An investigation into characteristics of turbulence within big-cavity porous media

作者：Chen Zhong Shan^*; Xie Mao Zhao; Liu Hong Sheng; Jia Ming; Liu Hong

来源：Journal of Engineering Thermophysics, 2013, 34(1): 189-193.

• Dissipation rates
• Entrance effects
• Experimental datum
• Geometric models
• Geometric parameter
• Homogeneous network
• Turbulent kinetic energy

A new 3-D homogeneous network model is constructed for simulation of combustion in the big-cavity porous media. The relationship between the pressure gradient and the Darcean velocity was investigated in the simulation, which showed a good agreement with experimental data. Compared with the porosity, the effect of the pore size, i.e. the permeability, on the pressure gradient is more significant. The entrance effect is only limited within the 2 to 3 cell units from the entrance, and the geometric parameters and Darcean velocity play little role in the entrance effect. The existence of porous media suppresses the development of turbulent kinetic energy, which decays dramatically within the region affected by the entrance effect, then changes moderately and comes to a balance with its dissipation rate at the end.

• 出版日期2013