金属海绵阻力特性数值计算

Numerical calculation on resistance characteristics of metal foam

采用体心立方结构和Kelvin结构重建金属海绵的胞体结构,分析比较了单相流和两相流下金属海绵内部阻力、不同切角时金属海绵内部阻力。结果表明:①体心立方结构能够达到的孔隙率e的范围为68.01%<e<98.01%;而Kelvin结构能够达到的孔隙率的范围为72.1%<e<98.7%;②油滴质量分数为9.1%、进口速度小于20 m/s时,两相流计算的压降比单相流计算的压降高约5%;③切向角为30°的Kelvin结构金属海绵与实际金属海绵的阻力特性一致性较高,能够较好地表征金属海绵的阻力特性。

The cell structure of the metal foam was reconstructed using the body-centered cubic structure and Kelvin structure,respectively,and the internal resistances of the metal foam under singlephase flow and two-phase flow at different cutting angles were analyzed and compared.The results showed that:1)the body-centered cubic structure can achieve a porosity e range of 68.01%<e<98.01%;while the Kelvin structure can achieve a porosity range of 72.1%<e<98.7%;2)the pressure drop calculated by two-phase flow was about 5%higher than that calculated by single-phase flow when the mass fraction of oil droplets was 9.1%and the inlet velocity was less than 20 m/s;3)the resistance characteristics of the Kelvin structure metal foam with a cutting angle of 30°were in high agreement with those of the actual metal foam,and can better characterize the resistance characteristics of the metal foam.