液力惯容器螺旋管内单相流压降数值模拟

Numerical simulation of pressure drop of single-phase flow in helical tubes of hydraulic inerter

螺旋管内单相流压降是螺旋管式液力惯容器精细化设计中的重要参数。在Fluent中采用Realizable k-ε湍流模型对10种结构特性的螺旋圆管内单相流动进行数值模拟。数值模拟结果与已有的螺旋管内单相流准则关系式进行比较,验证了数值计算的正确性。对模拟结果数据集与准则关系式计算结果数据集进行了拟合,得到了液力惯容器螺旋管内单相流沿流道的压力场和速度场等流体特性以及雷诺数、曲率比和扭率对液力惯容器螺旋管内单相流压降的影响。结果表明:Murakami准则关系式与数值模拟结果数据集拟合最佳,Ito次之;压力核心区和速度核心区均位于管外侧,压降随雷诺数和曲率的增大而增大,随扭率的增大而减小。研究结论可为液力惯容器的结构参数设计提供理论依据。

Pressure drop of single-phase flow in helical tube is an essential parameter in the fine design of hydraulic inerter with helical tube.The realizable k-εturbulence model was used to simulate the single-phase flow in 10 kinds of helical tubes with different structural characteristic in Fluent.Calculated results were compared to the existing empirical formulas to study the validity of the numerical results.The data set of numerical simulation results was fitted with the data set of the available empirical correlation calculation results.The flow characteristics of single-phase flow along the flow channel such as pressure and velocity field and the effect of Reynolds number,curvature and torsion on the pressure drop of single-phase flow in helical tubes of hydraulic inerter were obtained.The results showed that the first and second best fit of the simulated data to these empirical correlations were those proposed by Murakami and Ito respectively.The pressure core region and velocity core region were located outside the tube.The pressure drop increased with the increase of Reynolds number and curvature,and decreased with the increase of torsion.The research conclusions provide an important theoretical basis for design of structural parameters of hydraulic inerter.