大口径多级消能固定锥形阀的设计优化与验证
发布时间：2018-11-16 17:50
【摘要】：大口径多级消能固定锥形阀与普通固定锥形阀的区别是阀门出口带有一个特殊设计的导流罩,同时大口径多级消能固定锥形阀进行了多项创新设计,具有普通固定锥形阀的所有特点,除了可用于普通固定锥形阀的对空消能或者淹没消能场合外,还可应用于高压差及管中消能的场合。目前对大口径多级消能固定锥形阀结构优化设计的研究很少,本文利用结构优化设计理论和有限元分析方法对该类产品进行优化研究,能够提高产品的可靠性,降低制造的成本。通过对该类产品进行CFD数值模拟计算,计算其流量系数,了解其消能效果。本文研究内容及结论主要体现在以下几方面:(1)对固定锥形阀的结构和原理进行分析。结合某电站项目,分析其使用工况,提出了一种新的多级消能导流罩结构,应用于管中消能场合。(2)模拟强度试验和密封试验工况,通过SolidWorks Simulation软件对该电站DN2400、PN16固定锥形阀初设方案进行分析和优化,使产品达到了轻量化的要求。采用应力应变及位移试验对生产的产品实物进行应力评估和位移测量,将实测结果与有限元分析计算数值进行比较,结果表明实测值与有限元计算值基本一致,优化设计的结果满足设计要求,从而验证了有限元计算方法的准确性,可用于设计指导。(3)通过对三种固定锥形阀及阀后消能结构的CFD数值分析比较,选出较优的阀后消能结构。(4)提出了模型试验的方法,并按照相似性理论制造缩小比例的DN250、PN16固定锥形阀及阀后消能结构模型,完成模拟工况下的阀门消能试验,将试验测试结果换算出的流量系数、消能率与通过ANSYS Fluent软件数值分析计算出的流量系数、消能率进行对比分析,证明CFD计算方法的原理及相关公式的正确性。本文通过对大口径多级消能固定锥形阀设计优化研究,建立了一套固定锥形阀的设计优化方法、流量系数、应力应变和位移的计算分析方法,同时建立了试验模型并进行了试验,将试验数据与数值分析值进行对比分析,得出了一些有价值的结论,为国内大型水利工程中大口径固定锥形阀的设计和研究提供了一套可行的方法,可缩短设计周期,降低制造成本,本研究对固定锥形阀的设计有深刻的指导意义。
[Abstract]:The difference between large caliber multistage fixed cone valve and common fixed cone valve is that the valve outlet has a specially designed flow guide cover, and at the same time, the large caliber multi stage energy dissipation fixed cone valve has carried out many innovative designs. It has all the characteristics of common fixed conical valve. It can be used not only for air energy dissipation or submerged energy dissipation of general fixed cone valve, but also for high pressure difference and energy dissipation in pipe. At present, there is little research on the structural optimization design of large caliber multi-stage energy dissipation fixed conical valve. In this paper, the structural optimization design theory and finite element analysis method are used to optimize this kind of products, which can improve the reliability of the products. Reduce the cost of manufacturing. Through the CFD numerical simulation of this kind of products, the flow coefficient is calculated and the energy dissipation effect is understood. The main contents and conclusions of this paper are as follows: (1) the structure and principle of the fixed conical valve are analyzed. In this paper, a new multistage energy dissipation guide cover structure is put forward based on the analysis of the operating conditions of a power station project. (2) the strength test and sealing test condition are simulated, and the DN2400, of the power station is analyzed by SolidWorks Simulation software. The initial design of PN16 fixed conical valve was analyzed and optimized to meet the requirement of lightweight. The stress, strain and displacement tests are used to evaluate and measure the stress and displacement of the products. The measured results are compared with the calculated values of finite element analysis. The results show that the measured values are in good agreement with the calculated values of the finite element method. The results of the optimization design meet the design requirements, which verify the accuracy of the finite element method and can be used to guide the design. (3) through the CFD numerical analysis and comparison of three fixed cone valves and their rear energy dissipation structures, (4) the method of model test is put forward, and according to the similarity theory, the DN250,PN16 fixed cone valve and the back energy dissipation structure model are manufactured to complete the valve energy dissipation test under simulated working condition. The flow coefficient, the energy dissipation rate and the flow coefficient calculated by the numerical analysis of the ANSYS Fluent software are compared and analyzed. The principle of the CFD calculation method and the relevant formula are proved to be correct. In this paper, by studying the design optimization of large caliber multistage fixed cone valve, a set of design optimization method, flow coefficient, stress strain and displacement analysis method of fixed cone valve are established. At the same time, the experimental model is established and the experimental data are compared with the numerical analysis values, and some valuable conclusions are obtained. This paper provides a set of feasible methods for the design and research of large caliber fixed conical valve in large water conservancy projects in China, which can shorten the design period and reduce the manufacturing cost. This study has a profound guiding significance for the design of fixed tapered valve.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH134
本文编号：2336207
[Abstract]:The difference between large caliber multistage fixed cone valve and common fixed cone valve is that the valve outlet has a specially designed flow guide cover, and at the same time, the large caliber multi stage energy dissipation fixed cone valve has carried out many innovative designs. It has all the characteristics of common fixed conical valve. It can be used not only for air energy dissipation or submerged energy dissipation of general fixed cone valve, but also for high pressure difference and energy dissipation in pipe. At present, there is little research on the structural optimization design of large caliber multi-stage energy dissipation fixed conical valve. In this paper, the structural optimization design theory and finite element analysis method are used to optimize this kind of products, which can improve the reliability of the products. Reduce the cost of manufacturing. Through the CFD numerical simulation of this kind of products, the flow coefficient is calculated and the energy dissipation effect is understood. The main contents and conclusions of this paper are as follows: (1) the structure and principle of the fixed conical valve are analyzed. In this paper, a new multistage energy dissipation guide cover structure is put forward based on the analysis of the operating conditions of a power station project. (2) the strength test and sealing test condition are simulated, and the DN2400, of the power station is analyzed by SolidWorks Simulation software. The initial design of PN16 fixed conical valve was analyzed and optimized to meet the requirement of lightweight. The stress, strain and displacement tests are used to evaluate and measure the stress and displacement of the products. The measured results are compared with the calculated values of finite element analysis. The results show that the measured values are in good agreement with the calculated values of the finite element method. The results of the optimization design meet the design requirements, which verify the accuracy of the finite element method and can be used to guide the design. (3) through the CFD numerical analysis and comparison of three fixed cone valves and their rear energy dissipation structures, (4) the method of model test is put forward, and according to the similarity theory, the DN250,PN16 fixed cone valve and the back energy dissipation structure model are manufactured to complete the valve energy dissipation test under simulated working condition. The flow coefficient, the energy dissipation rate and the flow coefficient calculated by the numerical analysis of the ANSYS Fluent software are compared and analyzed. The principle of the CFD calculation method and the relevant formula are proved to be correct. In this paper, by studying the design optimization of large caliber multistage fixed cone valve, a set of design optimization method, flow coefficient, stress strain and displacement analysis method of fixed cone valve are established. At the same time, the experimental model is established and the experimental data are compared with the numerical analysis values, and some valuable conclusions are obtained. This paper provides a set of feasible methods for the design and research of large caliber fixed conical valve in large water conservancy projects in China, which can shorten the design period and reduce the manufacturing cost. This study has a profound guiding significance for the design of fixed tapered valve.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH134
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