【摘要】：中高比轉(zhuǎn)速離心泵的葉輪設(shè)計多采用一元理論，且少有研究，本文采用二元有勢流動理論設(shè)計中高比轉(zhuǎn)速離心泵葉輪，并與傳統(tǒng)的采用一元理論設(shè)計的葉輪進(jìn)行對比，分析其內(nèi)部流動及外特性。本文采用CFD計算軟件Fluent6.3，對基于兩種設(shè)計方法的葉輪的流體計算域模型進(jìn)行全流場三維湍流數(shù)值模擬，旨在研究葉輪二元理論（ωu=0）的設(shè)計，對比葉輪內(nèi)部流動狀態(tài)以及對其性能的影響規(guī)律，本課題的主要研究內(nèi)容和所做的主要工作如下： 1、根據(jù)離心泵的基本設(shè)計參數(shù)，首先基于傳統(tǒng)的離心泵一元設(shè)計理論，設(shè)計了1號葉輪；然后基于ωu=0的二元設(shè)計理論，選取了六種速度矩分布規(guī)律，完成了2號~7號葉輪的水力設(shè)計。 2、對設(shè)計得到的七個葉輪方案進(jìn)行精確的全流道三維實體造型和網(wǎng)格劃分，為全流道內(nèi)部流動CFD數(shù)值模擬計算及其性能預(yù)測的準(zhǔn)確性奠定可靠的基礎(chǔ)。 3、CFD數(shù)值模擬采用雷諾時均Navier-Stockes方程和標(biāo)準(zhǔn)k ε湍流模型，利用SIMPLEC算法，對采用兩種設(shè)計理論設(shè)計的七個葉輪的離心泵進(jìn)行了全流場數(shù)值模擬，進(jìn)一步處理1號～4號模型的計算數(shù)據(jù)，得到葉片沿軸面流線的軸面速度和速度矩分布，，將不同葉輪設(shè)計理論假設(shè)的速度分布與真實流場的速度分布進(jìn)行了對比分析。 4、分別對采用一元理論和二元理論設(shè)計的葉輪的離心泵，在0.4Q、0.6Q、0.8Q、1.0Q、1.2Q等不同流量運(yùn)行工況進(jìn)行了數(shù)值模擬對比，得到了1號～4號模型方案內(nèi)部流場的壓力分布和速度分布，比較了兩種方案的外特性數(shù)值模擬結(jié)果。 本課題的主要創(chuàng)新點如下： 1、采用二元理論設(shè)計了中高比轉(zhuǎn)速離心泵葉輪，對比分析了兩種設(shè)計理論的假設(shè)與真實流動規(guī)律的差異。 2、設(shè)計出了一個較為接近二元有勢流動規(guī)律的葉輪，對比分析了葉輪內(nèi)部流體進(jìn)出口速度矩值與葉輪能量頭和效率的關(guān)系。 由于時間、條件和本人經(jīng)驗不足所限，本課題做的工作有限，有很多工作目前還沒有進(jìn)行到位。文中給出的基于二元設(shè)計理論的葉輪的水力設(shè)計，尤其是葉片上速度矩的取值和分布，還有很大的提升空間，有待于以后繼續(xù)深入研究和探討。
[Abstract]:The impeller design of medium and high specific speed centrifugal pump is mostly based on the monadic theory, and few studies have been done. In this paper, binary potential flow theory is used to design the impeller of the centrifugal pump with middle and high specific rotational speed, and it is compared with the traditional impeller designed by univariate theory. Its internal flow and external characteristics are analyzed. In this paper, three dimensional turbulent numerical simulation of impeller fluid computational domain model based on two design methods is carried out by using CFD software Fluent6.3,. The purpose of this paper is to study the design of impeller binary theory (蠅 UO). Comparing the internal flow state of impeller and the influence law on its performance, the main research contents and main work of this subject are as follows: 1. According to the basic design parameters of centrifugal pump, firstly, based on the traditional centrifugal pump monolithic design theory, The impeller No. 1 is designed. Then based on the dual design theory of omega 0, the hydraulic design of impeller No. 2 ~ 7 is completed by selecting six laws of velocity and moment distribution. 2. The three dimensional solid modeling and mesh division of the seven impeller schemes were carried out, which laid a reliable foundation for the CFD numerical simulation of the flow inside the channel and the accuracy of the performance prediction. Using Reynolds time averaged Navier-Stockes equation and standard k 蔚 turbulence model, the full flow field of a centrifugal pump with seven impellers designed by two design theories was simulated by using SIMPLEC algorithm. Further processing the calculation data of model 1 ~ 4, the axial velocity and velocity moment distribution of blade along the axial streamline are obtained. The velocity distribution of different impeller design theory hypotheses is compared with the velocity distribution of real flow field. 4. The centrifugal pump with impeller designed by univariate theory and binary theory is numerically simulated and compared under different flow operating conditions, such as 0.4Q0. 6Q / 0. 8Q / 1. 2Q, etc. The pressure distribution and velocity distribution of the flow field in model No.1 ~ 4 are obtained and the numerical simulation results of the external characteristics of the two schemes are compared. The main innovations of this paper are as follows: 1. The impeller of centrifugal pump with medium and high specific speed is designed by using binary theory, and the differences between the hypotheses and the real flow laws of the two design theories are compared and analyzed. 2. A impeller which is close to the law of binary potential flow is designed, and the relationship between the inlet and outlet moment of fluid and the energy head and efficiency of impeller is compared and analyzed. Due to the limitation of time, condition and experience, the work of this subject is limited, and a lot of work has not been done yet. In this paper, the hydraulic design of impeller based on binary design theory, especially the value and distribution of velocity moment on blade, still has a lot of lifting space, which needs to be further studied and discussed in the future.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH311

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