清淤船用旋流式泥浆泵内流分析与优化设计
发布时间：2018-12-13 21:48
【摘要】：旋流式泥浆泵广泛应用在河道、鱼塘等清淤工程中,是旋挖式清淤船的关键部件。旋流式泥浆泵采用离心式叶轮,其区别在于叶轮不是安装在蜗壳中,而是退缩至压水室后面,即叶轮与前泵壳壁之间在轴向空间宽度较大,从而使得其有很好的通过性能。旋流泵叶轮设计与常规的离心泵叶轮设计基本相同,但其工作原理与传统的叶片泵(离心泵、混流泵、轴流泵和螺旋泵)并不完全相同。 本文结合汇合江苏水利科技项目研究,采用计算流体力学方法,开展XLB260型旋流泵内部流动分析,探索旋流泵的无叶腔和叶轮内部流动规律,研究设计参数对泵性能的影响,为实现旋流式泥浆泵的性能预测和优化设计提供了参考依据。开展的主要工作和取得的成果如下： (1)对国内外旋流泵的理论研究、数值模拟和试验研究成果进行了分析和总结,提出了本文研究的主要方向和内容。 (2)采用三维造型软件PRO/E进行XLB260型旋流泵三维实体造型；利用ANSYS自带的ICEM软件对三维实体模型完成网格划分,并对划分好的网格做了无关性分析,定量分析了旋流泵数值模拟计算结果和网格数量的关系；利用流场计算软件CFX,运用雷诺平均方程,并选择湍流模型中比较常用的标准k-e模型,对旋流泵在不同流量工况下进行了三维定常液相数值模拟计算,根据计算所得结果分析了旋流泵的内部特性和外部特性,得到了XLB260的旋流泵的流量、扬程、功率和效率的性能曲线。 (3)采用正交试验方法,分析了XLB260型旋流式泥浆泵流道进口直径d1、叶片数Z、叶轮外径与壳体的间隙e对性能的影响,并根据数据结果和性能曲线图确定了三个参数对泵性能影响的主次顺序,然后利用直观分析法和综合平衡分析法找出了旋流泵的最优参数组合。(4)开展了XLB260型旋流式泥浆泵三维非定常计算,分析了非定常流场的内部特性,对不同工况下的定常和非定常计算结果进行了定量和定性的比较。 (5)本文进行了XLB260型旋流式泥浆泵在不同泥浆深度和不同粒径下的固-液两相流计算,分析了旋流泵内部流速、压力在泥沙颗粒直径和浓度变化时的分布,计算了对应流量下的旋流泵扬程及效率,发现在泥沙颗粒直径和浓度变化的情况下,扬程和效率均随之发生相应变化。
[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.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV136.3
本文编号：2377300
[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.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV136.3
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