基于比功率的潜水推流器优化研究

Optimization of Submersible Flow Pusher Based on Specific Power

解读新发布的国家标准《潜水推流式搅拌机》(GB/T33566-2017),分别从试验和理论的角度阐述计算比功率的方法,并论证了它们的优点和局限性。以比功率为评判标准,基于CFD商用软件STAR-CCM+,研究两叶片潜水推流器在标准检验环形池里比功率随转速和叶轮直径变化的规律。结果表明,两叶片潜水推流器在标准环形池中运行时,保持叶轮直径不变,比功率均随着转速的增大先减后增,即存在经济转速点;在恒功率下,两叶片潜水推流器的比功率随着叶轮直径的增大而减小,其中在叶轮直径处于1.1~2.5m范围时,潜水推流器的比功率随着叶轮直径的增大而急剧减小,而当叶轮直径>2.5m时,潜水推流器的比功率随着叶轮直径的增大而缓慢减小。

The newly published national standard Pusher Submersible Agitator(GB/T 33566-2017)was unscrambled,and methods of calculating specific power from experimental and theoretical perspectives were elucidated and their advantages and limitations were demonstrated.The influence of variational rotational speed and impeller diameter on the specific power of a two-blade submersible flow pusher in a standard annular testing tank was investigated through taking specific power as the evaluation standard and using CFD commercial software STAR-CCM+.The results showed that the specific power decreased first and then increased with the increase of rotational speed when the two-blade submersible flow pusher with a constant diameter was operated in the standard annular tank,which indicated that there existed an economic rotational speed point.The results also showed that the specific power of the two-blade submersible flow pusher decreased with the increase of impeller diameter under constant power.When the impeller diameter changed between 1.1 m and 2.5 m,the specific power of the two-blade submersible flow pusher decreased sharply with the increase of impeller diameter,while it decreased slowly with the increase of impeller diameter when the impeller diameter was more than 2.5 m.