基于CFD的离心泵内部三维流场的数值模拟研究

发布时间：2018-06-30 19:09

本文选题：离心泵 + 数值模拟　；参考：《昆明理工大学》2017年硕士论文

【摘要】：离心泵作为一种使用比较广泛的流体机械、广泛用于工业生产和日常生活中。离心泵的效率的提高会减少社会对能源需求的压力。随着计算机技术的快速发展,利用FLUENT实现离心泵的内部流场数值模拟为了解和掌握离心泵复杂的内部流动开辟了新的途径,弥补了传统设计方法的不足,对离心泵的优化设计、水力性能的改善、提高其效率具有非常重要的意义。本文首先采用Pro/E软件建立离心泵的三维实体模型,然后采用计算流体动力学软件FLUENT对IS型离心泵进行内部流场的数值模拟,得到不同工况下离心泵内部流场不同时刻的速度分布和压力分布,分析了离心泵内部的流动规律,并进行性能预测。通过计算结果与实验结果的比较验证该方法计算离心泵内部流动的可行性和正确性。本文主要作了以下几方面的研究工作:(1)介绍了离心泵内部流场数值模拟的国内外发展研究现状及商用CFD软件的发展,从控制方程、湍流模型问题的提出及解决方法、湍流模型的后处理等多方面介绍了湍流流动数值模拟理论。(2)介绍了计算流体动力学的基本理论知识,阐述了流体与流动的基本特性,给出了流体动力学的基本控制方程。(3)利用Pro/E软件对IS型离心泵过流部件进行实体造型,建立离心泵的三维实体模型。(4)介绍了 FLUENT环境下离心泵的数值计算过程,应用MRF法对离心泵内部湍流流动进行定常数值模拟,获得了不同工况下各个过流部件的速度和压力分布,揭示了泵内部流动规律。(5)使用了 FLUENT中的多相流理论模拟了固液两相流状态时分别从颗粒直径与固相浓度两个因素对离心泵内压力、速度及固相浓度分布的影响进行模拟分析并计算不同固相浓度对泵扬程和效率的影响。总结得出泵内主要磨损主要部位在蜗壳近壁面端及蜗壳隔舌处,叶轮进口叶片工作面侧的结论。为以后对离心泵磨损机理研究及离心泵结构选型和优化提供了相应的理论数据基础。
[Abstract]:As a widely used fluid machine, centrifugal pump is widely used in industrial production and daily life. The efficiency of centrifugal pumps will reduce the pressure on energy demand. With the rapid development of computer technology, using fluent to realize the numerical simulation of internal flow field of centrifugal pump has opened up a new way to understand and master the complex internal flow of centrifugal pump, which makes up for the deficiency of traditional design method, and optimizes the design of centrifugal pump. The improvement of hydraulic performance and the improvement of its efficiency are of great significance. In this paper, the three-dimensional solid model of centrifugal pump is established by Prop / E software, and then the internal flow field of is centrifugal pump is simulated by computational fluid dynamics software fluent. The velocity distribution and pressure distribution of the flow field in the centrifugal pump at different working conditions are obtained. The flow law in the centrifugal pump is analyzed and the performance prediction is carried out. The feasibility and correctness of the method for calculating the flow inside the centrifugal pump are verified by comparing the calculated results with the experimental results. The main work of this paper is as follows: (1) the development of numerical simulation of flow field in centrifugal pump at home and abroad and the development of commercial CFD software are introduced. The theory of numerical simulation of turbulent flow is introduced from the post-processing of turbulence model. (2) the basic theoretical knowledge of computational fluid dynamics and the basic characteristics of fluid and flow are introduced. The basic governing equations of fluid dynamics are given. (3) the solid modeling of the flow passing parts of is type centrifugal pump is carried out by using Prop / E software, and the three-dimensional solid model of the centrifugal pump is established. (4) the numerical calculation process of centrifugal pump under fluent environment is introduced. The steady numerical simulation of turbulent flow in centrifugal pump is carried out by using MRF method, and the velocity and pressure distribution of each overflowing part under different working conditions is obtained. (5) the multiphase flow theory in fluent is used to simulate the pressure in the centrifugal pump from two factors of particle diameter and solid concentration, respectively, when the solid-liquid two-phase flow is in the state of solid-liquid two-phase flow. The effects of velocity and solid concentration distribution on pump lift and efficiency were simulated and analyzed. It is concluded that the main wear parts of the pump are near the wall of the volute and the tongue of the volute and the face side of the impeller inlet blade. It provides a theoretical basis for the research of centrifugal pump wear mechanism and the selection and optimization of centrifugal pump structure.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH311

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