Analysis of clearance flow of a fuel pump based on dynamical mode decomposition

IF 2.5 3区 工程技术
Wei-long Guang, Qiang Liu, Fa-ye Jin, Ran Tao, Ruo-fu Xiao
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引用次数: 0

Abstract

The flow field structure within the clearances of turbomachinery is complex and diverse, exhibiting high-dimensional nonlinearity. How to accurately extract the main structures that affect the internal flow within the turbine from the complex clearance flow has always been a key issue. To explore the impact of the dynamic structure of the clearance flow on the mainstream region in a centrifugal pump, this study combines the dynamic mode decomposition (DMD) method to conduct a thorough analysis of the velocity and pressure pulsation frequencies in the multi-physics fields within the clearance. The study has identified the main characteristic structures under different physical conditions in the clearance and has established the relationship between the characteristic structure frequencies in different physical fields and the impeller frequency. The research indicates that the internal flow within the clearance affects the occurrence of vortices in the volute. Under design conditions, the velocity field within the clearance is primarily influenced by high-order harmonic frequencies of the impeller, and the pressure field is mainly affected by low-order harmonic frequencies of the impeller. This reflects the crucial influence of impeller frequency and inlet flow on the coherent structures within the clearance flow. The research results offer new insights and methods for analyzing complex internal flows in large turbomachinery.

基于动力学模式分解的燃油泵间隙流分析
透平机械间隙内的流场结构复杂多样,呈现出高维非线性特征。如何从复杂的间隙流中准确提取影响涡轮机内部流动的主要结构一直是一个关键问题。为了探索间隙流动态结构对离心泵主流区的影响,本研究结合动态模态分解(DMD)方法,对间隙内多物理场的速度和压力脉动频率进行了深入分析。研究确定了间隙内不同物理条件下的主要特征结构,并建立了不同物理场中的特征结构频率与叶轮频率之间的关系。研究表明,间隙内的内部流动会影响涡流在涡槽中的出现。在设计条件下,间隙内的速度场主要受叶轮高阶谐波频率的影响,而压力场主要受叶轮低阶谐波频率的影响。这反映了叶轮频率和入口流量对间隙流内相干结构的重要影响。研究成果为分析大型透平机械的复杂内部流动提供了新的见解和方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
自引率
12.00%
发文量
2374
审稿时长
4.6 months
期刊介绍: Journal of Hydrodynamics is devoted to the publication of original theoretical, computational and experimental contributions to the all aspects of hydrodynamics. It covers advances in the naval architecture and ocean engineering, marine and ocean engineering, environmental engineering, water conservancy and hydropower engineering, energy exploration, chemical engineering, biological and biomedical engineering etc.
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