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本文从微观与宏观两个方面考察了喷射器的混合性能。利用CFD模拟软件Fluent 6.2求解了混合模型方程、流体流动方程及k-ε湍流模型方程,对不同结构、不同工况下的喷射器进行了考察,结果表明:1)在喷射器结构一定的情况下,喷嘴速度和引射流体速度比越大混合效果越好;2)在喷射器结构、喷嘴速度与引射流体速度比为定值的情况下,其绝对速度越小混合效果越好;3)在喷射器速度为定值的情况下,混合段直径与喷嘴直径比越小混合效果越好,二者之间存在着线性关系;4)在喷射器速度、混合段直径与喷嘴直径比为定值的情况下,其绝对直径越小混合效果越好,且二者之间存在着线性关系;5)在多数情况下,微观混合速度要慢于宏观混合,微观混合才是喷射器内混合过程的控制步骤。
This article examines the mixing performance of the ejector from both micro and macro aspects. The mixed model equation, fluid flow equation and k-ε turbulence model equation are solved by the CFD simulation software Fluent 6.2. The ejector under different conditions and conditions is investigated. The results show that: 1) In the case of a certain injector structure , The better the mixing speed is between the nozzle speed and the fluid velocity of injection fluid; 2) The smaller the absolute velocity is, the better the mixing effect is when the ejector structure, nozzle speed and ejecting fluid velocity ratio are fixed value; 3 ) In the case of the injector speed is fixed, the mixing section diameter and the nozzle diameter ratio of the smaller the better the mixing effect, there is a linear relationship between the two; 4) at the injector speed, mixing section diameter and nozzle diameter ratio In the case of constant value, the smaller the absolute diameter, the better the mixing effect, and there is a linear relationship between the two. 5) In most cases, the microscopic mixing speed is slower than the macro mixing, and the micro mixing is the mixing within the injector Process control steps.