基于UG的离心泵蜗壳参数化三维造型软件二次开发的研究
发布时间：2018-10-12 10:57
【摘要】：泵是产品多样、中小批量生产、工程广泛应用的通用机械，在国民经济中占有非常重要的地位。目前国内主要是以传统的二维水力设计和CAD绘图方法为基础进行离心泵水力设计。这种传统设计方法生成的模型不能直接进行计算流体动力学(CFD)分析和有限元(FEA)分析。同时，传统的设计技术已远远不能适应当前泵设计和自动化加工制造技术。参数化三维造型方法是CAD技术继续发展和适应工业发展要求的重要技术，它具有高效性、实用性等特点。因此，从缩短泵产品设计周期、提高工作效率等方面考虑，开展泵产品参数化三维造型的研究具有重要意义。蜗壳是泵主要过流部件之一，因此，离心泵蜗壳参数化三维造型软件开发是当前开发泵产品参数化三维造型系统的关键步骤。 本论文介绍了目前常用的二次开发平台、二次开发现状以及参数化技术的理论。在此基础上，选用功能强大的三维建模软件UG为二次开发平台，深入掌握UG二次开发方法，选取UG自带的UG/OPEN API、UG/OPEN MenuScript和UG/OPEN UIStyler作为二次开发工具，进行参数化设计研究与二次开发工作。 本文主要研究了以下几个方面的问题： 1. UG二次开发技术。利用UG/OPEN API提供的函数，在VC++6.0平台上完成离心泵蜗壳设计程序的编写，并生成动态链接*.dll文件，通过UG/OPEN API的接口与UG链接；利用UG/OPEN MenuScript创建蜗壳三维参数化造型的用户菜单；利用UG/OPEN UIStyler创建蜗壳三维参数化造型的可视化对话框。 2.离心泵蜗壳参数化三维造型方法。首先用手工建模的方法建立一个离心泵蜗壳模版。蜗壳模版的设计与建立不采用标注出截面上各点坐标的方法，而是利用尺寸约束和施加几何约束实现对几何图形的全约束。然后将蜗壳模版中的主要尺寸作为变量来驱动蜗壳参数化造型模块的运行。最终实现蜗壳的三维参数化造型设计，并通过实例验证了模块的稳定性和可靠性。 3.蜗壳进口宽度对离心泵性能的影响。利用开发出的模块实现快速造型，建立4种蜗壳模型，并针对一个叶轮模型进行装配，利用FLUENT软件对4种离心泵模型在设计工况下进行数值模拟，结果发现：在蜗壳进口宽度推荐公式计算出的范围内，减小蜗壳进口宽度有助于改善离心泵性能，减小离心泵水力损失，提高离心泵的扬程，即蜗壳进口宽度存在最佳值；由于叶轮与蜗壳的干涉作用以及蜗壳非对称性结构影响，导致叶轮内各流道静压的分布不对称；由于沿液流方向存在轴向漩涡，使流体未按照恒定的液流角流动，而是类似正弦曲线波动，波动周期与叶片数有关；由叶轮出口到蜗壳进口区域，流体液流角变化的幅度随蜗壳进口宽度增加而增大，，导致过渡区域的流体冲击损失增加。
[Abstract]:Pump is a kind of universal machinery with various products, medium and small batch production and wide application of engineering, which occupies a very important position in the national economy. At present, the hydraulic design of centrifugal pump is mainly based on the traditional two-dimensional hydraulic design and CAD drawing method. The model generated by this traditional design method can not be directly analyzed by CFD (CFD) analysis and finite element (FEA) analysis. At the same time, the traditional design technology can not adapt to the current pump design and automatic manufacturing technology. Parameterized 3D modeling method is an important technology for CAD technology to continue to develop and adapt to the requirements of industrial development. It has the characteristics of high efficiency and practicability. Therefore, it is of great significance to study the parameterized 3D modeling of pump products from the aspects of shortening the design period of pump products and improving the working efficiency. Volute is one of the main overflowing parts of pump. Therefore, the development of parameterized 3D modeling software of centrifugal pump volute is the key step of developing parameterized 3D modeling system of pump product at present. This paper introduces the current secondary development platform, the status quo of secondary development and the theory of parameterized technology. On this basis, the powerful 3D modeling software UG is selected as the secondary development platform, the secondary development method of UG is thoroughly mastered, and the UG/OPEN API,UG/OPEN MenuScript and UG/OPEN UIStyler, which are included in UG, are selected as the secondary development tools. Parametric design research and secondary development work are carried out. This paper mainly studies the following aspects: 1. UG secondary development technology. Using the function provided by UG/OPEN API, the design program of volute case of centrifugal pump is written on VC 6.0 platform, and the dynamic link *. Dll file is generated, and the interface of UG/OPEN API is used to link with UG, and the user menu of 3D parameterized modeling of volute is created by UG/OPEN MenuScript. Using UG/OPEN UIStyler to create volute three-dimensional parametric modeling visualization dialog box. 2. Parametric three-dimensional modeling method for volute of centrifugal pump. Firstly, a centrifugal pump volute template is built by manual modeling. The design and establishment of volute template do not use the method of marking the coordinates of each point on the section, but use the size constraint and the geometric constraint to realize the full constraint on the geometry. Then the main dimensions of the volute template are used as variables to drive the parameterized modeling module of the volute. Finally, the 3D parameterized modeling design of the volute is realized, and the stability and reliability of the module are verified by an example. 3. The influence of the inlet width of volute on the performance of centrifugal pump. Four kinds of volute models are established by using the developed modules to realize rapid modeling, and an impeller model is assembled. The four centrifugal pump models are numerically simulated under the design conditions by using FLUENT software. The results show that reducing the inlet width of volute is helpful to improve the performance of centrifugal pump, reduce hydraulic loss of centrifugal pump and increase the lift of centrifugal pump, that is, the optimum value exists in the inlet width of volute in the range of the recommended formula for the inlet width of volute. Because of the interference between the impeller and the volute and the asymmetric structure of the volute, the distribution of static pressure in the impeller is not symmetrical, and because of the axial vortex along the direction of the liquid flow, the fluid does not flow at a constant flow angle. The fluctuation period is related to the number of blades. From the impeller outlet to the inlet region of the volute, the amplitude of fluid flow angle increases with the increase of the inlet width of the volute, resulting in the increase of the fluid impact loss in the transition region.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311
本文编号：2265859
[Abstract]:Pump is a kind of universal machinery with various products, medium and small batch production and wide application of engineering, which occupies a very important position in the national economy. At present, the hydraulic design of centrifugal pump is mainly based on the traditional two-dimensional hydraulic design and CAD drawing method. The model generated by this traditional design method can not be directly analyzed by CFD (CFD) analysis and finite element (FEA) analysis. At the same time, the traditional design technology can not adapt to the current pump design and automatic manufacturing technology. Parameterized 3D modeling method is an important technology for CAD technology to continue to develop and adapt to the requirements of industrial development. It has the characteristics of high efficiency and practicability. Therefore, it is of great significance to study the parameterized 3D modeling of pump products from the aspects of shortening the design period of pump products and improving the working efficiency. Volute is one of the main overflowing parts of pump. Therefore, the development of parameterized 3D modeling software of centrifugal pump volute is the key step of developing parameterized 3D modeling system of pump product at present. This paper introduces the current secondary development platform, the status quo of secondary development and the theory of parameterized technology. On this basis, the powerful 3D modeling software UG is selected as the secondary development platform, the secondary development method of UG is thoroughly mastered, and the UG/OPEN API,UG/OPEN MenuScript and UG/OPEN UIStyler, which are included in UG, are selected as the secondary development tools. Parametric design research and secondary development work are carried out. This paper mainly studies the following aspects: 1. UG secondary development technology. Using the function provided by UG/OPEN API, the design program of volute case of centrifugal pump is written on VC 6.0 platform, and the dynamic link *. Dll file is generated, and the interface of UG/OPEN API is used to link with UG, and the user menu of 3D parameterized modeling of volute is created by UG/OPEN MenuScript. Using UG/OPEN UIStyler to create volute three-dimensional parametric modeling visualization dialog box. 2. Parametric three-dimensional modeling method for volute of centrifugal pump. Firstly, a centrifugal pump volute template is built by manual modeling. The design and establishment of volute template do not use the method of marking the coordinates of each point on the section, but use the size constraint and the geometric constraint to realize the full constraint on the geometry. Then the main dimensions of the volute template are used as variables to drive the parameterized modeling module of the volute. Finally, the 3D parameterized modeling design of the volute is realized, and the stability and reliability of the module are verified by an example. 3. The influence of the inlet width of volute on the performance of centrifugal pump. Four kinds of volute models are established by using the developed modules to realize rapid modeling, and an impeller model is assembled. The four centrifugal pump models are numerically simulated under the design conditions by using FLUENT software. The results show that reducing the inlet width of volute is helpful to improve the performance of centrifugal pump, reduce hydraulic loss of centrifugal pump and increase the lift of centrifugal pump, that is, the optimum value exists in the inlet width of volute in the range of the recommended formula for the inlet width of volute. Because of the interference between the impeller and the volute and the asymmetric structure of the volute, the distribution of static pressure in the impeller is not symmetrical, and because of the axial vortex along the direction of the liquid flow, the fluid does not flow at a constant flow angle. The fluctuation period is related to the number of blades. From the impeller outlet to the inlet region of the volute, the amplitude of fluid flow angle increases with the increase of the inlet width of the volute, resulting in the increase of the fluid impact loss in the transition region.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311
【引证文献】
相关期刊论文 前1条
1 马继龙;;水力机械蜗壳的研究[J];中国高新技术企业;2013年18期
本文编号：2265859
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