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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Measurement and Prediction of Centrifugal Compressor Axial Forces During Surge-Part II: Dynamic Surge Model
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Measurement and Prediction of Centrifugal Compressor Axial Forces During Surge-Part II: Dynamic Surge Model

机译：喘振期间离心压缩机轴向力的测量和预测-第二部分：动态喘振模型

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摘要

The force acting on centrifugal compressors is an important parameter to be considered throughout the operating life of these turbomachines. When the compressor is operating in surge conditions, these forces can become highly dangerous for the mechanical and aerodynamic structures. This instability is usually avoided in industrial applications, but the antisurge system may not react in time when emergency shutdowns or power failures take place. During these rapid transients, surge can develop, generating unsteady forces which can harm the close clearance components of the compressor. Therefore, the capability to predict the characteristics and the dynamics of these surge forces would allow the estimation of the off-design fatigue cycles produced on these components by surge. Currently, no validated method exists to predict the frequency and amplitude of the surge forces and determine the potential damage of these components. In this paper, a lumped parameter model, developed by using the bond graph approach to predict the dynamic surge fluid-dynamic oscillations, is presented. The model requires the geometry and the steady-state performance maps of the compressor as inputs, together with the piping system configuration characteristics. The simulator is provided with a supplementary tool to estimate the axial force frequency and amplitude, taking into consideration all the contributions to the axial fluid-dynamic thrust, the stiffness-damping of the thrust bearing, and the mass of the rotor. The model was tuned and validated using the test case axial force data from the Southwest Research Institute (SWRI) facility. The model has shown good agreement with the experimental results which implies that it can offer significant information about the severity of a surge event and the quantification of the machine performance losses together with possible damage to the close clearance components. This study is a first important step that can lead to schedule optimization for maintenance and repair activities.
机译：作用在离心压缩机上的力是在这些涡轮机的整个使用寿命中要考虑的重要参数。当压缩机在喘振条件下运行时，这些力对于机械和空气动力学结构会变得非常危险。通常在工业应用中避免这种不稳定性，但是当紧急关闭或电源故障时，防喘振系统可能无法及时做出反应。在这些快速瞬变期间，可能会产生喘振，产生不稳定的力，从而可能损坏压缩机的紧密间隙组件。因此，预测这些喘振力的特性和动态的能力将允许估计由喘振在这些部件上产生的非设计疲劳周期。当前，尚无经过验证的方法来预测喘振力的频率和幅度并确定这些组件的潜在损坏。本文提出了一种通过使用键合图方法来预测动态喘振流体动力振荡的集总参数模型。该模型需要将压缩机的几何形状和稳态性能图作为输入，以及管道系统的配置特征。该模拟器配备有一个辅助工具，可以估算轴向力的频率和振幅，并考虑到对轴向流体动力推力，推力轴承的刚度阻尼和转子质量的所有贡献。使用西南研究所（SWRI）设施的测试案例轴向力数据对模型进行了调整和验证。该模型与实验结果显示出良好的一致性，这意味着它可以提供有关喘振事件的严重性，机器性能损失的量化以及对紧密间隙部件可能造成损害的重要信息。这项研究是第一步，可以导致维护和维修活动的时间表最优化。

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  • 来源
    《Journal of Engineering for Gas Turbines and Power》 |2018年第1期|012602.1-012602.13|共13页
  • 作者

    Enrico Munari; Mirko Morini; Michele Pinelli; Klaus Brun; Sarah Simons; Rainer Kurz;

  • 作者单位

    Mechanical Engineering Department, Universita degli Studi di Ferrara, Ferrara 44121, Italy;

    Mechanical Engineering Department, Universita degli Studi di Parma, Parma 43121, Italy;

    Mechanical Engineering Department, Universita degli Studi di Ferrara, Ferrara 44121, Italy;

    Southwest Research Institute, San Antonio, TX 78238;

    Southwest Research Institute, San Antonio, TX 78238;

    Solar Turbines Incorporated, San Diego, CA 92123;

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