有叶顶间隙的涡轮弯叶栅拓扑与旋涡结构(Ⅰ)——试验模型、端壁与叶片表面拓扑结构

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基金项目: 国家教委博士点基金资助项目(EDAF24403003)

Topology and Vortex Structures of a Curving Turbine Cascade With Tip Clearance (Ⅰ)-Experimental Model and Topological Flow Patterns on Both Endwalls and Blade Surfaces

Academy of Energy Science and Engineering, Harbin Instiute of Technology, P.O.Box 458, Harbin 150001, P.R.China

摘要: 根据具有叶顶间隙的直叶栅和正、反弯叶栅壁面流动的墨迹显示以及横截面内气动参数测量,应用拓扑学原理,分析了端壁与叶片表面拓扑结构。与直叶栅比较,叶片正弯消除了上通道涡分离线,并使二次涡由闭式分离转变为开式分离,而叶片反弯仅影响奇点位置、旋涡强度与尺度。
- 涡轮叶栅 /
- 叶顶间隙 /
- 弯叶栅 /
- 端壁与叶片表面 /
- 拓扑结构
Abstract: By means of ink trace visualization of the flows in conventional straight,positively curved and negatively curved cascades with tip clearance,and measurement of the aerodynamic parameters in the transverse section,and by appling topology theory,the structures on both endwalls and blade surfaces were analyzed.Compared with conventional straight cascade,blade positive curving eliminates the separation line of the upper passage vortex and leads the secondary vortex to change from close separation to open separation,while blade negative curving effects merely the positions of singular points and the intensities and scales of vortex.
- turbine cascade /
- tip clearance /
- curving cascade /
- endwall and surface /
- topological structure

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