Study of Flow Field Characteristics in a Stirred Tank Equipped with a Double Triple Narrow Blade Rotating Impeller
For a stirred tank equipped with double triple narrow blade rotating impellers under the conditions of glycerol-water solution as a flowing medium,combining computational fluid dynamics method and particle image velocimetry technology as a method,the effects of impeller parameters,including impeller installation height C1,impeller pitch C2 and rotational speed N on the internal flow field in the tank were studied.The re-sults show that when C1=0.25h(symbol h represents the liquid level in the tank),the pushing effect of the im-peller on the internal flow field in the tank was investigated.The results show that when C1=0.25h,the pushing effect of the lower blade first increases and then decreases with the addition of C1,the mixing state of the bot-tom liquid in the stirred tank is the most optimal.When C2=0.24h,the upper propeller area forms a high-speed vortex,the fluid flow between blades in the tank and the two blades cooperate is the best.When N=120 r/min,both the turbulent kinetic energy and the velocity distribution in the tank are relatively uniform,and the ener-gy consumption is lower.
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万方数据
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