【摘要】：作為軸流泵裝置的核心部件,軸流泵的葉輪和導(dǎo)葉,是整個(gè)軸流泵過流裝置中重要的組成部分。也是實(shí)現(xiàn)能量轉(zhuǎn)換的重要組成,直接關(guān)系到水泵的性能。提高整個(gè)泵裝置的性能,基本都是從葉輪和導(dǎo)葉兩個(gè)方面入手。因此,研究葉輪的結(jié)構(gòu)參數(shù)和導(dǎo)葉體的布置位置對水泵性能的影響具有現(xiàn)實(shí)的指導(dǎo)意義。 不同的參數(shù)設(shè)置方案對軸流泵的性能有著不同的影響。故有必要從軸流泵的內(nèi)流場和外特性出發(fā)來分析和研究不同情況對泵的影響。本文采用了三維湍流數(shù)值模擬(CFD)作為研究手段,針對高速軸流泵在三種不同參數(shù)下的方案進(jìn)行了數(shù)值模擬和分析,并總結(jié)了一些規(guī)律。對研究高比轉(zhuǎn)速軸流泵的水力優(yōu)化設(shè)計(jì)有一定的參考價(jià)值。 本文的主要工作有： 1、結(jié)合AutoCAD與Pro/ENGINEER軟件對整個(gè)泵裝置進(jìn)行三維實(shí)體造型,采用ICEM對進(jìn)水管,出水管,彎管進(jìn)行網(wǎng)格剖分,對葉輪和導(dǎo)葉體使用Turbo-Grid進(jìn)行網(wǎng)格剖分； 2、利用CFD軟件(ANSYS CFX12.0),基于雷諾時(shí)均Navier-Stockes方程和標(biāo)準(zhǔn)κ-ε雙方程湍流模型,對三種不同情況下(不同葉片厚度,不同葉片數(shù),不同導(dǎo)葉進(jìn)口與葉輪出口平行間距)進(jìn)行全通道數(shù)值模擬,捕捉葉輪內(nèi)速度分布、靜壓分布等重要流動參數(shù),并進(jìn)行對比分析； 3、通過CFX-Post后處理得到如下結(jié)論： (1)對不同葉片厚度的數(shù)值模擬計(jì)算分析之后可知,當(dāng)流量較小時(shí),葉片厚度的變換,不會引起較大的變化,其揚(yáng)程,功率和效率基本都是重合的；而在設(shè)計(jì)流量左右,葉片厚度減小,相同流量下?lián)P程趨勢會有所改變,其趨勢接近于在同一流量下,伴隨厚度的增加,其揚(yáng)程,功率都會下降,在效率方面,可以明顯的看出,雖然有類似于上面的趨勢,但是某些點(diǎn)還是發(fā)生了重疊的現(xiàn)象；大流量時(shí),其揚(yáng)程,功率和效率基本沒有太大變化。 (2)對不同葉片數(shù)的數(shù)值模擬計(jì)算分析后可知,相對于三片葉片而言,四片在小流量情況下?lián)P程和效率都相對較高；而在大流量情況下,兩者基本重合。并且在馬鞍區(qū)右側(cè)部分有上移的現(xiàn)象。 (3)對不同的導(dǎo)葉進(jìn)口與葉輪出口的平行間距S進(jìn)行數(shù)值模擬分析后可知,當(dāng)S的數(shù)值取值比較小時(shí)(在0.05D～0.1D之間),在設(shè)計(jì)流量下,出口速度環(huán)量分布及靜壓分布相對均勻,對整個(gè)泵裝置的性能提高有一定的提升。超出0.1D之后,出口速度環(huán)量分布及靜壓分布都不十分理想,S的改變對于整個(gè)泵裝置性能的改變沒有太大的影響。可見S的改變,在一定的范圍內(nèi)對泵裝置的性能還是有影響的。單純的靠改變間距S來提高泵段的整體性能還是有一定局限的,要根據(jù)泵的實(shí)際工況水平,來選擇相對應(yīng)的距離S。
[Abstract]:As the core component of axial flow pump, the impeller and guide vane of axial flow pump is an important part in the whole axial flow pump overflowing device. Is also an important component of energy conversion, directly related to the performance of the pump. Improve the performance of the whole pump device, basically from the impeller and guide vane two aspects. Therefore, it is of practical significance to study the influence of impeller structure parameters and impeller position on pump performance. Different parameter setting schemes have different influence on the performance of axial flow pump. Therefore, it is necessary to analyze and study the influence of different conditions on the pump from the internal flow field and external characteristics of the axial flow pump. In this paper, three-dimensional turbulent numerical simulation (CFD) is used to simulate and analyze the scheme of high-speed axial flow pump under three different parameters, and some rules are summarized. It has certain reference value for studying the hydraulic optimization design of high specific speed axial flow pump. The main work of this paper is as follows: 1. Using AutoCAD and Pro/ENGINEER software to model the whole pump device, using ICEM to mesh the intake pipe, outlet pipe and elbow pipe, and using Turbo-Grid to mesh the impeller and guide blade body; 2. Using CFD software (ANSYS CFX12.0), based on Reynolds time average Navier-Stockes equation and standard 魏-蔚 two-equation turbulence model, three different conditions (different blade thickness, different blade number), The flow parameters such as velocity distribution and static pressure distribution in the impeller are captured and analyzed by numerical simulation of the parallel distance between the inlet of the guide vane and the outlet of the impeller. 3, through CFX-Post post-processing, the following conclusions are obtained: (1) after the numerical simulation and analysis of different blade thickness, it is known that when the flow rate is small, the change of blade thickness will not cause great change, and its head will not change. Power and efficiency are basically the same; But at the design flow rate, the blade thickness decreases, and the lift trend will change at the same flow rate. The trend is close to that under the same flow rate, and with the increase of the thickness, the head and power will decrease. In terms of efficiency, it can be seen clearly. Although there is a trend similar to the above, some points still overlap; When large flow rate, its lift, power and efficiency basically have not changed too much. (2) after numerical simulation and analysis of different blade numbers, it can be seen that compared with three blades, the lift and efficiency of the four blades are relatively high in the case of small flow rate, while in the case of large flow rate, the two basically coincide. And there is an upward movement in the right part of the saddle area. (3) the numerical simulation of the parallel distance S between the inlet of the guide vane and the outlet of the impeller shows that when the numerical value of S is small (between 0.05D~0.1D), under the design flow rate, The volume distribution and static pressure distribution of the outlet velocity ring are relatively uniform, which can improve the performance of the whole pump device to a certain extent. After 0.1 D, the distribution of the outlet velocity loop and the static pressure are not very ideal, and the change of S has no great effect on the performance of the whole pump device. Visible changes in S, in a certain range of pump device performance is still affected. Simply by changing the distance S to improve the overall performance of the pump is still limited, according to the actual operating level of the pump, to select the corresponding distance S.
【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH312

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