摘要
采用欧拉双流体模型及颗粒动理学理论,对洁净煤发电系统关键单元中的气固喷射器内的气固两相流动进行三维数值模拟。结果表明,在该喷射器的收缩段的下壁面有一明显的固体颗粒聚集区,这与实验观察到的现象基本一致;气体在喷射器中心形成一个高速射流区域,由于高速气流的卷吸作用,高速射流区的两侧有明显的回流现象;固体颗粒速度最大的地方离气体入口有一段距离。为了进一步验证模型,气固喷射器内静压分布的数值结果与实验进行了比较,结果表明:基于欧拉双流体模型的三维数值模拟结果和试验结果吻合得较好,平均误差较小,这说明该模拟方法是成功的,可为进一步研究与节能减排相关装置的气固喷射器的复杂气固流动特性提供参考。
By using three-dimensional numerical simulation techniques together with the Eulerian-Eulerian method, a numerical simulation research of the gas-solid phase flows within the gassolid injector which is the key element of clean coal power generation system is performed in this paper.It is found that many particles are accumulated in a certain region,which matches the experimental result.The driving gas makes a high-speed jet region in the center of the injector,due to which,obvious returning phenomenon can be found.The region where the solid particles have the fastest speed has a distance from the gas entrance.To further test this model,the static pressure distribution in the injector is compared with experimental result.The results are in good agreement and the average error is comparatively small.Thus the Eulerian-Eulerian method is successful and can be referred to in further study.
出处
《能源研究与利用》
2008年第1期17-21,共5页
Energy Research & Utilization
基金
国家高技术研究发展计划(863计划)(2006AA05A103)
东南大学大学生科研训练项目(07031094)
关键词
节能减排
洁净煤发电
气固喷射器
数值模拟
欧拉模型
energy saving ＆ emission reduction
clean coal power generation
gas-solid injector
numerical simulation
eulerian model
