Influence of nozzle parameters on flow field in jet electrodeposition region
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摘要: 针对采用射流电沉积加工精度不高，沉积面积不易控制，沉积层均匀性差等问题，分析了长孔形射流喷嘴参数对沉积区域及沉积轮廓的影响。通过建立系统流体动力学模型，研究了长孔形喷嘴截面倾斜角度及喷嘴腔体长度对沉积区域流场的影响，探讨了在电场流场耦合作用下沉积层的轮廓分布状况。仿真结果表明，随着喷嘴截面倾斜角度由30°~70°不断增大，喷嘴出口处沉积液的定域范围可以缩小3 mm左右，定域性明显提高；而随着喷嘴腔体长度由40~80 mm增长，流体速度、压力和定域性的变化不大；沉积层厚度在喷嘴正下方区域最大，然后由中心向两边逐渐对称变薄。根据仿真参数加工出喷嘴并通过实验验证，实验结果与仿真结果基本吻合。Abstract: In order to solve the problems of low machining precision, difficult control of deposition area and poor uniformity of deposition layer using jet elec-trodeposition processing, the influence of long-hole jet nozzle parameters on deposition area and deposition profile was analyzed. By establishing a system hydrodynamics model, the effects of the oblique angle of the long-hole nozzle section and the length of the nozzle cavity on the flow field in the deposition area were studied, and the contour distribution of the depo-sition layer under the coupling effect of the electric field and flow field was discussed. The simulation results show that with the continuous increase of the oblique angle of the nozzle section from 30° to 70°, the localized range of the deposition liquid at the nozzle outlet can be reduced by about 3 mm, and the localization is significantly improved. With the increase of nozzle cavity length from 40 mm to 80 mm, the fluid velocity, pressure and localization did not change much. The thickness of the deposition layer is the largest in the area directly below the nozzle, and then gradually be-comes thinner symmetrically from the center to both sides. The corresponding nozzle is processed according to the simulation parameters, and the experi-mental verfication shows that the experimental results are basically con-sistent with the simulation results.
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Key words:
- jet electrodeposition /
- long-hole nozzle /
- fluid dynamics /
- localization
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