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An experimental method for squealer tip flow field considering relative casing motion

Chinese Journal of Aeronautics 2020年第7期33卷 1942-1952页

作者： Fei ZENG Jinlin DU Lin HUANG Liming XUAN Qiang ZHAO Zhengping ZOU National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics School of Energy&Power EngineeringBeihang UniversityBeijing 100083China Collaborative Innovation Center for Advanced Aero-Engine School of Energy&Power EngineeringBeihang UniversityBeijing 100083China

Squealer tip is widely used in turbines to reduce tip leakage *** typical turbine environment,the squealer tip leakage flow is affected by multiple factors such as the relative casing motion and the wide range of variable incidence *** development of experimental methods which can accurately model the real turbine environment and influencing factors is of great significance to study the squealer tip leakage flow *** the present paper,a low-speed turbine cascade test facility which can model the relative casing motion and wide range of variable incidence angles(-25°to 55°)is *** on the similarity criteria,a high-low speed similarity transformation method of the turbine cascade is established by considering the thickness of the turbine blade.A combined testing method of Particle Image Velocimetry(PIV)and local pressure measurement is proposed to obtain the complex flow structures within the tip *** results show that the experimental method can successfully model the relative casing motion and the wide range of variable incidence *** low-speed cascade obtained by the similarity transformation can model the high-speed flow *** measurement technique developed can obtain the complex flow field and successfully capture the scraping vortex within the squealer tip.

关键词： Blade tip/casing gap measurement Particle Image Velocimetry(PIV) Relative casing motion Similarity transformation Turbine wide range of variable incidence angles

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