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SUMMARY:Rough-Ribbed Surfaces to Mitigate Losses in High Lift Low-Pressure
  Turbines - Dr. Nagabhushana Rao Vadlamani\, Associate Professor\, IIT Mad
 ras\, India
DTSTART:20240308T130000Z
DTEND:20240308T143000Z
UID:TALK213142@talks.cam.ac.uk
CONTACT:Ramachandra Kannan
DESCRIPTION:Modern high bypass ratio turbofan engines employ high-lift low
 -pressure turbines (LPTs)\, that power the fan. Due to the necessity of re
 ducing the weight and maintenance cost of LPT\, this component has receive
 d considerable research attention over the years. The ultra-high-lift (UHL
 ) blade designs employed by modern engines are at an increased risk of per
 formance deterioration resulting from the tendency of flow to separate fro
 m the suction surface under strong local adverse pressure gradients (APGs)
 . Free-stream turbulence\, incoming wakes\, and surface roughness contribu
 te positively towards reducing the separation bubble-related losses in the
  transitional regime. However\, the ensuing boundary layer losses due to b
 ypass transition increases the profile loss in the turbulent regime.\n\nSt
 arting with a brief overview of the ongoing research activities in our gro
 up at IIT Madras\, this talk delves into the possibilities of employing no
 vel “rough-ribbed” high-lift low-pressure turbine blades to reduce pro
 file loss. The efficacy of this strategy will also be demonstrated under o
 ff-design conditions and varying pressure gradients. Since the flow is pre
 dominantly transitional over the blade\, the talk also sheds light on the 
 "real roughness scales" that matter the most while running the high-fideli
 ty scale resolving simulations.
LOCATION: LT6\, First floor Baker building\, Dept of engineering\, Cambrid
 ge university\, Trumpington street\, CB2 1PZ
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