【摘要】：泵是產(chǎn)品多樣、中小批量生產(chǎn)、工程廣泛應(yīng)用的通用機(jī)械，在國(guó)民經(jīng)濟(jì)中占有非常重要的地位。目前國(guó)內(nèi)主要是以傳統(tǒng)的二維水力設(shè)計(jì)和CAD繪圖方法為基礎(chǔ)進(jìn)行離心泵水力設(shè)計(jì)。這種傳統(tǒng)設(shè)計(jì)方法生成的模型不能直接進(jìn)行計(jì)算流體動(dòng)力學(xué)(CFD)分析和有限元(FEA)分析。同時(shí)，傳統(tǒng)的設(shè)計(jì)技術(shù)已遠(yuǎn)遠(yuǎn)不能適應(yīng)當(dāng)前泵設(shè)計(jì)和自動(dòng)化加工制造技術(shù)。參數(shù)化三維造型方法是CAD技術(shù)繼續(xù)發(fā)展和適應(yīng)工業(yè)發(fā)展要求的重要技術(shù)，它具有高效性、實(shí)用性等特點(diǎn)。因此，從縮短泵產(chǎn)品設(shè)計(jì)周期、提高工作效率等方面考慮，開展泵產(chǎn)品參數(shù)化三維造型的研究具有重要意義。蝸殼是泵主要過流部件之一，因此，離心泵蝸殼參數(shù)化三維造型軟件開發(fā)是當(dāng)前開發(fā)泵產(chǎn)品參數(shù)化三維造型系統(tǒng)的關(guān)鍵步驟。 本論文介紹了目前常用的二次開發(fā)平臺(tái)、二次開發(fā)現(xiàn)狀以及參數(shù)化技術(shù)的理論。在此基礎(chǔ)上，選用功能強(qiáng)大的三維建模軟件UG為二次開發(fā)平臺(tái)，深入掌握UG二次開發(fā)方法，選取UG自帶的UG/OPEN API、UG/OPEN MenuScript和UG/OPEN UIStyler作為二次開發(fā)工具，進(jìn)行參數(shù)化設(shè)計(jì)研究與二次開發(fā)工作。 本文主要研究了以下幾個(gè)方面的問題： 1. UG二次開發(fā)技術(shù)。利用UG/OPEN API提供的函數(shù)，在VC++6.0平臺(tái)上完成離心泵蝸殼設(shè)計(jì)程序的編寫，并生成動(dòng)態(tài)鏈接*.dll文件，通過UG/OPEN API的接口與UG鏈接；利用UG/OPEN MenuScript創(chuàng)建蝸殼三維參數(shù)化造型的用戶菜單；利用UG/OPEN UIStyler創(chuàng)建蝸殼三維參數(shù)化造型的可視化對(duì)話框。 2.離心泵蝸殼參數(shù)化三維造型方法。首先用手工建模的方法建立一個(gè)離心泵蝸殼模版。蝸殼模版的設(shè)計(jì)與建立不采用標(biāo)注出截面上各點(diǎn)坐標(biāo)的方法，而是利用尺寸約束和施加幾何約束實(shí)現(xiàn)對(duì)幾何圖形的全約束。然后將蝸殼模版中的主要尺寸作為變量來(lái)驅(qū)動(dòng)蝸殼參數(shù)化造型模塊的運(yùn)行。最終實(shí)現(xiàn)蝸殼的三維參數(shù)化造型設(shè)計(jì)，并通過實(shí)例驗(yàn)證了模塊的穩(wěn)定性和可靠性。 3.蝸殼進(jìn)口寬度對(duì)離心泵性能的影響。利用開發(fā)出的模塊實(shí)現(xiàn)快速造型，建立4種蝸殼模型，并針對(duì)一個(gè)葉輪模型進(jìn)行裝配，利用FLUENT軟件對(duì)4種離心泵模型在設(shè)計(jì)工況下進(jìn)行數(shù)值模擬，結(jié)果發(fā)現(xiàn)：在蝸殼進(jìn)口寬度推薦公式計(jì)算出的范圍內(nèi)，減小蝸殼進(jìn)口寬度有助于改善離心泵性能，減小離心泵水力損失，提高離心泵的揚(yáng)程，即蝸殼進(jìn)口寬度存在最佳值；由于葉輪與蝸殼的干涉作用以及蝸殼非對(duì)稱性結(jié)構(gòu)影響，導(dǎo)致葉輪內(nèi)各流道靜壓的分布不對(duì)稱；由于沿液流方向存在軸向漩渦，使流體未按照恒定的液流角流動(dòng)，而是類似正弦曲線波動(dòng)，波動(dòng)周期與葉片數(shù)有關(guān)；由葉輪出口到蝸殼進(jìn)口區(qū)域，流體液流角變化的幅度隨蝸殼進(jìn)口寬度增加而增大，，導(dǎo)致過渡區(qū)域的流體沖擊損失增加。
[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.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH311

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 馬繼龍;;水力機(jī)械蝸殼的研究[J];中國(guó)高新技術(shù)企業(yè);2013年18期

本文編號(hào)：2265859