基于流固耦合的离心泵动力学数值研究

发布时间：2018-06-08 12:38

本文选题：离心泵 + 流固耦合　；参考：《大连交通大学》2012年硕士论文

【摘要】：离心泵是一种通用的流体机械，在实际的工业生产中占有非常重要的地位，特别是在冶金、石油化工、城市供水、然气输送以及农业灌溉中有着非常广泛的应用。在实际运行过程中，离心泵内流场与叶轮之间存在着相互耦合，考虑流固耦合作用的数值模拟能更真实的反映离心泵的流场特征。本文对某一离心泵进行了定常、瞬态及流固耦合分析，获得了离心泵叶片、叶轮及蜗壳等部位的压力及速度分布情况，为离心泵的进一步优化设计提供了数据参考。本文主要研究工作包括： 1.在充分了解流固耦合定义和研究现状、流固耦合交接面处数据传递方法等基础上，利用ANSYS-Workbench软件对离心泵内流场进行详尽的数值模拟。 2.采用κ ε湍流模型对离心泵进行定常数值模拟，模拟分别在设计工况与非设计工况下进行，，得到内流场静压、总压及速度分布图；根据模拟结果所预测的离心泵性能曲线与试验测得的性能曲线吻合良好。 3.以定常分析结果为初始条件，通过滑移网格模型对离心泵进行瞬态数值模拟，得到一个叶片通过周期内压力场、速度场的变化趋势：叶片刚转到隔舌处时，压力值、速度值最小，然后逐渐增大，直到叶片已经划过流道中面时，压力值、速度值达到最大值，然后迅速减小。 4.利用ANSYS Workbench中Transient Structural瞬态分析模块与CFX建立结构场与流体场双向求解过程，得到设计工况下流固耦合前后速度场、压力场随时间的变化情况；通过频谱分析得出：设计工况和大流量工况下各点压力脉动频率以叶片的通过频率为主，约为343Hz。在小流量工况下，低于1倍叶片通过频率（98Hz）的低频脉动占据主导地位。
[Abstract]:Centrifugal pump is a kind of universal fluid machinery, which plays an important role in practical industrial production, especially in metallurgy, petrochemical industry, urban water supply, natural gas transportation and agricultural irrigation. In the actual operation process, there is a mutual coupling between the flow field and impeller in the centrifugal pump, and the numerical simulation considering the fluid-solid coupling can more truly reflect the flow field characteristics of the centrifugal pump. In this paper, the steady, transient and fluid-solid coupling analysis of a centrifugal pump is carried out, and the pressure and velocity distributions of the blade, impeller and volute of the centrifugal pump are obtained. It provides the data reference for the further optimization design of centrifugal pump. The main research work of this paper includes: 1. On the basis of fully understanding the definition and research status of fluid-solid coupling and the method of data transfer at fluid-solid coupling interface, the numerical simulation of flow field in centrifugal pump is carried out by using ANSYS-Workbench software in detail. 2. The steady numerical simulation of centrifugal pump is carried out by using 魏蔚 turbulence model. The static pressure, total pressure and velocity distribution of the internal flow field are obtained under the design and off-design conditions, respectively. The performance curve of centrifugal pump predicted by the simulation results is in good agreement with the experimental results. 3. Taking the results of steady analysis as initial conditions, the transient numerical simulation of centrifugal pump is carried out by sliding grid model, and the variation trend of velocity field of a blade through the pressure field in the period is obtained: when the blade is just transferred to the tongue, the pressure value is obtained. The velocity value is minimum, then increases gradually, until the blade has crossed the middle surface of the runner, the pressure value and velocity value reach the maximum value, and then decrease rapidly. 4. Using transient structural transient analysis module in ANSYS Workbench and CFX to establish bidirectional solution process of structure field and fluid field, the velocity field and pressure field change with time before and after fluid-solid coupling under design condition are obtained. The frequency of pressure pulsation at each point is mainly the passing frequency of the blade, which is about 343Hz under the design condition and the large flow condition by spectrum analysis. Under the condition of small flow rate, the low frequency pulsation of less than 1 times blade passing through frequency of 98 Hz is dominant.
【学位授予单位】：大连交通大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311

【引证文献】