【摘要】：開式葉輪離心泵具有幾乎連續(xù)不變的揚(yáng)程流量曲線，即揚(yáng)程在整個(gè)流量范圍內(nèi)變化很小，廣泛應(yīng)用于石油、化工及航空航天等領(lǐng)域。雖然開式葉輪離心泵在一些場合發(fā)揮著重要作用，但是效率有待提高。本文采用數(shù)值計(jì)算和試驗(yàn)的研究方法，對兩種葉型的半開葉輪對離心泵性能影響進(jìn)行了研究，旨在了解葉型對離心泵內(nèi)部流動(dòng)情況以及外特性性能的影響規(guī)律，為半開葉輪離心泵的優(yōu)化和改進(jìn)提供依據(jù)和參考。具體研究內(nèi)容包括以下幾個(gè)方面： （1）利用三維造型軟件對兩種葉型的半開式葉輪離心泵的過流部件進(jìn)行了三維實(shí)體建模，主要有誘導(dǎo)輪、直葉片半開式葉輪、彎葉片半開式葉輪、蝸殼。利用NUMECA軟件，采用分塊技術(shù)、蝶形網(wǎng)格、完全匹配等技術(shù)對過流部件生成六面體結(jié)構(gòu)化網(wǎng)格，并給出邊界條件設(shè)置。 （2）采用雷諾時(shí)均Navier-Stokes方程和Spalart-Allmaras模型湍流模型，在額定轉(zhuǎn)速2900r/min和低轉(zhuǎn)速1450r/min兩種轉(zhuǎn)速工況下，分別對直葉片半開式葉輪和彎葉片半開式葉輪離心泵內(nèi)部流動(dòng)進(jìn)行了整機(jī)定常數(shù)值模擬，分析了葉型對離心泵過流部件的流動(dòng)特性及外特性性能的影響規(guī)律。 （3）對兩種葉型的半開式葉輪離心泵在2900r/min和1450r/min轉(zhuǎn)速進(jìn)行了試驗(yàn)研究，得到了直葉片半開式葉輪、彎葉片半開式葉輪在不同轉(zhuǎn)速工況下的離心泵性能曲線，并和數(shù)值模擬結(jié)果進(jìn)行了對比分析。
[Abstract]:The open impeller centrifugal pump has almost constant lift flow curve, that is, the lift has little change in the whole flow range, which is widely used in petroleum, chemical industry, aerospace and other fields. Although the open impeller centrifugal pump plays an important role in some occasions, the efficiency needs to be improved. In this paper, the effect of two kinds of semi-open impellers on the performance of centrifugal pump is studied by numerical calculation and experimental method. The purpose of this paper is to understand the influence of blade shape on the internal flow and external performance of centrifugal pump. It provides basis and reference for optimization and improvement of semi-open impeller centrifugal pump. The specific research contents include the following aspects: (1) the three dimensional solid modeling of the flow components of two kinds of semi-open impeller centrifugal pump with two kinds of blade shapes are carried out by using three-dimensional modeling software, which mainly includes induction wheel, straight blade semi-open impeller, and direct blade semi-open impeller. Curved blade half-open impeller, volute. Using NUMECA software, block technique, butterfly mesh and perfect matching technique are used to generate hexahedron structured meshes for flow components. (2) Reynolds time averaged Navier-Stokes equation and Spalart-Allmaras model turbulence model are used. Under the condition of rated speed 2900r/min and low speed 1450r/min, the flow inside the centrifugal pump of semi-open impeller with straight blade and semi-open impeller with curved blade is simulated numerically. The influence of blade profile on the flow characteristics and external performance of the flow passing parts of centrifugal pump is analyzed. (3) two kinds of semi-open impeller centrifugal pumps with two kinds of blades are tested at 2900r/min and 1450r/min speed, and the semi-open impellers with straight vane are obtained. The performance curve of centrifugal pump with curved blade semi-open impeller under different rotating speed conditions is analyzed and compared with the numerical simulation results.
【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH311

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