设计了一种梯形截面的新型螺旋型湍流促进器，分析了速度、湍动能、湍流耗散率、压力、壁面剪切力等物理量的指标变化以及在流场中的分布状态，结合数值模拟分析法探索螺旋型湍流促进器强化传质过程的作用机理，并与传统半圆形截面螺旋型湍流促进器的流体动力学性能和能耗进行了对比。研究表明，梯形截面螺旋型湍流促进器流场的最大速度为1.44 m/s，湍动能平均值为0.023 K，壁面剪切力平均值为9.55 Pa，轴向压力降与壁面剪切力的比值为165；半圆形截面螺旋型湍流促进器流场的最大速度为1.17 m/s，湍动能平均值为0.02 K，壁面剪切力平均值为7.35 Pa，轴向压力降与壁面剪切力的比值为155；梯形截面的螺旋型湍流促进器流场的流体动力学性能要优于半圆形截面螺旋型湍流促进器，且压力降与壁面剪切力相比增加幅度较小，即相对阻力更小，在满足强化传质要求的同时消耗更少的能量。

A novel spiral-type turbulence enhancer with a trapezoidal section is designed and prepared.Changes of velocity, turbulent kinetic energy, turbulence dissipation rate, pressure and wall shear force for this enhancer are analyzed, and their distribution states in the flow field are also analyzed.Combining with numerical simulation analysis method, the mechanism for spiral turbulence enhancers to enhance mass transfer process is explored.The hydrodynamic performance and energy consumption of this novel enhancer is compared with that of a spiral turbulence enhancer with a traditional semicircle section.From the simulation results, it can be concluded that in the flow field using a trapezoidal section spiral turbulence enhancer, the maximum velocity can achieve 1.44 m·s^-1, the average turbulent kinetic energy 0.023 K, the average wall shear force 9.55 Pa and the ratio of axial pressure drop to wall shear force is 165.In the flow field in the spiral turbulence promoter with a semicircular section, the maximum velocity can reach 1.17 m·s^-1, the average turbulent energy reaching 0.02 K, the average wall shear force 7.35 Pa.and the ratio of pressure drop to wall shear force 155.It is verified that the flow field using a trapezoidal cross-section spiral turbulence enhancer has a better hydrodynamic performance than that using semicircle section spiral turbulence enhancer.

郗元(1987-),男,博士,工程师,研究方向为流体机械装备,xiyuan@dlut.edu.cn。