以喷射式浮选机射流搅拌装置结构优化为目的，选用合理的CFD数值模拟计算方案，综合考查引射性能和流场特性两个指标，对面积比、喉嘴距、喉管长度、引射管布置方式和位置进行优化计算;设计了长喉管、短喉管、导流叶片喷嘴和无导流叶片喷嘴共4组不同结构参数的射流搅拌装置试验，考查并验证了喉管长度和喷嘴内导流叶片对引射能力的影响;采用激光粒子测速仪测试了喷嘴内导流叶片对射流流束形态演变的影响。结果表明:面积比a=1.96～3.24，喉嘴距Le=0.2D_h～0.6D_h(D_h为喉管直径)、引射管采用双侧对称布置、喷嘴内设置导流叶片及喉管长度在6Dz～12Dz(Dz为喷嘴直径)，射流装置的混合效率最理想，引射管布置位置对混合效率影响较小;喷射室压力在0.145～0.160 MPa时，喷嘴内设置导流叶片，长、短喉管吸气能力平均至少提高30.73%和33.94%，引射管全开时长喉管较短喉管的吸气能力高出15%以上。结构参数对流场的影响表现在，面积比增大及引射管靠近喷嘴出口布置，喉管内射流流束的中心速度衰减越快，喉嘴距变化对中心速度的衰减影响较小;喉管长度≤6Dz时，流束中心的流核一直持续到喉管出口，引射流体和工作流体在喉管内动、质量交换不完全;喷嘴内设置导流叶片，有利于流束中心的流核区减小，原因是流束以旋转射流的形式从喷嘴喷出，形成了更有利于工作流体与引射流体动、质量交换的湍流流场;基于理想的引射性能和流场特性，面积比a=3.24、喉嘴距Le=0.6D_h、引射管采用双侧对称且正对流核区域布置方式、喷嘴内设置导流叶片及喉管长度在6Dz～12Dz为射流搅拌装置的最优结构参数，其研究结果可用于射流吸气、吸浆及混药的射流装置的结构优化中。

In order to optimize the structure of the jet stirring device of jet flotation machine,a reasonable CFD numeri- cal simulation calculation scheme was selected to examine the two characteristics of ejecting performances and flow field characteristics comprehensively. The area ratio,the length of throat tube,the layout mode and the position of ejec- tor tube were optimized. Four different structural parameters including long throat tube,short throat tube,guide vane nozzle and non-guide vane nozzle were designed for testing. The influence of the length of throat tube and the guide vane in nozzle on ejecting capability was examined and verified. The influence of the guide vanes in the nozzle on the morphological evolution of jet stream was investigated by laser particle velocimetry. The results show that the mixing ef- ficiency of jet device is the most ideal when the area ratio (a) is at 1. 96 to 3. 24,the nozzle-to-throat distance (Le ) is at 0. 2Dh to 0. 6Dh(Dh :throat tube diameter),the ejector tube is arranged on both sides,the nozzle is equipped with guide vane and the length of throat tube is at 6Dz to 12Dz(Dz :nozzle diameter). The position of the ejector tube also has little effect on that. When the injection chamber pressure is at 0. 145 to 0. 160 MPa and the guide vanes are ar- ranged in the nozzle,the suction capacity of long and short throat tube is increased by 30. 73% and 33. 94% respec- tively. The suction capacity of long throat tube is 15% higher than short one when the ejector tube is fully opened. Structural parameters also have effect on the flow field,the center velocity of throat tube attenuates faster when the area ratio is increased and the ejector tube is arranged closer to the nozzle outlet,but the change of the nozzle-to-throat dis- tance has less effect on that. When the length of throat tube is less than 6Dz ,the jet stream core continues to the outlet of throat tube,and the momentum and mass of the ejecting and working fluid cannot be completely exchanged in throat tube. When setting guide vanes in nozzle,it can promote the reduction of the region in the center of the stream. The reason is that the stream is ejected from the nozzle in the form of a rotating jet,forming a turbulent flow field that is more conducive to exchange the momentum and mass of the working and ejecting fluid. Based on ideal ejecting per- formances and flow field characteristics,when area ratio is at 3. 24,the nozzle-to-throat distance Le is at 0. 6Dh ,the e- jector tube adopts bilateral symmetrical facing to the jet stream core area,the guide vanes set in the nozzle and the length of the throat tube is at 6Dz to 12Dz ,those are optimal structural parameters of the jet stirring device.