| 各向同性湍流中颗粒引起湍流变动的直接模拟 |
| |
| 引用本文： | 柳朝晖,贺铸,李瑞霞,郑楚光.各向同性湍流中颗粒引起湍流变动的直接模拟[J].工程热物理学报,2006,27(Z1):221-224. |
| |
| 作者姓名： | 柳朝晖 贺铸 李瑞霞 郑楚光 |
| |
| 作者单位： | 华中科技大学煤燃烧国家重点实验室,湖北,武汉,430074 |
| |
| 基金项目： | 教育部跨世纪优秀人才培养计划;国家高技术研究发展计划(863计划) |
| |
| 摘 要： | 本文通过直接数值模拟对均匀各向同性湍流中颗粒对湍流的变动作用进行了研究.颗粒相的体积分数很小而质量载荷足够大,以至于颗粒之间的相互作用可以忽略不计,而重点考虑颗粒与湍流间能量的交换。颗粒对湍流的反向作用使得湍动能的耗散率增强,以至于湍动能的衰减速率增大.湍动能的衰减速率随颗粒惯性的增大而增大。三维湍动能谱显示,颗粒对湍动能的影响在不同的尺度上是不均匀的。在低波数段,流体带动颗粒,而高波数段则相反.
|
| 关 键 词： | 直接数值模拟 湍流变动 两向耦合 |
| 文章编号： | 0253-231X(2006)Suppl.1-0221-04 |
| 修稿时间： | 2006年1月25日 |
DIRECT NUMERICAL SIMULATION OF TURBULENCE MODULATION BY SMALL PARTICLES IN ISOTROPIC TURBULENCE |
| |
| LIU Zhao-Hui,HE Zhu,LI Rui-Xia,ZHENG Chu-Guang.DIRECT NUMERICAL SIMULATION OF TURBULENCE MODULATION BY SMALL PARTICLES IN ISOTROPIC TURBULENCE[J].Journal of Engineering Thermophysics,2006,27(Z1):221-224. |
| |
| Authors: | LIU Zhao-Hui HE Zhu LI Rui-Xia ZHENG Chu-Guang |
| |
| Abstract: | Direct numerical simulations(DNS)have been conducted to investigate the modulation of isotropic turbulence by particles.The volume fraction of the particles is large enough to modulate the turbulences,but small enough to avoid collisions between the particles.Particular focus is on the interaction between the turbulence and a large number of solid spherical particles dispersed within.In the particle-laden cases the viscous dissipation rate of the turbulent kinetic energy is enhanced,and because of the negative value of the energy change rate due to the particle drag force the turbulent kinetic energy decays faster than in the particle-free turbulence.The turbulent kinetic energy decay rate is larger for heavier particles(with larger inertia).The turbulent kinetic energy spectra show that there is a non-uniform distortion of the turbulence with a relative increase in small-scale energy and decrease in large-scale energy. |
| |
| Keywords: | direct numerical simulation turbulence modulation two-way coupling |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
