本文關(guān)鍵詞： 混流泵葉輪 集成 數(shù)值模擬 自動(dòng)優(yōu)化　出處：《揚(yáng)州大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：葉輪作為混流泵的核心部件,其性能的好壞直接關(guān)系到混流泵運(yùn)行的效率、穩(wěn)定性及汽蝕性能。在廣泛使用計(jì)算機(jī)和計(jì)算流體動(dòng)力學(xué)(CFD)技術(shù)進(jìn)行混流泵計(jì)算機(jī)輔助設(shè)計(jì)(CAD)及性能預(yù)測(cè)的基礎(chǔ)上,開(kāi)展混流泵葉輪自動(dòng)優(yōu)化設(shè)計(jì)研究,能夠有效集成CAD和CFD技術(shù)實(shí)現(xiàn)混流泵葉輪真正意義上的優(yōu)化設(shè)計(jì),可進(jìn)一步提高混流泵整體性能,降低設(shè)計(jì)成本,縮短研發(fā)周期。 本文基于多學(xué)科優(yōu)化設(shè)計(jì)軟件iSIGHT-FD,將混流泵葉輪CAD、CFD流場(chǎng)計(jì)算與數(shù)值優(yōu)化技術(shù)有機(jī)聯(lián)系起來(lái),構(gòu)建混流泵葉輪自動(dòng)優(yōu)化設(shè)計(jì)平臺(tái)。該平臺(tái)由數(shù)學(xué)過(guò)程控制葉片設(shè)計(jì)的修改方向,以現(xiàn)有的混流泵葉輪模型為對(duì)象,進(jìn)行自動(dòng)優(yōu)化設(shè)計(jì)。運(yùn)用CFX軟件對(duì)混流泵模型葉輪內(nèi)部三維流場(chǎng)進(jìn)行數(shù)值模擬,計(jì)算其外特性性能參數(shù)。在分析CFX軟件數(shù)據(jù)輸入、輸出方法的基礎(chǔ)上,確定了前處理數(shù)據(jù)輸入文件的格式和后處理數(shù)據(jù)輸出文件的格式；選取葉尖葉柵稠密度、葉根葉柵稠密度倍數(shù)、葉片展向無(wú)因次負(fù)荷系數(shù)A/B和C/B共四個(gè)優(yōu)化設(shè)計(jì)參數(shù),對(duì)葉片各斷面翼型長(zhǎng)度和安放角進(jìn)行控制,通過(guò)調(diào)整混流泵葉輪CAD程序,實(shí)現(xiàn)葉輪葉片的參數(shù)化造型。通過(guò)對(duì)優(yōu)化參數(shù)極限值葉輪造型效果和網(wǎng)格剖分的分析,驗(yàn)證優(yōu)化參數(shù)搜索空間的有效性。最終采用iSIGHT-FD軟件平臺(tái),構(gòu)建葉片參數(shù)化造型、網(wǎng)格劃分、數(shù)值模擬和NLPQL優(yōu)化算法的混流泵葉輪自動(dòng)優(yōu)化設(shè)計(jì)流程,對(duì)初始葉片在設(shè)計(jì)工況下進(jìn)行了自動(dòng)優(yōu)化設(shè)計(jì) 通過(guò)對(duì)優(yōu)化前后的葉輪性能進(jìn)行對(duì)比分析,葉輪經(jīng)優(yōu)化后性能相對(duì)有所提高,表明本文采用的自動(dòng)優(yōu)化設(shè)計(jì)方法是有效并可行的。
[Abstract]:Impeller is the core component of mixed flow pump, and its performance is directly related to the efficiency of mixed flow pump. Stability and cavitation performance. On the basis of computer aided design (CAD) and performance prediction based on computer and computational fluid dynamics (CFDs) technology, the automatic optimization design of impeller of mixed-flow pump is studied. It can effectively integrate CAD and CFD technology to realize the real optimization design of the impeller of the mixed-flow pump. It can further improve the overall performance of the mixed-flow pump, reduce the design cost and shorten the research and development period. In this paper, based on the software iSIGHT-FDD, the CFD flow field calculation of the impeller of the mixed flow pump is organically connected with the numerical optimization technology, and a platform for the automatic optimization design of the impeller of the mixed-flow pump is constructed. The modification direction of the blade design is controlled by the mathematical process. Taking the existing impeller model of the mixed flow pump as the object, the automatic optimization design is carried out. The three-dimensional flow field inside the impeller of the mixed flow pump model is numerically simulated by using CFX software, and its external characteristic performance parameters are calculated. The data input of CFX software is analyzed. On the basis of the output method, the format of the pre-processing data input file and the post-processing data output file are determined, and the density degree of the blade tip cascade, the density multiple of the blade blade cascade, the density multiple of the blade blade cascade are selected. There are four optimal design parameters for blade span dimensionless load coefficient A / B and C / B to control the airfoil length and placement angle of each section of the blade, and to adjust the CAD program of the impeller of the mixed flow pump. The parametric modeling of impeller blade is realized. The effectiveness of searching space for optimized parameters is verified by analyzing the modeling effect and mesh division of impeller modeling. Finally, the parametric modeling of blade is constructed by using iSIGHT-FD software platform. The flow chart of automatic optimization design of mixed flow pump impeller based on mesh division, numerical simulation and NLPQL optimization algorithm is presented. The initial blade is automatically optimized under design conditions. By comparing and analyzing the performance of impeller before and after optimization, the performance of impeller is improved, which shows that the automatic optimization design method is effective and feasible.
【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH313

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