Near-Wall Flow in Turbomachinery Blade Rows

涡轮机械叶片排中的近壁流

基本信息

项目摘要

In the current project , the near-wall flow in turbine and compressor cascades is being investigated fundamentally. The work on turbine cascades has reached a natural end, but based on the results achieved, a number of research questions on flow in compressors have been raised which shall be answered in a two-year continuation phase to clarify important application-relevant aspects of the near-wall flow. While in the current phase the focus was on the single stage, especially the transferability of results for near-wall flow from linear cascades to rotating cascades, and only cylinder wakes were used as a model, this will now be extended to more complex near-wall rotor-stator interaction (RSI). To this end, in the continuation phase the transition to realistic inflow conditions of a real, multi-stage compressor will be accomplished. On one hand, this is done by experimental investigations with a streamlined, non-deflecting wake generator and a downstream rotor as well as considering the third stage of the four-stage low-speed axial compressor. On the other hand, high-resolution Large Eddy Simulations (LES) will be carried out, in which modularly designed inlet conditions specially designed for these configurations allow the effects to be clearly identified. The methodically closely coordinated procedure allows to clarify the role of the individual flow components in the inflow on near-wall flow, secondary flows and loss development in the rotor. A contribution to this is also made by the detailed analysis of the turbulence structure in the flow near the side wall under the influence of RSI. This is achieved by the combined use of wall-resolved LES and an innovative measuring technique, the laser Doppler profile sensor. The third topic is concerned with the transferability of the results obtained so far to off-design conditions, where it is to be expected that the RSI near the wall changes significantly with higher aerodynamic load. Current results also show ist influence on the triggering of rotating stall, i.e. the limitation of the operating range. Here, among other issues, the influence of the radial gap width is to be investigated, especially for large gaps. The work planned for the continuation phase will provide a detailed analysis of the flow near the wall under the influence of RSI and generate an improved physical understanding of fundamental issues, with the long-term vision of achieving a reduction of losses, increase of the efficiency and extension of the stable operating range.
在本项目中,涡轮和压气机叶栅内的近壁流动正在进行基础性的研究。关于涡轮叶栅的工作已经自然结束,但根据所取得的结果,提出了一些关于压缩机内流动的研究问题,这些问题将在两年的延续阶段得到回答,以澄清与近壁流动有关的重要应用方面。而在当前阶段,重点放在单级,特别是近壁流动结果的可转换性,从线性叶栅到旋转叶栅,并且只使用圆柱尾迹作为模型,现在将扩展到更复杂的近壁动静相互作用(RSI)。为此,在继续阶段,将完成向真实的多级压缩机的实际进气条件的过渡。一方面,通过对流线型非偏转尾迹发生器和下游转子的实验研究,以及考虑四级低速轴流压气机的第三级来实现这一点。另一方面,将进行高分辨率大涡模拟(LES),其中专门为这些构型设计的模块设计的入口条件允许清楚地识别影响。这一有条不紊的协调程序使我们能够弄清流入中的各个流动成分对转子内的近壁流动、二次流动和损失发展的作用。通过对RSI影响下侧壁附近流动的湍流结构的详细分析,也对此做出了贡献。这是通过结合使用壁分辨LES和一种创新的测量技术--激光多普勒轮廓传感器来实现的。第三个主题涉及到到目前为止所获得的结果在非设计条件下的可转换性,在非设计条件下,预计壁面附近的RSI随着更高的气动载荷而发生显著变化。目前的结果也显示了旋转失速触发的影响,即工作范围的限制。在这里,除了其他问题外,还需要研究径向间隙宽度的影响,特别是对于大间隙。继续阶段计划的工作将详细分析受RSI影响的壁面附近的流动,并增进对基本问题的物理理解,以实现减少损失、提高效率和扩大稳定运行范围的长期愿景。

项目成果

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Professor Dr.-Ing. Jochen Fröhlich其他文献

Professor Dr.-Ing. Jochen Fröhlich的其他文献

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{{ truncateString('Professor Dr.-Ing. Jochen Fröhlich', 18)}}的其他基金

Numerical investigation of the influence of the tip clearance flow and the Coriolis force on the near wal flow in a compressor stage
压气机级叶顶间隙流和科里奥利力对近鲸流影响的数值研究
  • 批准号:
    365409499
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Experiments and simulations for the study of submerged aquatic canopies consisting of long flexible blades
由长柔性叶片组成的水下水生冠层研究的实验和模拟
  • 批准号:
    316798177
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Entwicklung numerischer Modelle zur Vorhersage kavitationsbedingter Geräusche und Erosion in Hydraulikventilen mittels LES
使用 LES 开发数值模型来预测液压阀中与气蚀相关的噪声和腐蚀
  • 批准号:
    175375325
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Research Grants
LES and DNS of the unsteady interaction of secondary flows in turbomachnine grids
涡轮机网格中二次流非定常相互作用的LES和DNS
  • 批准号:
    165216121
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Research Grants
High resolution numerical and experimental studies of turbulence-induced sediment erosion and near-bed transport
湍流引起的沉积物侵蚀和近床输送的高分辨率数值和实验研究
  • 批准号:
    125500987
  • 财政年份:
    2009
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Large Eddy Simulation mit adaptiven bewegten Gittern zur Lösung meteorologischer Fragestellungen
使用自适应移动网格的大涡模拟解决气象问题
  • 批准号:
    42390337
  • 财政年份:
    2007
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
LES-RANS coupling for the simulation of complex flows
用于模拟复杂流动的 LES-RANS 耦合
  • 批准号:
    5405882
  • 财政年份:
    2003
  • 资助金额:
    --
  • 项目类别:
    Research Units
Experimental and scale resolving numerical investigations of the physical performance of circumferential grooves in subsonic axial compressor stages
亚音速轴流压气机级圆周槽物理性能的实验和规模解析数值研究
  • 批准号:
    500054096
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Rotor cooling of low-inertia induction machines for highly dynamic applications
适用于高动态应用的低惯量感应电机的转子冷却
  • 批准号:
    507287551
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants

相似国自然基金

Wall crossing现象和内禀Higgs态
  • 批准号:
    11305125
  • 批准年份:
    2013
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    22.0 万元
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Elucidation of particle behavior in near-wall region of a high-speed particle-laden flow and its modeling toward highly accurate prediction of particle behavior
阐明高速载有颗粒流的近壁区域中的颗粒行为及其对颗粒行为进行高精度预测的建模
  • 批准号:
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Development of 3D-BOS using Mirror for three-dimensional flow field measurement near a wall
开发利用Mirror进行近壁三维流场测量的3D-BOS
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    20K14645
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Relationship between micelle structure and near-wall turbulence in surfactant drag-reduced flow
表面活性剂减阻流动中胶束结构与近壁湍流的关系
  • 批准号:
    20K04271
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    2020
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    --
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    Grant-in-Aid for Scientific Research (C)
Experimental Measurement of Thermal Flow Field in Near-wall Region for Development of Microparticle Manipulation Technique Using Evanescent Wave
近壁区域热流场的实验测量,用于发展倏逝波微粒操纵技术
  • 批准号:
    18K13701
  • 财政年份:
    2018
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Elucidation of the Mechanism of a Ciliate Swimming: Near a Wall and Under Shear Flow
阐明纤毛虫游泳的机制:靠近墙壁和剪切流
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Developmental Mechanism of the Critical Heat Flux in Subcooled Flow Boiling - Research on the Vapor-Liquid Structure in the Near Wall Region
过冷流动沸腾临界热通量的发展机制——近壁区汽液结构研究
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    17K06217
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Creation of functional plates for control of two-phase flow and heat transfer, and development of an approach for control of near-wall bubble behavior
创建用于控制两相流和传热的功能板,并开发控制近壁气泡行为的方法
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Clarification of fluid dynamical effect of near-wall flow field on enrtherial cell damage by measurement-integrated-simulation
测量-集成-模拟阐明近壁流场对热细胞损伤的流体动力学效应
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More efficient electrochemical energy conversion through near-wall flow control
通过近壁流量控制实现更高效的电化学能量转换
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Development of an Advanced Turbulence Model for Unsteady Complex Turbulent Flow Fields Considering the Characteristics of Near-Wall Turbulent Vortex Structures
考虑近壁湍流涡结构特征的非定常复杂湍流场高级湍流模型的建立
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