本文關(guān)鍵詞： 雙吸離心泵 湍流模型 內(nèi)部流場(chǎng) 導(dǎo)流板 優(yōu)化 數(shù)值模擬　出處：《東北石油大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：泵是一種應(yīng)用范圍極其廣泛的通用機(jī)械,有流體流動(dòng)的地方,幾乎都會(huì)有泵在工作。離心泵更是泵類(lèi)中應(yīng)用范圍最廣泛的一種,約占泵類(lèi)設(shè)備總量的70%。雙吸離心泵是離心泵的一種重要形式,具有揚(yáng)程高、流量大、便于檢查和維修的特點(diǎn),越來(lái)越受到工程應(yīng)用的青睞。因此了解雙吸離心泵內(nèi)部流體流動(dòng)特性,改進(jìn)雙吸離心泵的結(jié)構(gòu),優(yōu)化內(nèi)部流場(chǎng),提高雙吸泵的效率對(duì)推動(dòng)泵行業(yè)的發(fā)展具有重要且深遠(yuǎn)的意義。本文對(duì)OTS 125-500A型雙吸離心泵進(jìn)行三維建模,將常用于數(shù)值模擬的5種湍流模型依次用于離心泵流動(dòng)仿真過(guò)程中。將數(shù)值計(jì)算結(jié)果與試驗(yàn)結(jié)果相對(duì)比,考慮揚(yáng)程、效率等性能參數(shù),發(fā)現(xiàn):模擬數(shù)據(jù)與試驗(yàn)數(shù)據(jù)基本一致,數(shù)值模擬結(jié)果可信。在設(shè)計(jì)工況點(diǎn)處,五種湍流模型對(duì)雙吸離心泵的適用性都很好,誤差值均很小;在小流量工況下,Realizable k??湍流模型得到的計(jì)算結(jié)果與試驗(yàn)結(jié)果更接近;大流量工況下,SST k??湍流模型得到的計(jì)算結(jié)果精度更高。觀察不同工況下離心泵內(nèi)部流場(chǎng)的流動(dòng)狀態(tài),分析雙吸離心泵內(nèi)部的靜壓力場(chǎng)、速度場(chǎng)和湍動(dòng)能分布,得到離心泵內(nèi)部流場(chǎng)的流動(dòng)規(guī)律。研究結(jié)果發(fā)現(xiàn),在葉輪流道內(nèi)存在“射流-尾跡”現(xiàn)象;由于蝸舌對(duì)流體的干擾,在蝸殼流道內(nèi)產(chǎn)生回流現(xiàn)象,造成大量能量損失,降低離心泵運(yùn)行效率。根據(jù)雙吸離心泵內(nèi)部流場(chǎng)數(shù)值模擬結(jié)果,在不改變離心泵結(jié)構(gòu)的基礎(chǔ)上,將導(dǎo)流板應(yīng)用于蝸殼流道中以實(shí)現(xiàn)雙吸離心泵內(nèi)部流場(chǎng)優(yōu)化。討論導(dǎo)流板形狀、數(shù)量、位置等因素的變化對(duì)離心泵內(nèi)部流場(chǎng)的影響,研究結(jié)果表明,弧形導(dǎo)流板更適用于離心泵內(nèi)部流場(chǎng)優(yōu)化;由于離心泵喉部流道較為狹窄,考慮效率等性能參數(shù),最終確定只添加一塊導(dǎo)流板,并將其安裝在蝸殼流道中間位置偏上1/3處效果最佳,在抑制回流現(xiàn)象的同時(shí)也可以提升離心泵效率。
[Abstract]:Pump is a kind of universal machinery which has a wide range of applications. Where there is fluid flow, there will almost always be pumps in operation, and centrifugal pumps are the most widely used type of pumps. Double suction centrifugal pump is an important form of centrifugal pump with high lift, large flow rate, easy inspection and maintenance. Therefore, the internal fluid flow characteristics of double suction centrifugal pump are understood, the structure of double suction centrifugal pump is improved, and the internal flow field is optimized. Improving the efficiency of double suction pump has important and far-reaching significance to promote the development of pump industry. In this paper, the three-dimensional modeling of OTS 125-500A double suction centrifugal pump is carried out. Five kinds of turbulence models, which are often used in numerical simulation, are used in the flow simulation of centrifugal pump in turn. By comparing the numerical results with the experimental results, and considering the performance parameters such as lift and efficiency, it is found that the simulated data are basically consistent with the experimental data. The results of numerical simulation are reliable. At the design point, the five turbulence models have good applicability to double suction centrifugal pump, and the error is very small. ? The calculated results obtained by the turbulence model are closer to the experimental results. ? The results obtained by the turbulence model are more accurate. The flow state in the centrifugal pump under different working conditions is observed, and the static pressure field, velocity field and turbulent kinetic energy distribution in the double suction centrifugal pump are analyzed. The flow pattern of centrifugal pump is obtained. The results show that there is a "jet-wake" phenomenon in the impeller passage, and a large amount of energy is lost due to the disturbance of the cochlear tongue to the fluid. According to the numerical simulation results of the internal flow field of the double suction centrifugal pump and without changing the structure of the centrifugal pump, the flow guide plate is applied to the volute runner to optimize the flow field in the double suction centrifugal pump, and the shape of the guide plate is discussed. The effect of quantity, position and other factors on the flow field of centrifugal pump is studied. The results show that the arc guide plate is more suitable for the optimization of flow field in centrifugal pump, because the throat passage of centrifugal pump is narrow, the performance parameters such as efficiency are considered. It is determined that only one guide plate is added and installed in the middle position of the volute channel at 1/3. It can also improve the efficiency of centrifugal pump while restraining the phenomenon of backflow.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TH311

【二級(jí)參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 魏佳廣;孫鐵;馮世杰;;離心泵葉輪扭曲葉片參數(shù)化實(shí)體造型研究[J];節(jié)能技術(shù);2010年05期

2 侯明偉;;單級(jí)雙吸中開(kāi)式離心泵的技術(shù)改造[J];科技信息;2009年28期

3 李文廣,陳秉二;葉輪幾何參數(shù)對(duì)泵能量性能影響的正交試驗(yàn)研究[J];流體工程;1991年03期

4 高章發(fā),姜紹東,劉靜;設(shè)計(jì)參數(shù)對(duì)泵性能曲線(xiàn)形狀的影響分析[J];流體機(jī)械;2002年08期

5 閔思明;楊敏;王福軍;;雙蝸殼式雙吸離心泵流動(dòng)特性的數(shù)值研究[J];流體機(jī)械;2010年10期

6 吳賢芳;談明高;劉厚林;王勇;王凱;;葉片出口角對(duì)離心泵性能曲線(xiàn)形狀的影響[J];農(nóng)機(jī)化研究;2010年09期

7 黃仕元,何少華,張宇;離心泵總效率的影響因素分析[J];節(jié)能;2003年03期

8 周德峰;;葉片出口角對(duì)離心泵揚(yáng)程的影響[J];排灌機(jī)械;1987年02期

9 郭自杰;;渦殼泵面積比原理討論[J];排灌機(jī)械;1989年02期

10 高章發(fā),龐偉;半螺旋形吸入室的設(shè)計(jì)和計(jì)算[J];排灌機(jī)械;2001年05期

，

本文編號(hào)：1535143