本文選題：低比轉(zhuǎn)速　切入點：多級離心泵　出處：《浙江大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

【摘要】：AP1000化容補水泵等特殊低比轉(zhuǎn)速多級離心泵在性能上不但具有小流量高揚程的特點,還需保證從關(guān)死點到最大流量的多個工況的性能同時達到使用要求。同時,結(jié)構(gòu)的緊湊性,以及小流量不穩(wěn)定和大流量過載等問題也是低比轉(zhuǎn)速泵設(shè)計需要重點關(guān)注的問題。本文為形成結(jié)構(gòu)緊湊、穩(wěn)定性好、滿足多工況性能要求的低比轉(zhuǎn)速多級離心泵設(shè)計方法,以AP1000化容補水泵為實例,研究半開式多平衡孔復(fù)合葉輪和渦形雙流道導(dǎo)葉的性能,建立其三維流場模擬和性能預(yù)測方法,基于計算流體動力學(xué)(CFD)技術(shù)改進設(shè)計了滿足多工況性能要求的水力模型。 探討了低比轉(zhuǎn)速多級離心泵半開式葉輪、復(fù)合葉輪和導(dǎo)葉的設(shè)計原理和方法,給出關(guān)鍵參數(shù)的確定方法,分析了半開式直葉片復(fù)合葉輪和渦形雙流道結(jié)構(gòu)的設(shè)計要點。 給出了半開式葉輪離心泵全流道三維流動數(shù)值模擬方法,以單級半開式葉輪離心泵為模型,考慮葉輪前后間隙、平衡孔、口環(huán)間隙等結(jié)構(gòu),分析不同建模形式、湍流模式、離散方法對性能曲線預(yù)測計算精度的影響,完善和驗證了基于三維流動模擬的性能預(yù)測方法。 為滿足AP1000化容補水泵四個特殊工況點的性能和結(jié)構(gòu)緊湊型要求,設(shè)計了半開式多平衡孔復(fù)合直葉片葉輪和渦形流道式導(dǎo)葉結(jié)構(gòu),建立了包含葉輪、導(dǎo)葉、葉輪前后間隙、密封口環(huán)和平衡孔的三維全流道實體模型�；诒疚尿炞C的流場三維數(shù)值模擬方法,預(yù)測全工況下的水力性能,分析了決定低比轉(zhuǎn)速多級離心泵各工況性能的關(guān)鍵參數(shù)�；谀M結(jié)果給出了改善低比轉(zhuǎn)速多級離心泵性能的結(jié)構(gòu)或設(shè)計建議,并改進了過流部件結(jié)構(gòu),使AP1000化容補水泵模型滿足多工況運行可靠和大流量不過載的設(shè)計要求。 本文給出的多級離心泵葉輪與導(dǎo)葉的設(shè)計方法,以及相應(yīng)的三維流動數(shù)值模擬和性能預(yù)測方法,水力性能上滿足了多工況運行的要求,對低比轉(zhuǎn)速多級離心泵研究與核電系統(tǒng)補水泵研發(fā)具有一定意義。
[Abstract]:The special low specific speed multistage centrifugal pump such as AP1000 pump not only has the characteristics of small flow rate and high head, but also needs to ensure that the performance of multiple working conditions from dead point to maximum flow rate can meet the operational requirements at the same time. At the same time, the structure is compact. The problems of small flow instability and large flow overload are also important problems in the design of low specific speed pump. In this paper, the design method of low specific speed multistage centrifugal pump with compact structure, good stability and satisfying the performance requirements of multiple working conditions is presented. Taking AP1000 capacitive pump as an example, the performance of semi-open multi-balanced hole composite impeller and vortex-shaped double-channel guide vane is studied, and the three-dimensional flow field simulation and performance prediction method are established. Based on the computational fluid dynamics (CFD) technique, a hydraulic model was designed to meet the requirements of multi-condition performance. The design principle and method of semi-open impeller, compound impeller and guide vane of multistage centrifugal pump with low specific speed are discussed. The determination method of key parameters is given, and the design essentials of semi-open straight vane composite impeller and vortex double-channel structure are analyzed. In this paper, a numerical simulation method of three-dimensional flow in the full passage of semi-open impeller centrifugal pump is presented. Taking the single-stage semi-open impeller centrifugal pump as a model, considering the structure of the impeller's front and back clearance, the balance hole, the clearance of the mouth ring, and so on, the different modeling forms and the turbulence model are analyzed. The effect of discrete method on the accuracy of performance curve prediction is improved and verified. The performance prediction method based on 3D flow simulation is improved and validated. In order to meet the performance and structural compact requirements of four special working conditions of AP1000 capacitive water pump, a semi-open multi-balanced hole composite straight blade impeller and a vortex runner guide vane structure are designed, and the front and rear clearance of impeller, guide vane and impeller are established. Based on the 3D numerical simulation method of the flow field verified in this paper, the hydraulic performance of the whole working condition is predicted. The key parameters determining the performance of low specific speed multistage centrifugal pump are analyzed. Based on the simulation results, the structure or design suggestions for improving the performance of low specific speed multistage centrifugal pump are given, and the structure of overflowing parts is improved. The AP1000 capacitive pump model can meet the design requirements of reliable operation and high flow rate. The design method of multi-stage centrifugal pump impeller and guide vane, and the corresponding three-dimensional flow numerical simulation and performance prediction method are given in this paper. The hydraulic performance meets the requirements of multi-condition operation. It has a certain significance for the research of low specific speed multistage centrifugal pump and the research and development of nuclear power system feedwater pump.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH311

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本文編號：1595014