基于CFD的液态饲料发酵罐结构设计及其传质特性研究OA

A comprehensive computational fluid dynamics(CFD)simulation model was established to investigate liquid fermentation tanks,employing an innovative approach using component transfer(tracer)methods.The model's applicability was validated through power-based verification.Focusing on the fermenter structure,the study examined the flow field dynamics under varying impeller blade lengths,blade angles,and tank diameters.The findings indicate that:① CFD numerical simulations of liquid feed fermentation tanks showed that the average deviation between the simulated power curves and experimental power curves was less than 5%,demonstrating the model's suitability under these conditions;② impeller blade lengths ranging from 10 mm to 30 mm facilitated tracer diffusion and enhanced mixing,particularly effective for denser materials;③ comparison of tracer diffu-sion and velocity fields at different blade angles revealed a significant increase in mixing effi-ciency within the 45°-75° range;④ when tank diameters ranged from 300 mm to 320 mm,the internal flow velocities were higher,with reduced material settling risks and improved mixing effectiveness.The research underscores that optimizing fermen-ter structural design can significantly enhance mixing performance,thereby improving the overall fermenta-tion efficiency of liquid feed substrates.