潜油泵叶轮设计及流场仿真研究

发布时间：2018-04-11 15:27

  本文选题：离心泵 + 数值模拟　； 参考：《东北石油大学》2017年硕士论文

【摘要】：离心泵属于通用机械的范畴,离心泵在国民经济生产的各个环节中都得到广泛的应用,但是离心泵存在能耗高效率低下的问题,多年来已有很多学者对离心泵进行研究,受研究手段及现有科学理论的限制,离心泵的效率研究没有得到显著提高。离心泵结构复杂,导致内部流场的流动形势极为复杂,复杂的机构及内部流场的同样复杂性给离心泵研究带来了很大的困难,致使离心泵设计研究局限在一定程度再难以发展。离心泵研究还有待完善。近年来,随着计算流体力学(CFD)方法的发展,为学者们又提供了一个有力的工具,从研究离心泵流体流动机理出发,数值仿真研究离心泵内部流动特性,离心泵内流动可视化,使用数值仿真所得结果来指导泵的设计已经成为可能且可靠性高。本文基于计算流体动力学理论,运用数值模拟的方法,利用水利机械设计软件CFTurbo构建离心泵的三维模型,再利用CFD软件NUMECA对叶轮流道进行流体动力学数值仿真,用有限体积法对雷诺时均N-S方程进行离散,选用Spalart-Allmaras湍流模型和NUMECA默认的中心差分格式来进行求解及分析。本文又对另4种转速下动叶轮的流场进行数值仿真研究,得到不同转速下的流体在离心泵内的流速和压力分布,及速度场和压力场受转速的影响规律。真实地反映出泵内部的流动情况,揭示离心泵内部流动特征,对探讨影响离心泵效率的原因,提高离心泵的效率,减小离心泵能耗,提供了重要的理论依据。
[Abstract]:Centrifugal pump belongs to the category of general machinery, centrifugal pump is widely used in every link of national economy production, but centrifugal pump has the problem of high energy consumption and low efficiency. Many scholars have studied centrifugal pump for many years.Due to the limitation of research methods and existing scientific theories, the efficiency of centrifugal pump has not been improved significantly.The structure of centrifugal pump is complex and the flow situation of internal flow field is extremely complex. The same complexity of complex mechanism and internal flow field brings great difficulties to the research of centrifugal pump, which limits the research of centrifugal pump design to a certain extent.Centrifugal pump research needs to be improved.In recent years, with the development of computational fluid dynamics (CFD) method, a powerful tool has been provided for scholars to study the fluid flow mechanism of centrifugal pump, numerical simulation to study the internal flow characteristics of centrifugal pump, flow visualization in centrifugal pump.It is possible and reliable to use the numerical simulation results to guide the pump design.The Reynolds time-averaged N-S equation is discretized by the finite volume method. The Spalart-Allmaras turbulence model and the NUMECA's default central difference scheme are used to solve and analyze the equations.In this paper, the numerical simulation of the flow field of the impeller at four other rotational speeds is carried out, and the velocity and pressure distribution of the fluid in the centrifugal pump at different rotational speeds are obtained, as well as the influence of the velocity field and the pressure field on the speed of the centrifugal pump.It can truly reflect the flow inside the pump and reveal the internal flow characteristics of the centrifugal pump. It provides an important theoretical basis for probing into the reasons that affect the efficiency of the centrifugal pump, improving the efficiency of the centrifugal pump and reducing the energy consumption of the centrifugal pump.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH311
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本文编号：1736568