两相流气相湍流双时间尺度耗散模型  

A TWO TIME-SCALE DISSIPATION MODEL OF GAS TURBU- LENCE MODIFICATION IN TWO-PHASE FLOWS

作　　者：于勇[1] 周力行[1] 

机构地区：[1]清华大学工程力学系,煤的清洁燃烧国家重点实验室,北京100084

出　　处：《工程热物理学报》2003年第6期964-967,共4页Journal of Engineering Thermophysics

基　　金：国家重点基础研究专项经费资助项目子课题(No.G1999-0222-08)

摘　　要：本文提出了两相流气相湍流变动的双时间尺度耗散模型,包括气相耗散率的双时间尺度耗散模型和两相速度关联的双时间尺度各向异性耗散模型。用所提出封闭模型模拟了旋流数为0.47的气粒两相流动,发现所提出的湍流变动模型对气相脉动速度的预报结果比原有的单时间尺度模型的预报结果有明显的改进,但是颗粒尾涡的作用仍然需要进一步研究。A two time-scale dissipation model of turbulence modification, including a two time-scale dissipation model of two-phase velocity correlation and a two time-scale dissipation model of gas turbulence dissipation rate, is proposed and used to simulate swirling gas-particle flows with a swirl number of 0.47. It is found that the improved turbulence modification model gives better prediction results for the gas fluctuation velocity than the previous single-time scale model. However, the effect of particle wake effect still remains to be studied.

关 键 词：两相湍流 湍流变动 两相速度关联 

分 类 号：TK16[动力工程及工程热物理—热能工程]