改进CBY桨搅拌釜内单相流体流动与传热特性研究  

Study on Single Phase Fluid Flow and Heat-Transfer Performance in a Stirred Tank with an Improved CBY Hydrofoil Impeller

作　　者：车圆圆 周俊超 毕纪葛 何潮洪[1] 

机构地区：[1]化学工程联合国家重点实验室(浙江大学),浙江大学化学工程与生物工程学系,浙江杭州310027

出　　处：《高校化学工程学报》2014年第3期489-496,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金项目(21376207);浙江省自然科学基金杰出青年团队项目(R4090358);浙江省重点科技创新团队(2010R50017)

摘　　要：使用计算流体力学软件FLUENT(V6.3)对自行设计的开槽式翼型搅拌桨—CBY-H桨搅拌釜内单相体系的流动性能进行了数值研究,采用多重参考系法(MRF)和RNG k-ε湍流模型模拟搅拌釜内液体的流动情况,并将研究结果与标准的CBY桨的轴流特性进行了对比。结果表明,CBY-H桨可提高流体轴流循环性能,在桨叶下方和桨叶区流体的轴向速度比CBY桨大,高速运动的流体区域覆盖范围更广,釜内速度分布更均匀。同时CBY-H桨消耗的功率低于CBY桨,节能18.4%。论文还进行了传热实验研究,发现CBY-H桨的釜内对流传热系数略大于CBY桨,获得了传热系数Nu的关联式。Flow performance of a single-phase system in a stirred tank equipped with a grooved hydrofoil impeller （CBY-H） was studied with fluid dynamics software FLUENT （V6.3）. A multiple reference frame （MRF） method and the RNG k-εturbulence model were chosen to simulate steady liquid flow performance and results were compared with that of a standard CBY impeller. Research shows that the CBY-H impeller improves liquid axial-flow performance, and the axial velocity around and below the blade area is larger than that of the standard CBY impeller. The study using the CBY-H impeller shows that high flow-speed liquid covers a wider area with more uniform velocity distribution. Moreover, the CBY-H impeller shows 18.4%less energy consumption and the convective heat transfer coefficient of the stirred tank with the CBY-H impeller is slightly higher than that of the standard CBY impeller. The correlation between Nu and Re was also obtained.

关 键 词：翼型桨 数值模拟 轴向速度 传热实验 

分 类 号：TQ027.2[化学工程]