【摘要】：本研究針對某型號離心泵分別開展了在清水及含沙水流體介質(zhì)的全流道數(shù)值模擬,并將其在清水介質(zhì)中的數(shù)值模擬結(jié)果與試驗(yàn)數(shù)據(jù)進(jìn)行了對比分析,主要涉及的研究內(nèi)容及成果有以下幾點(diǎn):第一,廣泛參閱了大量國內(nèi)外相關(guān)研究的參考文獻(xiàn),總結(jié)了本文的工程研究背景,闡述了國內(nèi)外水沙固液兩相流的研究現(xiàn)狀,得到了本文的研究方法、內(nèi)容以及工程意義等。第二,根據(jù)廠家提供的離心泵原始三維結(jié)構(gòu)圖和設(shè)計參數(shù),借助專業(yè)的泵與旋轉(zhuǎn)機(jī)械設(shè)計工具CFturbo,對離心泵各過流部件做三維實(shí)體模型構(gòu)建;接下來把保存好的三維模型導(dǎo)入到通用的三維建模軟件UG6.0中,對離心泵進(jìn)口延長段、葉輪、蝸殼以及出口延長段做進(jìn)一步的優(yōu)化裝配并保存;將保存好的各三維實(shí)體分別導(dǎo)入ANSYS網(wǎng)格生成模塊ICEM進(jìn)行網(wǎng)格劃分,對于不同流體域的復(fù)雜程度,選用不同的網(wǎng)格劃分方法,其中包括了六面體結(jié)構(gòu)化網(wǎng)格和四面體非機(jī)構(gòu)化網(wǎng)格,生成的網(wǎng)格質(zhì)量達(dá)到計算精度后進(jìn)行組合并保存。第三,將劃分好的離心泵各部件網(wǎng)格導(dǎo)入CFX-Pre,采用標(biāo)準(zhǔn)k-ε模型對N-S方程進(jìn)行封閉求解,借助貼體坐標(biāo)和交錯網(wǎng)格系統(tǒng)對N-S方程進(jìn)行離散,然后用SIMPLE算法求解N-S方程,對離心泵全流道進(jìn)行不同工況下清水和含沙水介質(zhì)的數(shù)值計算。第四,借助后處理模塊CFX-Post,得到了離心泵各過流部件在清水中工作的壓力分布,以及內(nèi)流場的速度分布、湍動能等,并且將數(shù)值模擬結(jié)果與試驗(yàn)數(shù)據(jù)進(jìn)行了對比論證,揭示了本研究的可靠性;得到了水沙運(yùn)行介質(zhì)中各過流部件表面的壓力分布和泥沙分布等情況,然后對離心泵各部位的磨損特性進(jìn)行了探討;針對原型泵存在的結(jié)構(gòu)問題進(jìn)行了適當(dāng)?shù)母倪M(jìn),達(dá)到了一定優(yōu)化效果。
[Abstract]:In this study, the full channel numerical simulation of a certain type of centrifugal pump was carried out in clear water and sand containing water medium, and the numerical simulation results in clear water medium were compared with the experimental data. The main research contents and results are as follows: first, a large number of domestic and foreign related references are widely consulted, the engineering research background of this paper is summarized, and the research status of water-sand solid liquid two-phase flow at home and abroad is expounded. The research method, content and engineering significance of this paper are obtained. Secondly, according to the original three-dimensional structure diagram and design parameters of centrifugal pump provided by the manufacturer, using the professional pump and rotating machinery design tool CFturbo, to build the three-dimensional solid model of each flow part of centrifugal pump; Then the saved 3D model is imported into the general 3D modeling software UG6.0, and the inlet extension section, impeller, volute and outlet extension section of centrifugal pump are further optimized and stored. The saved 3D entities are imported into the ANSYS mesh generation module (ICEM) for mesh generation, and different meshing methods are selected for the complexity of different fluid domains. It includes hexahedron structured meshes and tetrahedron non-machined meshes, which can be combined and saved after the quality of the generated meshes reach the accuracy of calculation. Thirdly, the grid of the components of the centrifugal pump is imported into CFX-Pre, to solve the N-S equation by using the standard k- 蔚 model, and the N-S equation is discretized by the body-fitted coordinates and staggered grid system. Then the N-S equation is solved by SIMPLE algorithm, and the numerical calculation of the flow channel of centrifugal pump under different working conditions is carried out. Fourthly, the pressure distribution, velocity distribution and turbulent kinetic energy of the flow field of centrifugal pump are obtained by CFX-Post, and the numerical simulation results are compared with the experimental data. The reliability of this study is revealed. The pressure distribution and sediment distribution on the surface of the flow parts in the water and sediment running medium are obtained, and then the wear characteristics of various parts of the centrifugal pump are discussed. The structure of the prototype pump is improved and the optimization effect is achieved.
【學(xué)位授予單位】：西華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TV136

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