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<p>The article considers the sources of hydraulically induced dynamic loading on the structural components of a Francis turbine. The primary focus is on the most dangerous dynamic load caused by vortex phenomena in the draft tube. Such phenomena emerge when Francis turbines operate in suboptimal modes due to the distinctive features of their working process and generate strong low-frequency pressure pulsations. These fluctuations can involve the entire water mass in the penstock-turbine system. Such pulsations are the reason for limiting the operating range of a radial-axial water turbine. The article discusses modern methods for reducing low-frequency pressure pulsations in order to expand the range of operating modes for both in-service and newly designed Francis turbines.</p>

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Flow Path Investigation Aimed at Reducing Dynamic Load and Expanding the Operating Range of a Francis Turbine

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Yu. V. Babachenko,
  • V. E. Rigin,
  • A. S. Ustimenko,
  • I. A. Germanova,
  • V. N. Seleznev

摘要

The article considers the sources of hydraulically induced dynamic loading on the structural components of a Francis turbine. The primary focus is on the most dangerous dynamic load caused by vortex phenomena in the draft tube. Such phenomena emerge when Francis turbines operate in suboptimal modes due to the distinctive features of their working process and generate strong low-frequency pressure pulsations. These fluctuations can involve the entire water mass in the penstock-turbine system. Such pulsations are the reason for limiting the operating range of a radial-axial water turbine. The article discusses modern methods for reducing low-frequency pressure pulsations in order to expand the range of operating modes for both in-service and newly designed Francis turbines.