One-Dimensional Analysis of Over Load Draft Tube Surge

• CHEN Changkun

  大阪大学　大学院　基礎工学研究科

• NICOLET Christophe

  Ecole Polytechnique Fédérale de Lausanne

• YONEZAWA Koichi

  大阪大学

• TSUJIMOTO Yoshinobu

  大阪大学

• FARHAT Mohamed

  Ecole Polytechnique Fédérale de Lausanne

• AVELLAN Francois

  Ecole Polytechnique Fédérale de Lausanne

Bibliographic Information

Other Title

• 過負荷運転点におけるドラフトチューブサージの１次元解析
• カフカ ウンテンテン ニ オケル ドラフト チューブ サージ ノ 1ジゲン カイセキ

Abstract

One-dimensional stability analysis of a hydraulic system composed of a penstock, a runner and a draft tube was carried out to determine the cause of the full load draft tube surge. It is assumed that the cavity volume at the runner exit is a function of the pressure at the vortex core evaluated from the instantaneous local pressure at the runner exit and an additional pressure decrease due to the centrifugal force on the swirling flow. It was found that the diffuser effect of the draft tube has a destabilizing effect over all flow rates while the swirl effects stabilize / destabilize the system at larger / smaller flow rates than the swirl free flow rate. Explanations of the destabilizing mechanism are given for the diffuser and swirl flow effects.

Journal

• Turbomachinery

  Turbomachinery 36 (6), 351-358, 2008

  Turbomachinery Society of Japan

Keywords

• Draft Tube Surge
• Water Turbine
• Cavitation
• Diffuser Effect
• Swirl Flow

Details

• CRID: 1390282679521214720
• NII Article ID: 10021103803
• NII Book ID: AN00004836
• DOI: 10.11458/tsj.36.351
• ISSN: 18802338
• ISSN: 03858839
• NDL BIB ID: 9520224
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9520224
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
• Abstract License Flag: Disallowed