射流泵喉管结构优化及模型放缩机理研究  

Numerical simulation of throat structure optimization of jet pump and exploration of model contraction mechanism

作　　者：孙琬婷 李民[1] SUN Wanting;LI Min(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学机电工程学院,昆明650500

出　　处：《流体机械》2023年第11期63-70,共8页Fluid Machinery

基　　金：云南省重大科技项目(202202AG050002)。

摘　　要：针对射流泵泵送效率低下的问题,通过数值计算探究了射流泵喉管倾角和长度比之间的耦合关系,及其对泵送效率的影响。在此过程中,建立并验证了射流过程的数学模型;并使用该数学模型对16组具有不同喉管倾角和喉管长度的射流泵的泵送过程进行了理论计算。结果表明:从运动相似、动力相似和流态相似3个维度对数值计算结果和试验结果进行参数值验证,其误差仅为2.8%;在传统长度比的前提下,改变喉管倾角仅可获得3%的提升;对喉管倾角和长度比进行联动设计,泵送效率提升13%,并节省28.6%的耗材;弗劳德数和Craya-Curtet数相结合可以代替雷诺数求解不同尺度下射流泵的等效动力参数,该方法精度高达97.2%。对射流泵特征结构进行优化能够带来较高的经济效益,具有较好的工程应用前景和推广价值。For the problem of low pumping efficiency of jet pumps,coupling between the jet pump throat inclination and length ratio and its effect on pumping efficiency through numerical calculations.A mathematical model of the jet process was developed and validated in this study and used to carry out theoretical calculations of the pumping process for 16 groups of jet pumps with different throat inclinations and throat lengths.The results show that:first,the parameter values of the numerical calculation results and experimental results are verified in three dimensions:motion similarity,dynamic similarity and flow similarity,and the error is only 2.8%.Second,under the premise of the traditional length ratio,only a 3%improvement can be obtained by changing the inclination of the throat.Third,the linkage design of the inclination angle and length ratio of the throat can bring 13%improvement in pumping efficiency and save 28.6%of consumables.Fourth,the combination of the Froude number and the Craya-Curtet number can be used instead of the Reynolds number to solve the equivalent dynamic parameters of the jet pump at different scales,and the method has an accuracy of 97.2%.In conclusion,the optimisation of the characteristic structure of the jet pump can bring high economic benefits and has good engineering application prospects and promotion value.

关 键 词：放缩机理 喉管倾角 喉管长度比 CFD 

分 类 号：TH38[机械工程—机械制造及自动化]