高压水扇形喷嘴结构参数对内部流场影响的数值模拟  

Numerical Simulation of the Influence of the Structural Parameters of a High Pressure Water Sector-shaped Nozzle on Its Internal Flow Field

作　　者：张新铭[1] 罗晴[1] 洪光[1] 凌娅[1] 

机构地区：[1]重庆大学动力工程学院低品位能源利用技术及系统教育部重点实验室,重庆400030

出　　处：《热能动力工程》2012年第3期301-306,390-391,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家重点基础研究发展计划(973)基金资助项目(2011CB710701);重庆大学211工程"三期建设"基金资助项目(S-09101)

摘　　要：利用计算流体软件建立了扇形喷嘴内部流场的三维数学模型,采用标准k-ε湍流模型对其进行了数值模拟,分析了喷嘴主要结构参数对流场速度分布、压力分布和射流速度的影响。结果表明:收缩角对喷嘴内部流场,尤其是射流速度有较大的影响,以13°～15°为最佳;出口长径比对射流流态和射流速度均有一定的影响,宜在2～4之间更有利于喷嘴的射流;V形切槽的夹角对射流出口速度的影响较明显,在15°～30°时有较好的集束性,但射流速度不高,30°～45°有较好的射流速度,45°～60°可获得高的射流速度,但集束性较差。By using a computational fluid dynamics software,established was a three-dimensional mathematical model for the internal flow field of a sector-shaped nozzle and a numerical simulation was performed of the nozzle under discussion by employing the standard k-ε turbulent flow model.The influence of the main structural parameters of the nozzle on the velocity and pressure distribution as well as the jet flow speed was analyzed.It has been found that the convergence angle has a relatively large influence on the internal flow field of the nozzle,especially,the jet flow speed.The optimum convergence angle falls in a range from 13 to 15 degrees.The ratio of length to diameter at the outlet has a certain influence on both jet flow pattern and speed.When the blade height to diameter ratio is within a range from 2 to 4,it will be more favorable to the jet flow of the nozzle.The inclusive angle of the V-shaped groove has a relatively conspicuous influence on the jet flow speed at the outlet.When the inclusive angle is between 15 and 30 degrees,the nozzle displays a relatively good convergence nature but the jet flow speed is not high.When the angle is between 30 and 45 degrees,the nozzle can achieve a relatively good jet flow speed.When the angle is between 45 and 60 degrees,the nozzle can result in a high jet flow speed but a relatively poor convergence nature.

关 键 词：扇形喷嘴 结构参数 内部流场 k-ε湍流模型 集束性 

分 类 号：O351[理学—流体力学] TP69[理学—力学]