本文選題：低比轉(zhuǎn)速　切入點(diǎn)：復(fù)合葉輪　出處：《浙江理工大學(xué)》2011年碩士論文

【摘要】：低比轉(zhuǎn)速離心泵主要的能量轉(zhuǎn)換在復(fù)合葉輪內(nèi)完成,因此針對復(fù)合葉輪的優(yōu)化設(shè)計對離心泵的節(jié)能降耗有重要意義。CFD技術(shù)的快速發(fā)展為低比轉(zhuǎn)速復(fù)合葉輪離心泵的優(yōu)化設(shè)計提供了強(qiáng)有力的手段。本文在課題組原有研究的基礎(chǔ)上以效率為優(yōu)化目標(biāo),基于三維流動分析對具有長、短葉片的復(fù)合葉輪進(jìn)行了優(yōu)化設(shè)計,并對優(yōu)化前后葉輪的低比轉(zhuǎn)速復(fù)合葉輪離心泵整機(jī)進(jìn)行了數(shù)值模擬與性能預(yù)測,最后對優(yōu)化前后葉輪的離心泵進(jìn)行了試驗研究。主要內(nèi)容如下: (1)介紹了本文優(yōu)化設(shè)計及數(shù)值計算所采用的方法,利用Pro/E對過流部件:葉輪、誘導(dǎo)輪、蝸殼進(jìn)行了建模。利用NUMECA軟件,采用結(jié)構(gòu)化網(wǎng)格對整機(jī)進(jìn)行了網(wǎng)格劃分; (2)對復(fù)合葉輪進(jìn)行了參數(shù)化造型,以復(fù)合葉輪出口角β2和短葉片起始直徑Di2兩個參數(shù)為優(yōu)化變量,及復(fù)合葉輪出口角β2一個參數(shù)為優(yōu)化變量,在這兩種優(yōu)化策略下,基于效率為優(yōu)化目標(biāo)對復(fù)合葉輪單通道進(jìn)行了優(yōu)化設(shè)計研究,得到了兩種策略下優(yōu)化后的葉輪幾何模型,將其繪制成零件圖,為后續(xù)葉輪的加工提供依據(jù); (3)采用雷諾時均Navier-Stokes方程和Spalart-Allmaras模型湍流模型對優(yōu)化前后葉輪的低比轉(zhuǎn)速離心泵(共3臺)進(jìn)行了整機(jī)的三維數(shù)值模擬;分析優(yōu)化前后離心泵過流部件內(nèi)的流場特性;并對整機(jī)工況下優(yōu)化前后葉輪的低比轉(zhuǎn)速離心泵性能進(jìn)行了預(yù)測,驗證了優(yōu)化葉輪的離心泵的效率確實(shí)有所提高。 (4)對CFD優(yōu)化前后葉輪的離心泵進(jìn)行了外特性試驗研究,得到了優(yōu)化前后葉輪離心泵的性能曲線,并和數(shù)值模擬進(jìn)行了對比分析。試驗結(jié)果表明,優(yōu)化設(shè)計得到的葉輪Ⅰ與葉輪Ⅱ達(dá)到預(yù)期的性能,驗證了單個復(fù)合葉輪優(yōu)化的可行性。
[Abstract]:The main energy conversion of the centrifugal pump with low specific speed is completed in the composite impeller.Therefore, the optimization design of composite impeller is of great significance to the energy saving and consumption reduction of centrifugal pump. The rapid development of CFD technology provides a powerful means for the optimization design of low specific speed composite impeller centrifugal pump.In this paper, based on the original research of the research group, the optimization design of the composite impeller with long and short blades is carried out based on the three-dimensional flow analysis with efficiency as the optimization objective.Numerical simulation and performance prediction of low specific speed composite impeller centrifugal pump before and after optimization are carried out. Finally, the centrifugal pump of impeller before and after optimization is experimentally studied.The main contents are as follows:This paper introduces the method of optimization design and numerical calculation, and uses Pro/E to model the flow parts: impeller, inducer and volute.Using NUMECA software, the structure grid is used to divide the whole machine.(2) Parametric modeling of composite impeller was carried out. Two parameters, 尾 _ 2 and Di2 _ 2, were used as optimization variables, and 尾 _ 2 as optimization variables. Under these two optimization strategies, the two parameters, 尾 _ 2 and 尾 _ 2, were used as optimization variables.Based on the optimization goal of efficiency, the optimization design of single channel of composite impeller is studied, and the optimized geometric model of impeller under two strategies is obtained, and the geometric model of impeller is drawn into part drawing, which provides the basis for the subsequent processing of impeller.3) Three-dimensional numerical simulation of centrifugal pump with low specific speed of impeller before and after optimization is carried out by using Reynolds time average Navier-Stokes equation and turbulence model of Spalart-Allmaras model, and the flow field characteristics in the flow parts of centrifugal pump before and after optimization are analyzed.The performance of the centrifugal pump with low specific speed before and after the optimization of the impeller is predicted, and the efficiency of the centrifugal pump with the optimized impeller is proved to be improved.4) the external characteristics of impeller centrifugal pump before and after CFD optimization are studied, and the performance curves of impeller centrifugal pump before and after optimization are obtained and compared with numerical simulation.The experimental results show that the optimal design of impeller 鈪，

本文編號：1724103