【摘要】 通过粒子图像测速技术（PIV）对三叶后掠-HEDT组合桨搅拌槽内的流场进行了实验研究，考察了该组合桨的桨间距和转速的变化对搅拌槽内流场特性的影响。研究结果表明：当桨间距C₂=0.35T时（T为搅拌槽直径），槽内的流场速度分布更加均匀，两桨之间湍动能更大，流体搅拌更加充分，槽内的流体流动效果最好。研究不同偏角下的尾涡时，发现HEDT桨形成的尾涡不断生成和消失，在槽内形成脉动速度，增加了槽内流体的湍动强度，混合效果得到加强。当转速N=120 r·min^-1时，HEDT桨上部低速区消失，同时槽壁处湍动能增大，此时的混合效果最好。更多还原

【Abstract】 By means of particle image velocimetry（PIV） to experimentally study the flow field in the stirred tank of PFAUDLER-HEDT combined impeller, and the effects of the impeller pitch and stirring speed on the characteristics of the flow field in the stirred tank were investigated. It provides a reference for the rational application of the stirred tank of PFAUDLERHEDT combined impeller in practical engineering. The results show that when the impeller pitch C₂=0. 35T, the velocity distribution of the flow field in the stirred tank is more uniform, the turbulent kinetic energy between the two impeller is larger, the fluid agitation is more sufficient, and the fluid flow effect in the tank is the best. When the trailing vortices under different deflection angles were studied, it is found that the trailing vortices formed by HEDT paddle continuously generate and disappear, which will form pulsation velocity in the tank and increase the turbulent strength of the fluid in the tank, and the mixing effect will strengthen. When the stirring speed N=120 r · min^-1, the low speed zone of the upper part of the HEDT propeller disappears, and the turbulent kinetic energy of the tank wall increases, and the mixing effect is the best. The research results provide further reference for the engineering application and optimization of the combined impeller.更多还原