Effect of Impeller Pitch on the Flow Characteristics of Punched and Four-bladed Combination Impellers in a Stirred Tank
Based on the large eddy simulation method in computational fluid dynamics,the flow characteristics in a stirred tank with the punched and four-bladed combination impellers at different impeller pitches C2 were simulated and analyzed,and the simulation results were compared with particle image velocimetry experiments.The research results show that the impeller pitch has a significant effect on the connecting flow between two blades and the overall mixing effect.When C2=0.24H(H is the height of the stirred tank),the connecting flow between the two blades is relatively stable,but the flow in the upper part of the stirred tank is poor.When the impeller pitch increases to C2=0.29H,the connecting flow between the two impellers in the stirred tank forms a S-shape and the mixing ability of the liquid is stronger.As the impeller pitch increases to C2=0.34H,the connecting flow between the two impellers is weak and the flow pattern inside the stirred tank is divided into two large local mixing regions based on the position of the impellers.
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