不同湍流模型对环形射流泵流场模拟的影响  

Influence of Turbulence Models on the Flow Field Simulation of Annular Jet Pump

作　　者：向伟宁 陈云良[1] 熊顺 张艳[1] XIANG Weining;CHEN Yunliang;XIONG Shun;ZHANG Yan(College of Water Resources and Hydropower,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学水利水电学院,四川成都610065

出　　处：《郑州大学学报（工学版）》2025年第1期113-118,125,共7页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(52276208)。

摘　　要：为准确反映环形射流泵吸入室内流体剧烈的动量交换对流场的影响,将RNG k-ε(RNG)、Realizable k-ε(RKE)、RSM、Standard k-ω(SKW)、SST k-ω(SST)这5种湍流模型和3种壁面处理方法进行组合对比计算,并开展水力实验进行验证。结果表明:不同壁面函数对环形射流泵性能和壁面压力系数的计算影响很小;相较于RNG、SKW、SST,RKE模型或RSM模型结合可扩展壁面函数(ScWF)的计算结果与实测更吻合。对比模拟流场发现:低流量比工况下不同湍流模型性能预测结果与模拟的回流区分布范围相关,模拟出来的回流区范围越大,预测的环形射流泵性能越低。基于熵产理论分析认为,环形射流泵的能量损失主要源于分布在壁面和混合剪切层的湍动熵产,高流量比工况下RSM模型计算得到的湍动熵产率偏高,是其预测性能低于RKE模型的主要原因。To reflect the influence of intense momentum exchange of the fluid in the annular jet pump suction chamber accurately,a comparison calculation using different turbulence models and wall functions was conducted,and hydraulic experiments were carried out to verify the results.The results showed that different wall functions had little effect on the performance and wall pressure coefficient calculation of the annular jet pump.Compared to the RNG k-ε(RNG),Standard k-ω(SKW),SST k-ω(SST)models,the results calculated using the Realizable k-ε(RKE)model or Reynolds stress model(RSM)combined with the scalable wall function(ScWF)was more consistent with the measurements.By comparing the simulated flow field,it was found that the performance prediction results of different turbulence models with low flow ratio conditions were related to the distribution range of the recirculation zone simulated.The larger the range of the recirculation zone simulated,the lower the predicted performance of the annular jet pump had.Based on the analysis of entropy production theory,it was believed that the energy loss of the annular jet pump was mainly caused by the turbulent entropy production distributed in the wall and the mixed shear layer.With high flow rate conditions,the high turbulent entropy production rate calculated by the RSM model was the main reason for its lower prediction performance compared to the RKE model.

关 键 词：环形射流泵 湍流模型 性能 回流区 熵产理论 

分 类 号：TH38[机械工程—机械制造及自动化]