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首页> 外文学位 >Active identification and control of aerodynamic instabilities in axial and centrifugal compressors.
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Active identification and control of aerodynamic instabilities in axial and centrifugal compressors.

机译：主动识别和控制轴向和离心式压缩机的空气动力学不稳定性。

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摘要

In this thesis, it is experimentally shown that dynamic cursors to stall and surge exist in both axial and centrifugal compressors using the experimental axial and centrifugal compressor rigs located in the School of Aerospace Engineering at the Georgia Institute of Technology. Further, it is shown that the dynamic cursors to stall and surge can be identified in real-time and they can be used in a simple control scheme to avoid the occurrence of stall and surge instabilities altogether.; For the centrifugal compressor, a previously developed real-time observer is used in order to detect dynamic cursors to surge in real-time. An off-line analysis using the Fast Fourier Transform (FFT) of the open loop experimental data from the centrifugal compressor rig is carried out to establish the influence of compressor speed on the dynamic cursor frequency. The variation of the amplitude of dynamic cursors with compressor operating condition from experimental data is qualitatively compared with simulation results obtained using a generic compression system model subjected to white noise excitation. Using off-line analysis results, a simple control scheme based on fuzzy logic is synthesized for surge avoidance and recovery. The control scheme is implemented in the centrifugal compressor rig using compressor bleed as well as fuel flow to the combustor. Closed loop experimental results are obtained to demonstrate the effectiveness of the controller for both surge avoidance and surge recovery.; The existence of stall cursors in an axial compression system is established using the observer scheme from off-line analysis of an existing database of a commercial gas turbine engine. However, the observer scheme is found to be ineffective in detecting stall cursors in the experimental axial compressor rig in the School of Aerospace Engineering at the Georgia Institute of Technology. An alternate scheme based on the amplitude of pressure data content at the blade passage frequency obtained using a pressure sensor located (in the casing) over the blade row is developed and used in the axial compressor rig for stall and surge avoidance and recovery. (Abstract shortened by UMI.)
机译：本文通过实验证明，使用位于佐治亚理工学院航空工程学院的实验轴向和离心压缩机装置，在轴向和离心压缩机中都存在动态游标，以防止失速和喘振。此外，示出了可以实时识别失速和喘振的动态光标，并且可以将它们用在简单的控制方案中以完全避免发生失速和喘振的不稳定性。对于离心压缩机，使用以前开发的实时观察器以检测动态光标以实时波动。使用快速傅立叶变换（FFT）对来自离心式压缩机设备的开环实验数据进行离线分析，以确定压缩机速度对动态光标频率的影响。定性地将动态游标的幅度随压缩机工作条件的变化与实验数据进行比较，并将其与使用受白噪声激励的通用压缩系统模型获得的模拟结果进行比较。利用离线分析结果，综合了一种基于模糊逻辑的简单控制方案，用于避雷和恢复。该控制方案在离心式压缩机装置中使用压缩机放气以及流向燃烧室的燃料进行实施。获得闭环实验结果，以证明控制器在避免电涌和恢复电涌方面的有效性。通过对商用燃气涡轮发动机的现有数据库进行离线分析，使用观察者方案建立了轴向压缩系统中失速光标的存在。但是，在佐治亚理工学院航空工程学院，发现观测器方案在检测实验性轴向压缩机装置中的失速光标方面无效。基于使用位于叶片行上方（位于壳体中）的压力传感器获得的叶片通过频率下的压力数据内容的幅度，开发了另一种方案，并将其用于轴向压缩机装置中，以防止失速和喘振。 （摘要由UMI缩短。）

著录项

  • 作者

    Krichene, Assad.;

  • 作者单位

    Georgia Institute of Technology.;

  • 授予单位 Georgia Institute of Technology.;
  • 学科 Engineering Aerospace.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 136 p.
  • 总页数 136
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 航空、航天技术的研究与探索;
  • 关键词

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