scholarly journals Numerical investigation of particle deposition in film-cooled blade leading edge

2020 ◽  
Vol 77 (6) ◽  
pp. 579-598 ◽  
Author(s):  
Jin Wang ◽  
Ke Tian ◽  
Hengxuan Zhu ◽  
Min Zeng ◽  
Bengt Sundén
Keyword(s):  
Numerical Investigation ◽  
Particle Deposition ◽  
Leading Edge ◽  
Cooled Blade ◽  
Blade Leading Edge

scholarly journals Experimental measurements of the flow field around a film-cooled blade leading edge using particle image velocimetry

2018 ◽  
Vol 10 (10) ◽  
pp. 168781401880290
Author(s):  
José Omar Dávalos Ramírez ◽  
Juan Carlos García Castrejón ◽  
Francisco Carrillo Pereyra ◽  
Carlos Ponce Corral ◽  
Carlos Felipe Ramírez Espinoza ◽  
...  
Keyword(s):  
Particle Image Velocimetry ◽  
Flow Field ◽  
Particle Image ◽  
Leading Edge ◽  
Cooling Flow ◽  
Image Velocimetry ◽  
Secondary Vortices ◽  
Velocity Turbulence ◽  
Cooled Blade ◽  
Blade Leading Edge

In this article, particle image velocimetry studies were conducted in a low-speed wind tunnel to investigate the effects of blowing ratio and blade span in terms of the characteristics of the flow field around a film-cooled blade leading edge. The measurements were performed at 20%, 40%, 60%, and 80% of blade span and blowing ratios of M = 0.5, M = 0.75, M = 1, M = 1.5, and M = 2. Velocity, turbulence intensity, and structure of vortices during the interaction between cooling flow and mainstream were analyzed in detail. The analysis shows a significant increase in mainstream velocity at low blowing ratios, M < 1. Peaks of turbulence were observed at low- and high-span locations. Aerodynamical losses are expected at higher blowing ratios due to the formation of secondary vortices near the outgoing jet. These vortices were a consequence of velocity gradients at this zone.

Numerical investigation of mist/air impingement cooling on ribbed blade leading-edge surface

2017 ◽  
Vol 203 ◽  
pp. 1062-1071 ◽  
Author(s):  
Qingfei Bian ◽  
Jin Wang ◽  
Yi-tung Chen ◽  
Qiuwang Wang ◽  
Min Zeng
Keyword(s):  
Numerical Investigation ◽  
Leading Edge ◽  
Impingement Cooling ◽  
Air Impingement ◽  
Edge Surface ◽  
Blade Leading Edge

scholarly journals Numerical Investigation of Two Double Swirl/Vortex Chamber Configurations for Turbine Blade Leading Edge Cooling

2021 ◽  
Vol 25 (12) ◽  
pp. 63-80
Author(s):  
Pipat Tansakul ◽  
Thanabodee Sinpo ◽  
Phongsakorn Thawornsathit ◽  
Varangrat Juntasaro ◽  
Ekachai Juntasaro
Keyword(s):  
Numerical Investigation ◽  
Turbine Blade ◽  
Leading Edge ◽  
Vortex Chamber ◽  
Blade Leading Edge

Numerical Investigation of Passive Flow Control Using Wavy Blades in a Highly-Loaded Compressor Cascade

2018 ◽  
Author(s):  
Bo Wang ◽  
Yanhui Wu ◽  
Kai Liu
Keyword(s):  
Numerical Investigation ◽  
Flow Structure ◽  
Cross Flow ◽  
Leading Edge ◽  
Control Flow ◽  
Streamwise Vortices ◽  
Compressor Cascade ◽  
Control Effect ◽  
Suction Surface ◽  
Highly Loaded

Driven by the need to control flow separations in highly loaded compressors, a numerical investigation is carried out to study the control effect of wavy blades in a linear compressor cascade. Two types of wavy blades are studied with wavy blade-A having a sinusoidal leading edge, while wavy blade-B having pitchwise sinusoidal variation in the stacking line. The influence of wavy blades on the cascade performance is evaluated at incidences from −1° to +9°. For the wavy blade-A with suitable waviness parameters, the cascade diffusion capacity is enhanced accompanied by the loss reduction under high incidence conditions where 2D separation is the dominant flow structure on the suction surface of the unmodified blade. For well-designed wavy blade-B, the improvement of cascade performance is achieved under low incidence conditions where 3D corner separation is the dominant flow structure on the suction surface of the baseline blade. The influence of waviness parameters on the control effect is also discussed by comparing the performance of cascades with different wavy blade configurations. Detailed analysis of the predicted flow field shows that both the wavy blade-A and wavy blade-B have capacity to control flow separation in the cascade but their control mechanism are different. For wavy blade-A, the wavy leading edge results in the formation of counter-rotating streamwise vortices downstream of trough. These streamwise vortices can not only enhance momentum exchange between the outer flow and blade boundary layer, but also act as the suction surface fence to hamper the upwash of low momentum fluid driven by cross flow. For wavy blade-B, the wavy surface on the blade leads to a reduction of the cross flow upwash by influencing the spanwise distribution of the suction surface static pressure and guiding the upwash flow.

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