發(fā)布時(shí)間：2018-12-13 21:48

【摘要】：旋流式泥漿泵廣泛應(yīng)用在河道、魚塘等清淤工程中,是旋挖式清淤船的關(guān)鍵部件。旋流式泥漿泵采用離心式葉輪,其區(qū)別在于葉輪不是安裝在蝸殼中,而是退縮至壓水室后面,即葉輪與前泵殼壁之間在軸向空間寬度較大,從而使得其有很好的通過性能。旋流泵葉輪設(shè)計(jì)與常規(guī)的離心泵葉輪設(shè)計(jì)基本相同,但其工作原理與傳統(tǒng)的葉片泵(離心泵、混流泵、軸流泵和螺旋泵)并不完全相同。 本文結(jié)合匯合江蘇水利科技項(xiàng)目研究,采用計(jì)算流體力學(xué)方法,開展XLB260型旋流泵內(nèi)部流動分析,探索旋流泵的無葉腔和葉輪內(nèi)部流動規(guī)律,研究設(shè)計(jì)參數(shù)對泵性能的影響,為實(shí)現(xiàn)旋流式泥漿泵的性能預(yù)測和優(yōu)化設(shè)計(jì)提供了參考依據(jù)。開展的主要工作和取得的成果如下： (1)對國內(nèi)外旋流泵的理論研究、數(shù)值模擬和試驗(yàn)研究成果進(jìn)行了分析和總結(jié),提出了本文研究的主要方向和內(nèi)容。 (2)采用三維造型軟件PRO/E進(jìn)行XLB260型旋流泵三維實(shí)體造型；利用ANSYS自帶的ICEM軟件對三維實(shí)體模型完成網(wǎng)格劃分,并對劃分好的網(wǎng)格做了無關(guān)性分析,定量分析了旋流泵數(shù)值模擬計(jì)算結(jié)果和網(wǎng)格數(shù)量的關(guān)系；利用流場計(jì)算軟件CFX,運(yùn)用雷諾平均方程,并選擇湍流模型中比較常用的標(biāo)準(zhǔn)k-e模型,對旋流泵在不同流量工況下進(jìn)行了三維定常液相數(shù)值模擬計(jì)算,根據(jù)計(jì)算所得結(jié)果分析了旋流泵的內(nèi)部特性和外部特性,得到了XLB260的旋流泵的流量、揚(yáng)程、功率和效率的性能曲線。 (3)采用正交試驗(yàn)方法,分析了XLB260型旋流式泥漿泵流道進(jìn)口直徑d1、葉片數(shù)Z、葉輪外徑與殼體的間隙e對性能的影響,并根據(jù)數(shù)據(jù)結(jié)果和性能曲線圖確定了三個參數(shù)對泵性能影響的主次順序,然后利用直觀分析法和綜合平衡分析法找出了旋流泵的最優(yōu)參數(shù)組合。(4)開展了XLB260型旋流式泥漿泵三維非定常計(jì)算,分析了非定常流場的內(nèi)部特性,對不同工況下的定常和非定常計(jì)算結(jié)果進(jìn)行了定量和定性的比較。 (5)本文進(jìn)行了XLB260型旋流式泥漿泵在不同泥漿深度和不同粒徑下的固-液兩相流計(jì)算,分析了旋流泵內(nèi)部流速、壓力在泥沙顆粒直徑和濃度變化時(shí)的分布,計(jì)算了對應(yīng)流量下的旋流泵揚(yáng)程及效率,發(fā)現(xiàn)在泥沙顆粒直徑和濃度變化的情況下,揚(yáng)程和效率均隨之發(fā)生相應(yīng)變化。
[Abstract]:Swirling mud pump is widely used in dredging works such as river and fish ponds, which is the key component of rotary dredging ship. The centrifugal impeller is used in the rotary mud pump. The difference is that the impeller is not installed in the volute, but shrinks to the back of the pressure chamber, that is, the axial space width between the impeller and the front pump shell wall is large, which makes it have good passing performance. The impeller design of swirl pump is basically the same as that of conventional centrifugal pump impeller design, but its working principle is not identical with traditional vane pump (centrifugal pump, mixed flow pump, axial flow pump and spiral pump). In this paper, combined with the research of confluence of Jiangsu water conservancy science and technology project, the internal flow analysis of XLB260 type swirl pump is carried out by using computational fluid dynamics method, and the internal flow law of impeller and vaneless cavity of swirling flow pump is explored, and the influence of design parameters on pump performance is studied. It provides a reference for performance prediction and optimization design of rotary mud pump. The main work and results obtained are as follows: (1) the theoretical research, numerical simulation and experimental research results of swirl pump at home and abroad are analyzed and summarized, and the main research directions and contents of this paper are put forward. (2) 3D solid modeling of XLB260 swirl pump is carried out by using 3D modeling software PRO/E; Using the ICEM software of ANSYS to complete the mesh division of the 3D solid model and the analysis of the mesh independence, the relationship between the numerical simulation results of the swirl pump and the number of meshes is quantitatively analyzed. Using the Reynolds average equation and the standard k-e model which is commonly used in the turbulent flow model, the three-dimensional steady liquid phase numerical simulation of the swirl pump under different flow conditions is carried out by using the flow field calculation software CFX,. According to the calculated results, the internal and external characteristics of the swirl pump are analyzed, and the flow, head, power and efficiency performance curves of the swirl pump of XLB260 are obtained. (3) the effects of inlet diameter D1, blade number Z, outer diameter of impeller and clearance e of shell on the performance of XLB260 swirl mud pump are analyzed by orthogonal test. According to the results of the data and the curve of performance, the primary and secondary order of the influence of the three parameters on the performance of the pump is determined. Then the optimal parameter combination of swirl pump is found by using visual analysis method and comprehensive balance analysis method. (4) Three-dimensional unsteady calculation of XLB260 type swirling mud pump is carried out, and the internal characteristics of unsteady flow field are analyzed. The results of steady and unsteady calculation under different working conditions are compared quantitatively and qualitatively. (5) in this paper, the solid-liquid two-phase flow calculation of XLB260 type rotary mud pump with different mud depth and particle size is carried out, and the distribution of flow velocity and pressure in the swirl pump with the change of sediment particle diameter and concentration is analyzed. The lift and efficiency of the swirl pump under the corresponding flow rate are calculated. It is found that both the lift and the efficiency change with the change of sediment particle diameter and concentration.
【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】：2014
【分類號】：TV136.3

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本文編號：2377300