LES)method was used for numerical simulation.The velocity field and vorticity field of the axial,circumferential and radial surfaces on the spatial scale were analyzed together with the third generation vortex identification method.The evolution law of velocity field,vorticity field and vortex local rotation axis was revealed on the time scale.The results show that the vortex intensity of the axial and radial surfaces is multi-peak distribution,and the change of the vortex intensity of the circumferential torus can be divided into three stages:enhancement-stability-enhancement.Considering the XOY surface as an example,the vortex generation period can be divided into 6 stages according to position change of the vortex and the collision and fragmentation of the multi-scale vortex between the two nozzle layers,and the vortex evolution period can be divided into 12 stages,which is useful to predict the flow pattern change and flow field stage in the reactor.
关键词
撞击流/湍流/流场/数值模拟/时空演化/流体力学Key words
impinging stream/turbulent flow/flow field/numerical simulation/temporal and spatial evolution/fluid mechanics引用本文复制引用
基金项目
国家自然科学基金(21476141)
辽宁省教育厅科研项目(LQ2020017)
辽宁省教育厅科研项目(LJ2020036)
辽宁省"兴辽英才计划"高水平创新创业团队项目(XLYC1808025)
中央引导地方科技发展资金计划(第一批)(2023JH6/100100037)
沈阳化工大学优青托举计划(2022YQ005)
出版年
2024
国家科技期刊平台
NSTL
万方数据