Analysis and Control of Unsteady Three-Dimensional Vortical Flow Structure in Complex Flow Fields

复杂流场非定常三维旋涡流结构分析与控制

• 批准号: 13305014
• 负责人: INOUE Masahiro
• 金额: $ 34.53万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13305014/
• 关键词: Complex Flow; Vortical Flow; Flow Separation; Stall; Vortex Structure; Flow Control; Turbomachinery

A transient flow phenomenon of rotating stall inception in axial flow compressor rotors has been investigated by experimental fluid dynamics(EFD) and computational fluid dynamics(CFD). Instantaneous distributions of the casing wall pressure were obtained experimentally by 'Synchronous Field Measurement' using time interpolation. Unsteady three-dimensional separated and vortical Flow structure was captured by unsteady Navier-Stokes flow simulation. To elucidate the unsteady flow phenomenon at the stall inception, vortex structures and separation topology were identified by the critical point theory.In the axial compressor rotor with small tip clearance, the tip leakage vortex is so weak as to have little influence on the flow field. The leading edge separation dominates the rotating stall inception, which results in the short length-scale rotating stall. A short length-scale stall is of the part-span type occupying only a part of the annulus. Its cell structure consists of the tornado-l … More ike separation vortex linking the blade suction surface and casing wall boundary layers. The tornado-like separation vortex dominating the short length-scale stall cells has a large blockage effect. As the separation vortex grows and moves toward the pressure surface of the neighboring blade, it increases the incidence of the neighboring blade, thus bringing about a new leading edge separation on the neighboring blade. In the case of small clearance, the stall evolution depends on the stator-rotor gap. However, in the case of large clearance, there is little difference of the stall evolution among three gaps. From the measurement of the pressure and velocity field near the stall point, it seems that breakdown of tip leakage vortex occurs in the case of large clearance for three different gaps. It is supported from the axial velocity distribution at the rotor exit. From the pressure field traces just before the stall, we can find the distinctive flow phenomenon like rotating instability. The tip vortex plays a very important role for stall inception. Less

通过实验流体动力学（EFD）和计算流体动力学（CFD）研究了轴流压缩机转子旋转失速的瞬态流动现象，并通过使用时间插值的“同步场测量”实验获得了壳体壁压力的瞬时分布。通过非定常纳维-斯托克斯流模拟捕获非定常三维分离涡流结构，以阐明失速开始时的非定常流动现象。采用临界点理论识别了涡结构和分离拓扑。在小叶顶间隙的轴流压气机转子中，叶顶泄漏涡很弱，对流场的影响很小，前缘分离在旋转失速开始时占主导地位。这导致短长度尺度旋转失速。短长度尺度失速是仅占据环空的一部分的部分跨度类型，其单元结构由龙卷风式分离涡连接组成。叶片吸力面和机壳壁边界层中的龙卷风式分离涡支配着短长度尺度的失速单元，随着分离涡的增长并移向邻近叶片的压力面，它会增加发生率。在小间隙的情况下，失速演化取决于定子-转子间隙，但是在大间隙的情况下，几乎没有差异。三者之间的失速演变从失速点附近的压力和速度场的测量来看，在三种不同间隙的情况下，叶尖泄漏涡的破坏发生在转子出口处的轴向速度分布上。通过观察失速前的压力场轨迹，我们可以发现叶尖涡等独特的流动现象对于失速的发生起着非常重要的作用。

项目成果

Masahiro INOUE: "Vortex Consideration in Turbomachinery"Proceedings of The 2003 ASME/JSME Joint Fluids Engineering Conference. (CD-ROM). (2003)

Masahiro INOUE：“涡轮机械中的涡流考虑”2003 年 ASME/JSME 联合流体工程会议论文集。

Sung-Hyup KIM: "Numerical Analysis of Three-dimensional Vortical Flow Structure in a Propeller Fan"Proc. of the 5th International Symposium between Kyushu Univ. and Chungnam National Univ.. 148-153 (2001)

Sung-Hyup KIM：“螺旋桨式风扇三维涡流结构的数值分析”Proc。

M.INOUE, M.FURUKAWA: "Physics of Tip Clearance Flow in Turbomachinery"Proceedings of 2002 ASME Joint US-European Fluids Engineering Conference, FEDSM. 31184 (2002)

M.INOUE、M.FURUKAWA：“涡轮机械中叶尖间隙流动的物理学”2002 年 ASME 美国-欧洲联合流体工程会议 (FEDSM) 论文集。

Kazutoyo YAMADA: "Numerical Analysis of Rotating Stall Inception in an Axial Compressor Rotor"Proc. of the 5th JSME-KSME Fluids Engineering Conference. 1597-1602 (2002)

Kazutoyo YAMADA：“轴流压缩机转子中旋转失速起始的数值分析”Proc。

Masahiro INOUE: "High-Frequency Instabilities in Axial Flow Compressors"Proceedings of the XI International Symposium on Airbreathing Engine. (CD-ROM). (2001)

Masahiro INOUE：“轴流压缩机中的高频不稳定性”第十一届吸气式发动机国际研讨会论文集。