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首页> 外文期刊>Journal of aerospace engineering >Influence of the Upstream Wakes on the Boundary Layer of a High-Lift Low-Pressure Turbine at Positive Incidence
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Influence of the Upstream Wakes on the Boundary Layer of a High-Lift Low-Pressure Turbine at Positive Incidence

机译：上游唤醒对阳性发病率的高升降低压汽轮机边界层的影响

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摘要

The wake-induced transition, natural transition, and instability induced by the Klebanoff streaks complicate the transition process. In this paper, the boundary layer on the suction surface of a high-lift low-pressure turbine (LPT) was investigated at the design and +10 degrees incidence with upstream wakes under numerical simulations and experiments. The interactions between the wakes and boundary on the leading edge of the blade at two incidences are mainly discussed. A positive incidence gives rise to an adverse pressure gradient (APG) over the forward suction surface. The adverse pressure gradient enhances the shear sheltering effect and, as a result, reduces penetration. However, strong Klebanoff streaks are amplified by the APG at +10 degrees incidence and experience a weak viscous decay due to the moderately favorable pressure gradient (FPG). Between the wake passing events, weak Klebanoff streaks are also amplified by the APG at +10 degrees incidence but barely amplified at 0 degrees incidence. Klebanoff streaks appear almost in the whole wake passing cycle, resulting in an earlier transition onset and a longer transition process at +10 degrees incidence. (c) 2020 American Society of Civil Engineers.
机译：Klebanoff条纹引起的唤醒过渡，自然过渡和不稳定性使转变过程复杂化。本文在数值模拟和实验下，在设计中研究了高升降低压涡轮机（LPT）的吸入表面上的边界层，在上游唤醒和上游唤醒。主要讨论了锯和边界之间的相互作用在两个发件发出刀片前缘。正发射产生前向吸入表面上的不利压力梯度（APG）。不利的压力梯度增强了剪切保护效果，结果减少了渗透。然而，通过APG在+10度的发病率下放大强烈的klebanoff条纹，并且由于中等良好的压力梯度（FPG）而经历弱粘性衰减。在唤醒传递事件之间，弱klebanoff条纹也被APG扩增，APG在+ 10度入射，但在0度的入射下几乎放大。 KLEBANOFF条纹几乎在整个尾啸传递周期中出现，导致早期的过渡发作和+ 10度的较长过渡过程。 （c）2020年美国土木工程师协会。

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  • 来源
    《Journal of aerospace engineering》 |2020年第6期|04020077.1-04020077.13|共13页
  • 作者

    Sun Shuang; Tan Tianrong; Wu Xingshuang; Lu Xingen; Zhang Yanfeng; Zhu Junqiang;

  • 作者单位

    Civil Aviat Univ China Dept Aviat Engn Tianjin Key Lab Airworthiness & Maintenance Civil 2898 Jinbei Rd Tianjin 300300 Peoples R China;

    Civil Aviat Univ China Dept Aviat Engn Tianjin Key Lab Airworthiness & Maintenance Civil 2898 Jinbei Rd Tianjin 300300 Peoples R China;

    Civil Aviat Univ China Dept Aviat Engn Tianjin Key Lab Airworthiness & Maintenance Civil 2898 Jinbei Rd Tianjin 300300 Peoples R China;

    Chinese Acad Sci Lab Light Duty Gas Turbine Inst Engn Thermophys 11 Beisihuanxi Rd Beijing 100190 Peoples R China;

    Chinese Acad Sci Lab Light Duty Gas Turbine Inst Engn Thermophys 11 Beisihuanxi Rd Beijing 100190 Peoples R China;

    Chinese Acad Sci Lab Light Duty Gas Turbine Inst Engn Thermophys 11 Beisihuanxi Rd Beijing 100190 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Boundary layers; Upstream wakes; Shear sheltering; Klebanoff streaks; Secondary instability;

    机译：边界层;上游醒来;剪切避风;KlebanOff条纹;次要不稳定;

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