烧结多孔结构的渗透和流阻特性研究

为研究粉末冶金多孔结构的渗透性和流阻,以空气和氢气为介质进行了实验.实验显示微孔内流雷诺数低于1时,介质流量与穿过多孔结构的压降呈线性关系;当内流雷诺数高于1时,其流量与压降呈非线性特征.分析表明:传统的堆积床经验关系式将低估氢气和空气在烧结材料微孔中的流阻;相反,高估烧结多孔结构的渗透性能.并用粉末烧结结构的氢气和空气渗透实验数据拟合了多孔结构渗透率及摩擦阻力关联式. 

Research on permeability and flow resistance characteristic of sintered porous structure

To study the permeability and flow resistance of sintered porous stainless steel,a test was conducted for compressed air and gaseous hydrogen as the medium.The experimental results indicate that,there is a linear relationship between the pressure loss through the porous structure and the medium flow rate,when the flow Reynolds number in the pores is less than 1;or there is a non-linear characteristics when Reynolds number is larger than 1.This shows that:the flow friction of gaseous hydrogen or air within the pores is underestimated using the traditional correlations based on the experiments of packed beds;but the permeability of the sintered porous structure is overestimated by the Ergun's corrective correlation.The relationship between the friction resistance and permeability of hydrogen or air flowing through the porous structure was simulated with the aid of the experimental data.