基于Fluent的串接组合式迷宫螺旋泵数值模拟

通过Gambit完成流域的三维造型和网格划分,应用计算流体力学Fluent软件,采用多重参考系（MRF）方法,基于RNG k-ε双方程湍流模型和SIMPLEC算法,对泵内三维单相流场进行数值模拟.提出一种新型结构的迷宫螺旋泵,探讨了环槽宽度、环槽深度对新型结构泵性能的影响,确定最优设计参数,结果表明：环槽宽度、环槽深度分别为4,3 mm时泵性能最佳.通过分析模型的压力分布、速度分布、湍动能分布,研究泵内流体的流动和能量交换,对比分析2种模型泵的水力性能.分析表明：与原模型泵相比,新模型泵增压幅度和增压速率明显较大,螺旋环进口处增压速率高于螺旋环内部增压速率;转子流域内流体速度明显高于定子流域,间隙中面上存在强烈的质量和动量交换;流体增压速率与湍动强度有关,流体湍动强度越大,增压速率越大;新模型泵性能优于原模型泵,在最高工况点,扬程同比增加约3.42 m,水力效率提高约0.85%;流量大于最高工况点流量,新模型泵的效率明显高于原模型泵.

Numerical simulation of labyrinth screw pump with series combination by Fluent

Three-dimensional modeling and grid generation was done with Gambit, and 3D singlephase flow field in a pump was calculated by means of multiple reference frame （MRF） method. Renormalization group k -ε two-equation turbulence model （RNG k -ε model） and semi-implicit method for pressure-linked equations （ SIMPLEC ） algorithm with CFD code-Fluent was adopted. A new structure of labyrinth screw pump was put forward, the effect of ring slots was discussed, and the optimal design parameters were chosen. The results show that pump performance can achieve the best with the ring slot width and depth of 4 mm and 3 mm respectively. Momentum and energy transfer in the pump were studied by analyzing the static pressure, velocity and turbulent kinetic energy distribution, and pump hydraulic performances of the two models were compared. The analytical results indicate that pressurization magnitude and pressurization rate of the new model pump is larger than the original one. The fluid velocity in the rotor is obviously higher than that in the stator, and mass and momentum exchanges coexist on the clearance interface between the rotor and stator. The pressurization rate relates to the turbulent intensity, and the greater turbulent intensity is, the greater pressurizationrate can be obtained. Pump performance of the new model is better than the original one, and compared to the original pump, the new model lift head increases by approximately 3.42 m while the hydraulic efficiency increases by O. 85% under the optimum operating condition, and the new model pump efficiency is significantly higher than the original model when the flow rate is greater than that of the optimum operating condition.