Heat Transfer and Flow on the Squealer Tip of a Gas Turbine Blade

Azad, Gm. S.; Han, Je-Chin; Boyle, Robert

doi:10.1115/1.1311284

Cited by 136 publications

(41 citation statements)

References 17 publications

(1 reference statement)

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“…Cengiz Camci [10] conducts an experimental investigation of aerodynamic characteristics with full and partial-length squealer rims in turbine tip platform to study the passive control on tip leakage flow in a low-speed turbine stage. The tip leakage flow and the heat transfer around flat and squealer turbine tip geometry are studied in a linear turbine cascade [11]. In order to reduce the tip leakage loss using a tip platform extension edge by circumferentially extending the tip, the experiment was done in axial flow turbine stage with tip platform extension towards the pressure side or the suction side [12].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of tip clearance flow passive control in axial turbine

Wei

Qiao

et al. 2008

J. Therm. Sci.

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This paper focuses on the effects of five different passive turbine tip clearance flow control methods on the tip clearance flow physics, which consists of a partial suction side squealer tip, a double squealer tip, a pressure side tip shelf with inclined squealer tip on a double squealer tip, a tip platform extension edge in pressure side and in suction side respectively. A pressure-correction based, 3D Reynolds-averaged Navier-Stokes equations CFD code with Reynolds Stress Model was adopted. The variable specific heat was considered. The detailed tip clearance flow field with different squealer rims was described with the streamline and the velocity vector. Accordingly, the mechanisms of five passive controls were elucidated; the effects of the passive controls on turbine efficiency and tip clearance flow field were illuminated. The results showed that the secondary flow loss near the outer casing including the tip leakage losses and the passage vortex losses could be reduced in all the five passive control methods. The turbine efficiency could be increased via the rational passive turbine tip clearance flow control. The Improved PS Squealer had the best effect on turbine efficiency, and the efficiency increased by 0.215%.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of tip clearance flow passive control in axial turbine

Wei

Qiao

et al. 2008

J. Therm. Sci.

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“…Ameri et al (1998) conducted numerical simulations of the flow and heat transfer over a turbine blade with two squealer tips of 2% and 3% recesses, and found two vortical structures in the recess. Azad et al (2000b) reported detailed heat transfer coefficients on the cavity squealer tip surface with a 3.77% recess. They showed that the squealer tip blade has lower overall heat transfer coefficients than the plane tip blade.…”

Section: Introductionmentioning

confidence: 99%

Tip leakage aerodynamics over the cavity squealer tip equipped with full coverage winglets in a turbine cascade

Cheon

Lee

2015

International Journal of Heat and Fluid Flow

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“…They concluded that the high heat transfer coefficient appears in the leading edge region in the tip which is close to the pressure side and the heat transfer is greatly affected by the turbulence intensity and the tip clearance size. Azad et al [5,6] published experimental results of the GE-E3 first stage rotor blade tip with the flat and squealer structures at different boundary conditions. The effects of the turbulence intensity, the tip clearance size and tip geometry on heat transfer characteristics were all investigated in their experiments.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations on the steady and unsteady leakage flow and heat transfer characteristics of rotor blade squealer tip

Sun

Wang

et al. 2011

J. Therm. Sci.

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The steady and unsteady leakage flow and heat transfer characteristics of the rotor blade squealer tip were conducted by solving Reynolds-Averaged Navier-Stokes (RANS) equations with k-ω turbulence model. The first stage of GE-E3 engine with squealer tip in the rotor was adopted to perform this work. The tip clearance was set to be 1% of the rotor blade height and the groove depth was specified as 2% of the span. The results showed that there were two vortexes in the tip gap which determined the local heat transfer characteristics. In the steady flow field, the high heat transfer coefficient existed at several positions. In the unsteady case, the flow field in the squealer tip was mainly influenced by the upstream wake and the interaction of the blades potential fields. These unsteady effects induced the periodic variation of the leakage flow and the vortexes, which resulted in the fluctuation of the heat transfer coefficient. The largest fluctuation of the heat transfer coefficient on the surface of the groove bottom exceeded 16% of the averaged value on the surface of the squealer tip.

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Heat Transfer and Flow on the Squealer Tip of a Gas Turbine Blade

Abstract: 2o-a"o -c'nT - HEAT TRANSFER AND FLOW

Cited by 136 publications

References 17 publications

Numerical simulation of tip clearance flow passive control in axial turbine

Numerical simulation of tip clearance flow passive control in axial turbine

Tip leakage aerodynamics over the cavity squealer tip equipped with full coverage winglets in a turbine cascade

Numerical investigations on the steady and unsteady leakage flow and heat transfer characteristics of rotor blade squealer tip

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