Different turbulence structure of gas-particle two-phase flow with and without swirling flow

作者：Liu Yang^*; Zhou Li Xing; Xu Chun Xiao

来源：Journal of Engineering Thermophysics, 2011, 32(1): 63-66.

• Coherent structure
• Combustion pollutant
• Eddy structures
• Experimental data
• Experimental studies
• Fuel-air mixing
• Gas-particle flows
• Gas-particle two-phase flow
• Gas-particle two-phase flows
• Gasphase
• Mean flow
• Mean velocities
• Particle phase
• Root mean squares
• Second orders
• Subgrid-scale stress models
• Sudden-expansion combustion chamber
• Time-averaged
• Turbulence structures
• Two-fluid
• Two-phase turbulence

Detailed gas-particle two-phase turbulence structure with and without swirling flows is very important to control fuel-air mixing, flame stabling and combustion pollutant producing in combustion chamber. Lot of RANS and experimental studies had been carried out for time-averaged mean flow flied and turbulence behavior of two-phase flow. But, detailed instantaneous two-phase turbulence structure could not be observed. A second-order-moment subgrid-scale stress model (SOM-SGS) based on two-fluid approach is proposed to simulate numerically for coaxial sudden-expansion gas-particle flows with and without swirling flows using large eddy simulation (LES). LES statistical results of two-phase time-averaged mean velocity and root-mean-square (rms) velocity are validated by experimental data. The different detailed turbulence structures are obtained. With swirling flow, no typical coherent structure is observed and lots of re-circulating eddy are found. Without swirling flow, typical coherent structure of gas phase is found. Furthermore, eddy structure of particle phase flows is not obvious for both swirling and not swirling flow.

• 出版日期2011