摘要
基于将颗粒脉动分成湍流引起的大尺度脉动和颗粒间碰撞产生的小尺度脉动的概念,用统一的方法处理两类脉动,建立了稠密两相流动的双尺度二阶矩两相湍流模型。用该模型对下行床内稠密两相流动进行了数值模拟。模拟结果和实验结果符合,和考虑碰撞的单尺度二阶矩湍流模型的结果接近,比其有一定程度的改进。结果表明,由于颗粒的碰撞,小尺度脉动也呈一定程度的各向异性,而且小尺度脉动和大尺度脉动在大部分区域内减小,而在接近壁面处增大。
A two-scale, second-order moment, two-phase turbulence model which accounts for inter-particle collisions was developed with large-scale particle fluctuations due to turbulence and small-scale particle fluctuations due to collisions. The model was then used to simulate dense gas-particle flows in downcomers. The simulation results agree well with experimental results in the literature and are somewhat better than those obtained using the unified second-order moment （USM-Θ） model. The results show that the small-scale fluctuations are anisotropic due to the inter-particle collision with the large-scale and small-scale fluctuations decreasing in most regions, but increasing near the wall.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第8期1095-1098,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家"九七三"重点基础研究项目(G1999-0222-08)
中国博士后科学基金资助项目(2004036239)
关键词
两相流动
二阶矩模型
双尺度脉动
two-phase flows
second-order moment model two-scale fluctuations
