弥散型透气砖阻力系数的测试与分析

Measurement and analysis of resistance coefficient of permeable brick

根据Forchheimer’s定律，测量了通过弥散型透气砖的吹气量和压降，并引入多孔介质模型描述气体在弥散型透气砖内的流动。借助CFD软件模拟计算了气体在透气砖内的流动状况，确定了弥散型透气砖的阻力系数。采用物理测试与数值模拟相结合的方法，研究透气砖的显气孔率和平均孔径对阻力系数的影响。结果表明，弥散型透气砖的黏性阻力系数远大于惯性阻力系数，在显气孔率为23％～28％的范围内，随着透气砖的显气孔率和平均孔径的增大，其阻力系数显著降低。

The gas flow rate and pressure drop through the permeable brick were measured according to Forchheimer＇s Law. Porous media model was adopted for describing the gas flow through the permeable brick, and the flow characteristics were simulated by CFD software. The resistance coefficient was determined in light of the measurement and simulation. The relation between the microstructure and the resistance coefficient was studied by physical and mathematical modeling. The results show that the viscosity resistance coefficient decreases when the porosity and average pore diameter increase, while the inertia resistance coefficient has no obvious change.