Efforts to increase individual blade loading in the low pressure turbine have resulted in blade geometries optimized for midspan performance. Many researchers have shown that increased blade loading and a front-loaded pressure distribution each contribute separately to increased losses in the endwall region. A detailed investigation is performed of the baseline endwall flow of the L2F profile, a high-lift, front loaded profile. In-plane velocity vectors and total pressure loss maps are obtained in five planes oriented normal to the blade surface, for three Reynolds numbers. A row of pitched and skewed jets are introduced near the endwall on the suction surface of the blade. The flow control method is evaluated for four momentum coefficients at the high Reynolds number, with a maximum reduction of 42% in the area averaged total pressure loss coefficient. The same blade is also fitted with midspan vortex-generator jets and is tested at a Reynolds number of 20,000, resulting in a 21% reduction in area averaged total pressure loss.
Secondary Flow Loss Reduction Through Blowing for a High-Lift Front-Loaded Low Pressure Turbine Cascade
- Views Icon Views
- Share Icon Share
- Search Site
Benton, S, Bons, JP, & Sondergaard, R. "Secondary Flow Loss Reduction Through Blowing for a High-Lift Front-Loaded Low Pressure Turbine Cascade." Proceedings of the ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. Volume 8: Turbomachinery, Parts A, B, and C. Copenhagen, Denmark. June 11–15, 2012. pp. 1217-1227. ASME. https://doi.org/10.1115/GT2012-68812
Download citation file: