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通过定义局部分离度,来定量表征喷射器内液-液湍流微观混合规律。其定义式为:(实验所得H~+浓度-模拟所得H~+浓度)/模拟所得H~+浓度。选用酸碱反应体系,利用PLIF技术得到沿喷射器轴线的H~+浓度;采用Fluent软件,利用Standard k-ε模型,模拟获得相同操作条件下的H~+浓度变化趋势。得到不同操作条件下,分离度沿喷射器轴线的变化,结果表明:(1)引流速度不变,喷嘴速度越大,两流体越容易达到微观尺度的均匀混合;(2)喷嘴速度不变,引流速度越大,两流体反而不容易达到微观尺度上的均匀混合;(3)速度比一定的情况下,喷嘴速度越大,越有利于流体的微观混合。
By defining the local resolution, we quantitatively characterize the micro-mixing law of liquid-liquid turbulence in the ejector. Its definition is: (experimental H ~ + concentration - simulated H ~ + concentration) / simulated H ~ + concentration. The concentration of H ~ + along the axis of the injector was obtained by using PLIF technique with acid-base reaction system. By using Fluent software and Standard k-ε model, the change trend of H ~ + concentration under the same operating conditions was simulated. The results show that: (1) the drainage velocity is constant, the greater the nozzle velocity is, the easier it is for the two fluids to achieve uniform mixing at the microscopic scale; (2) The constant nozzle velocity, The greater the drainage speed, the two fluids are not easy to achieve uniform mixing on the microscopic scale; (3) The speed ratio under certain circumstances, the greater the nozzle speed, the more conducive to the micro-fluid mixing.