| 用考虑颗粒尾涡效应的双时间尺度耗散模型模拟流体的湍流变动 |
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| 引用本文： | 于勇,周力行,王保国.用考虑颗粒尾涡效应的双时间尺度耗散模型模拟流体的湍流变动[J].中国化学工程学报,2006,14(3):314-320. |
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| 作者姓名： | 于勇 周力行 王保国 |
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| 作者单位： | [1]Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China [2]School of Mechanical-Electronic Engineering, Bejing Institute of Technology, Beijing 100081, China |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金，教育部高等学校博士学科点专项科研基金 |
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| 摘 要： | Presently developed two-phase turbulence models under-predict the gas turbulent fluctuation, because their turbulence modification models cannot fully reflect the effect of particles. In this paper, a two-time-scale dissipation model of turbulence modification, developed for the two-phase velocity correlation and for the dissipation rate of gas turbulent kinetic energy, is proposed and used to simulate sudden-expansion and swirling gas-particle flows. The proposed two-time scale model gives better results than the single-time scale model. Besides, a gas turbulence augmentation model accounting for the f＇mite-size particle wake effect in the gas Reynolds stress equation is proposed. The proposed turbulence modification models are used to simulate two-phase pipe flows. It can properly predict both turbulence reduction and turbulence enhancement for a certain size of particles observed in experiments.
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| 关 键 词： | 尾涡效应 双时间尺度 耗散模型 模拟 湍流变动 颗粒 |
| 收稿时间： | 2005-03-14 |
| 修稿时间： | 2005-03-142005-08-25 |
Modeling of Fluid Turbulence Modification Using Two-time-scale Dissipation Models and Accounting for the Particle Wake Effect |
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| YUYong,ZHOULixing,WANGBaoguo.Modeling of Fluid Turbulence Modification Using Two-time-scale Dissipation Models and Accounting for the Particle Wake Effect[J].Chinese Journal of Chemical Engineering,2006,14(3):314-320. |
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| Authors: | YUYong ZHOULixing WANGBaoguo |
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| Affiliation: | a Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China ;b School of Mechanical-Electronic Engineering, Bejing Institute of Technology, Beijing 100081, China |
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| Abstract: | Presently developed two-phase turbulence models under-predict the gas turbulent fluctuation, because their turbulence modification models cannot fully reflect the effect of particles. In this paper, a two-time-scale dissipation model of turbulence modification, developed for the two-phase velocity correlation and for the dissipation rate of gas turbulent kinetic energy, is proposed and used to simulate sudden-expansion and swirling gas-particle flows. The proposed two-time scale model gives better results than the single-time scale model. Besides, a gas turbulence augmentation model accounting for the finite-size particle wake effect in the gas Reynolds stress equation is proposed. The proposed turbulence modification models are used to simulate two-phase pipe flows. It can properly predict both turbulence reduction and turbulence enhancement for a certain size of particles observed in experiments. |
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| Keywords: | turbulence modification two time scale dissipation model wake effect |
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