高揚程農(nóng)用灌溉離心泵優(yōu)化設(shè)計
發(fā)布時間：2019-04-11 13:51
【摘要】：我國南方丘陵山區(qū)因特殊的地理位置,抗旱排灌農(nóng)用泵多為揚程高、重量輕、體積小、結(jié)構(gòu)簡單的低比轉(zhuǎn)速離心泵,這類離心泵普遍存在三大問題：效率低、揚程曲線易出現(xiàn)駝峰、運行易過載。特別是易過載問題對用戶構(gòu)成了很大的安全隱患。 為深入了解低比轉(zhuǎn)速離心泵易過載的問題,本文選擇了一組具有代表性的參數(shù)作為設(shè)計實例,比較系統(tǒng)地按理論分析、水力設(shè)計和數(shù)值模擬等三方面進行了研究分析,對離心泵過流部件主要結(jié)構(gòu)參數(shù)進行了優(yōu)化,并在數(shù)值模擬的基礎(chǔ)上對其進行了性能預(yù)測。主要包括以下內(nèi)容： (1)介紹了離心泵現(xiàn)有水力設(shè)計方法以及其優(yōu)缺點,總結(jié)了過流部件結(jié)構(gòu)參數(shù)選擇的一般原則；對低比轉(zhuǎn)速離心泵高揚程、高效率、無駝峰、無過載性能進行了研究探討,認為實現(xiàn)以上性能統(tǒng)一是存在可能的；分析了過流部件幾何參數(shù)對離心泵特性曲線的影響,解決過載、駝峰問題可采取減小β2、b2、Z、F,和增大D2等措施。 (2)采用無過載設(shè)計法對離心泵過流部件進行了無過載性能設(shè)計,得到了過流部件主要結(jié)構(gòu)參數(shù)和其水力圖；利用參數(shù)化的UG軟件對葉輪和蝸殼進行了三維建模,并將三維實體模型導(dǎo)入GAMBIT中進行網(wǎng)格劃分,再將劃分好的網(wǎng)格數(shù)據(jù)文件導(dǎo)入FLUENT中進行數(shù)值計算,獲取離心泵內(nèi)部流動信息。 (3)簡述了離心泵內(nèi)流體運動的控制方程、湍流模型以及邊界條件等有關(guān)理論；比較分析了三種離心泵性能預(yù)測方法；對離心泵葉輪與蝸殼禍合進行了全三維流場的數(shù)值計算,獲得了泵內(nèi)部流體運動的壓力分布圖和速度分布圖等信息,為優(yōu)化離心泵過流部件提供了參考依據(jù),指明了結(jié)構(gòu)改進方向。 (4)數(shù)值模擬得到的離心泵內(nèi)部流態(tài)與其實際運行的理論分析結(jié)果趨勢基本一致,表明本文的無過載設(shè)計是合理的,對有關(guān)設(shè)計研究工作具有一定的參考價值和意義。 (5)最后,本文指出了研究中存在的不足之處,并對今后的研究工作提出了研究方向。
[Abstract]:Because of the special geographical position in the hilly and mountainous areas of southern China, the agricultural pumps for drought-resistant drainage and irrigation are mostly low specific speed centrifugal pumps with high lift, light weight, small volume and simple structure. There are three major problems in this kind of centrifugal pumps: low efficiency, low efficiency. Lift curve is easy to appear hump, easy to overload. In particular, the problem of easy overloading constitutes a great security hazard for users. In order to understand the overloading problem of centrifugal pump with low specific speed, this paper chooses a group of representative parameters as a design example, and makes a systematic research and analysis according to the theoretical analysis, hydraulic design and numerical simulation. The main structural parameters of centrifugal pump flow-through components are optimized and their performance is predicted on the basis of numerical simulation. The main contents are as follows: (1) the existing hydraulic design methods of centrifugal pumps and their advantages and disadvantages are introduced, and the general principles for selecting the structural parameters of flow-through components are summarized. The high lift, high efficiency, no hump and no overload performance of centrifugal pump with low specific speed are studied and discussed. It is considered that it is possible to realize the unity of above performance. The influence of the geometric parameters of the overflow component on the characteristic curve of centrifugal pump is analyzed. The overloading and hump problem can be solved by reducing 尾 _ 2, b _ 2, Z, F, and increasing D _ 2, etc. (2) the non-overload design method is used to design the over-flow component of centrifugal pump without overload, and the main structural parameters and hydrograph of the over-flow component are obtained. The three-dimensional modeling of impeller and volute was carried out by using parameterized UG software, and the three-dimensional solid model was imported into GAMBIT for mesh generation. Then the partitioned grid data file was imported into FLUENT for numerical calculation, and the internal flow information of centrifugal pump was obtained. (3) the governing equation, turbulence model and boundary condition of fluid movement in centrifugal pump are introduced, and three kinds of prediction methods of centrifugal pump performance are compared and analyzed. The numerical calculation of the whole three-dimensional flow field of centrifugal pump impeller and volute is carried out, and the pressure distribution diagram and velocity distribution diagram of the fluid movement inside the pump are obtained, which provides a reference for optimizing the flow-through parts of centrifugal pump. The direction of structural improvement is pointed out. (4) the internal flow pattern of centrifugal pump obtained by numerical simulation is basically consistent with the theoretical analysis results of its actual operation, which shows that the non-overload design in this paper is reasonable and has certain reference value and significance for the relevant design and research work. (5) at last, this paper points out the deficiency of the research, and puts forward the research direction of the future research.
【學(xué)位授予單位】：中南林業(yè)科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH311
本文編號：2456458
[Abstract]:Because of the special geographical position in the hilly and mountainous areas of southern China, the agricultural pumps for drought-resistant drainage and irrigation are mostly low specific speed centrifugal pumps with high lift, light weight, small volume and simple structure. There are three major problems in this kind of centrifugal pumps: low efficiency, low efficiency. Lift curve is easy to appear hump, easy to overload. In particular, the problem of easy overloading constitutes a great security hazard for users. In order to understand the overloading problem of centrifugal pump with low specific speed, this paper chooses a group of representative parameters as a design example, and makes a systematic research and analysis according to the theoretical analysis, hydraulic design and numerical simulation. The main structural parameters of centrifugal pump flow-through components are optimized and their performance is predicted on the basis of numerical simulation. The main contents are as follows: (1) the existing hydraulic design methods of centrifugal pumps and their advantages and disadvantages are introduced, and the general principles for selecting the structural parameters of flow-through components are summarized. The high lift, high efficiency, no hump and no overload performance of centrifugal pump with low specific speed are studied and discussed. It is considered that it is possible to realize the unity of above performance. The influence of the geometric parameters of the overflow component on the characteristic curve of centrifugal pump is analyzed. The overloading and hump problem can be solved by reducing 尾 _ 2, b _ 2, Z, F, and increasing D _ 2, etc. (2) the non-overload design method is used to design the over-flow component of centrifugal pump without overload, and the main structural parameters and hydrograph of the over-flow component are obtained. The three-dimensional modeling of impeller and volute was carried out by using parameterized UG software, and the three-dimensional solid model was imported into GAMBIT for mesh generation. Then the partitioned grid data file was imported into FLUENT for numerical calculation, and the internal flow information of centrifugal pump was obtained. (3) the governing equation, turbulence model and boundary condition of fluid movement in centrifugal pump are introduced, and three kinds of prediction methods of centrifugal pump performance are compared and analyzed. The numerical calculation of the whole three-dimensional flow field of centrifugal pump impeller and volute is carried out, and the pressure distribution diagram and velocity distribution diagram of the fluid movement inside the pump are obtained, which provides a reference for optimizing the flow-through parts of centrifugal pump. The direction of structural improvement is pointed out. (4) the internal flow pattern of centrifugal pump obtained by numerical simulation is basically consistent with the theoretical analysis results of its actual operation, which shows that the non-overload design in this paper is reasonable and has certain reference value and significance for the relevant design and research work. (5) at last, this paper points out the deficiency of the research, and puts forward the research direction of the future research.
【學(xué)位授予單位】：中南林業(yè)科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH311
【引證文獻】
相關(guān)碩士學(xué)位論文 前1條
1 千勃興;離心泵葉輪葉片的有限元分析及優(yōu)化[D];西北農(nóng)林科技大學(xué);2013年
，本文編號：2456458
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