对三通管道不同出口夹角湍流数值模拟研究

Numerical Simulation Study on Turbulence in T-junction Pipelines with Different Outlet Angles

三通管道具有结构简单、装卸方便、经济高效等优点,被广泛应用于水利输水系统中。文章采用FLUENT软件,对三维不同出口夹角的三通管内部流体动力学进行数值模拟研究,分析研究不同出口夹角下三通管内部流体的速度场、压强场及流线分布的变化规律,得出以下结论:管道内流体流速、压强、流线呈对称均匀分布;随着出口管段夹角的不断增加,管道内流体的速度也逐渐增大,而压强逐渐减小,入口管段与出口管段相接处形成涡旋区,且夹角越大时,此区域内流体的速度、压强、流线变化越复杂,且此区域所产生的负压达到最大。即可对三通管入口管段与出口管段相接处进行结构优化从而降低负压减小对管道的空蚀破坏,为管道的合理设计提供可靠的理论依据。

T-junction pipelines,known for their simple structure,ease of installation and disassembly,and costeffectiveness,are widely used in water conveyance systems.This paper uses FLUENT software to conduct a numerical simulation study of the fluid dynamics inside three-dimensional T-junction pipelines with different outlet angles.It analyzes the changes in velocity fields,pressure fields,and streamline distribution within the pipeline under various outlet angles.The findings include:the fluid flow speed,pressure,and streamlines in the pipeline are symmetrically and uniformly distributed;as the angle of the outlet pipe section increases,the fluid’s velocity inside the pipeline gradually increases while the pressure decreases.At the junction of the inlet and outlet pipe sections,a vortex zone is formed,and the larger the angle,the more complex the changes in velocity,pressure,and streamlines within this zone,with the negative pressure in this area reaching its maximum.Hence,structural optimization of the junction between the inlet and outlet sections of the T-junction pipeline can reduce this negative pressure and minimize cavitation damage to the pipeline,providing a reliable theoretical basis for rational pipeline design.