Scholarlink

<p>Tip leakage loss is a significant source of aerodynamic loss in the&#xa0;turbine rotor and can be controlled by using a&#xa0;cavity tip. In this paper, three configurations with cutback rims are numerically investigated to control the formation and development of vortices in the tip region. The results indicate that the suction side cutback squealer tips effectively suppress the development of the upper passage vortex (UPV) and its associated losses. The suction side cutback rim increases the leakage rate and strengthens the leading-edge tip leakage vortex (LTLV), which in turn intensifies the interaction between the LTLV and the UPV, thereby inhibiting the development of the UPV. The pressure side cutback rim has a lesser impact on the LTLV but significantly enhances both the tip leakage vortex (TLV) and the UPV, which is unfavorable for controlling local losses in the tip region. When&#xa0;the suction side rim cutback is slightly downstream, it can generate a stronger LTLV for suppressing the development of the UPV. This configuration could effectively reduce the total pressure loss coefficient in the range of 50%–80% span by up to 28%, although it also leads to an increase above 80% span. Overall, the suction side cutback squealer tip could still reduce the average total pressure loss coefficient in the region above 50% span by approximately 5%.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effects of cutback squealer tips on the vortices and local loss in the tip region of axial turbine rotor

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月15日

查看全文
  • Weihao Zhang,
  • Yufan Wang,
  • Kailai Chen,
  • Dongming Huang

摘要

Tip leakage loss is a significant source of aerodynamic loss in the turbine rotor and can be controlled by using a cavity tip. In this paper, three configurations with cutback rims are numerically investigated to control the formation and development of vortices in the tip region. The results indicate that the suction side cutback squealer tips effectively suppress the development of the upper passage vortex (UPV) and its associated losses. The suction side cutback rim increases the leakage rate and strengthens the leading-edge tip leakage vortex (LTLV), which in turn intensifies the interaction between the LTLV and the UPV, thereby inhibiting the development of the UPV. The pressure side cutback rim has a lesser impact on the LTLV but significantly enhances both the tip leakage vortex (TLV) and the UPV, which is unfavorable for controlling local losses in the tip region. When the suction side rim cutback is slightly downstream, it can generate a stronger LTLV for suppressing the development of the UPV. This configuration could effectively reduce the total pressure loss coefficient in the range of 50%–80% span by up to 28%, although it also leads to an increase above 80% span. Overall, the suction side cutback squealer tip could still reduce the average total pressure loss coefficient in the region above 50% span by approximately 5%.