一种新型电动球阀的数值模拟与实验研究

【作者】 黎焱；

【导师】 沈新荣；

【作者基本信息】 浙江大学 ， 流体机械及工程， 2007， 硕士

【摘要】 本文创新设计了一种具有等百分流量调节特性的新型电动球阀产品几何模型，并对这类调节球阀产品模型在不同阀芯开度下的三维湍流流动进行了大量的数值模拟。数值模拟采用RNGκ-ε湍流模型和非结构化网格的SIMPLE计算方法，对所设计的调节球阀产品模型在不同阀芯开度下的数值计算，获得了阀门标称流量系数(K_VS)与阀门相对开度θ间的关系，即阀门流量调节特性。通过对数值结果的分析及阀芯型线优化后，得到了一种在普通电动两通球阀一端直接装配流孔实现调节型特性的电动球阀，该球阀具有十分理想的等百分比流量特性。为了修正调节球阀阀芯通流孔的计算出流系数，论文还专门对标准孔板进行了三维湍流流动的数值模拟。论文还专门设计制作了阀门特性试验装置，对设计得到的调节球阀产品模型进行实验研究，获得了阀门实验标称流量系数(K_VS)与实验相对开度（θ）的调节特性关系。同时，为了比较本论文设计球阀与目前调节球阀通用产品的流量特性，本文同时对同通径规格的两种某著名进口品牌的电动调节球阀产品进行了实验测试。数值计算和实验研究对比结果表明：利用CFD技术进行调节阀模型的内流优化设计和预测分析方法是行之有效的，论文采用流体力学数值模拟和实验研究相结合的研发设计方法，得到了一种具有理想等百分比调节特性的新型调节球阀，设计模型的流量特性符合初始的等百分比流量特性公式，这种新型调节球阀产品完全可以应用到工程实际当中。更多还原

【Abstract】 A sort of ball-valve with control character of identical percentage weredesigned innovatively. And a great amount of numerical simulation ofthree-dimensional turbulent flow under different valve-trim-part position wereperformed on these models. The RNG k-εturbulence model and SIMPLEscheme based on unstructured grid system was adopted in numericalsimulation. The relations between nominal flow coefficient(K_VS) and relativevalve opening angle（θ） were obtained by simulating the turbulent flow underdifferent valve opening angle, that is the flow character of the valve. Byanalyzing the numerical simulation results and optimizing the molded line ofvalve-trim-part, we got a sort of control ball-valve, which is constituted bynormal ball valve and valve plate orifice, and the valve have ideal flowcharacter of identical percentage.Aiming to correct the outflow coefficient of valve-trim-part orifice, thenumerical simulation of the three-dimensional turbulent flow was carried out onthe standard pore plate.In experimental investigation, we specially designed a set equipped withhigh sensitive sampled-data system, and also got the relations betweenexperimental nominal flow coefficient(K_VS) and relative valve opening（θ）.Meanwhile, we also study the flow control character of several product with thesame function on the experimental test-bed.The numerical and experimental results show that: It’s feasible to designand optimize the control valve by three-dimensional CFD numerical simulation;Moreover, the new sort of control ball-valve designed based on numericalsimulation and experimental investigation have ideal flow control character andthe character curve of the valve is coincident with the equation of flowcharacter we adopted. This new sort of control valve can be applied to engineering.更多还原