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正确计算出管道交汇处流场的分布情况,对于设计合适的入口管道直径具有重要意义。以工程中常见的交叉管为例,应用计算流体力学(CFD)技术,研究管中的流体状态参数。使用目前通用的专业CFD数值计算软件FLUENT对管道内流体进行二维数值模拟,分别对算例采用一阶离散化方法、RNG湍流模型进行模拟,并对模拟的计算结果进行比较分析。结果表明,侧管管径、偏角的变化会导致流场、压力场的变化,还会导致回流现象的产生和管道出口流速的变化。
Correctly calculating the distribution of flow field at the intersection of pipelines is of great significance for designing a proper pipe diameter. Taking the cross pipe common in engineering as an example, CFD technique is applied to study the fluid state parameters in the pipe. The current general-purpose professional CFD numerical calculation software FLUENT is used to conduct two-dimensional numerical simulation of the fluid in the pipeline. The first-order discretization method and the RNG turbulence model are used respectively to simulate the calculation results and the simulation results are compared and analyzed. The results show that the change of tube diameter and declination will lead to the change of flow field and pressure field, and will also lead to the phenomenon of backflow and the change of flow velocity at the outlet of the pipe.