NDLI: Effect of turbulence intensities and passive flow control on LP turbine

Content Provider	IEEE Xplore Digital Library
Author	Chishty, M.A. Hamdani, H.R. Parvez, K.
Copyright Year	2013
Description	Author affiliation: NUST, Islamabad, Pakistan (Chishty, M.A.; Hamdani, H.R.; Parvez, K.)
Abstract	Flow controlling of boundary layers separation of low-pressure (LP) turbine blade is still a high leverage area for advent of high lift and ultra-high lift LP turbines. At cruising conditions, the Reynolds number in the LP turbine reduces (due to the decrease in air density) to the critical value that flow starts to separate from the blade suction surface. In the present study, cascade T106A is used to control the laminar separation bubble on the suction side of the blade. Fluent® commercial CFD code with gamma theta transition model has been employed to study the boundary layer separation at various different turbulent intensities. Numerical results are validated with the available experimental data and are in good agreement. An optimize dimple is used to control the boundary layer separation at low and intermediate turbulent intensities. Normalized loss coefficient is reduced to about 5% with the help of optimal dimple size and location, which increase the LP turbine efficiency. $C_{p}$ plots and boundary layers profiles are made for flow visualization.
Starting Page	230
Ending Page	235
File Size	1814351
Page Count	6
File Format	PDF
ISBN	9781467344258
e-ISBN	9781467344265
DOI	10.1109/IBCAST.2013.6512159
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-15
Publisher Place	Pakistan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Computational fluid dynamics Computational modeling Blades Dimple Suction surface Predictive models Indexes Turbulent intensities Gamma theta transition model Geometry Boundary layer separation Low pressure turbine Separation bubble Turbulent length scale
Content Type	Text
Resource Type	Article

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