Blade Heat Transfer Measurements and Predictions in a Transonic Turbine Cascade

Giel, Paul W.; Fossen, G. James Van; Boyle, R. J.; Thurman, Douglas R.; Civinskas, K. C.

doi:10.1115/99-gt-125

Cited by 38 publications

(7 citation statements)

References 19 publications

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“…The vortices lift off the end-wall and approach the 25% span. Previous measurements showed that the vortices exit the turbine blade at 50% midspan Giel et al [15]. This result is obtained by experimental measurements and confirmed by the numerical calculations.…”

Section: Grid Independence Studysupporting

confidence: 74%

“…Giel et al [15] studied the effect of Reynolds number, exit Mach number, and inlet turbulence intensity on threedimensional heat transfer using experimental measurements. The results were compared to numerical calculations using three-dimensional Navier-Stokes code.…”

Section: Introductionmentioning

confidence: 99%

“…Pecnik et al [16] presented three-dimensional numerical investigations on a transonic turbine guide vane using different turbulence models on the predication of heat transfer and secondary flow effects. Garg and Ameri [11] performed numerical simulation using -model and a shear stress transport (SST) -model and compared their results with heat transfer measurements on a transonic turbine blade of Giel et al [15]. The results showed that the -model and SST -model compare well on pressure side of the blade and leading edge.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Secondary Flows on Heat Transfer of a Gas Turbine Blade

El-Batsh

Nada

Abdo

et al. 2013

International Journal of Rotating Machinery

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This study presents experimental and numerical investigation for three-dimensional heat transfer characteristics in a turbine blade. An experimental setup was installed with a turbine cascade of five-blade channels. Blade heat transfer measurements were performed for the middle channel under uniform heat flux boundary conditions. Heat was supplied to the blades using twentynine electric heating strips cemented vertically on the outer surface of the blades. Distributions of heat transfer coefficient were obtained at three levels through blade height by measuring surface temperature distribution using thermocouples. To understand heat transfer characteristics, surface static pressure distributions on blade surface were also measured. Numerical investigation was performed as well to extend the investigation to locations other than those measured experimentally. Three-dimensional nonisothermal, turbulent flow was obtained by solving Reynolds averaged Navier-Stokes equations and energy equation. The shear stress transport -model was employed to represent turbulent flow. It was found through this study that secondary flow generated by flow deflection increases heat transfer coefficient on the blade suction surface. Separation lines with high heat transfer coefficients were predicted numerically with good agreement with the experimental measurements.

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Section: Grid Independence Studysupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Secondary Flows on Heat Transfer of a Gas Turbine Blade

El-Batsh

Nada

Abdo

et al. 2013

International Journal of Rotating Machinery

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“…Chen and Goldstein acquired their data in a blade cascade at low Reynolds numbers (120,000-170,000). Blair [9] and Giel et al [10] also reported similar high levels of heat transfer in the near endwall region of the suction surface while again their research investigated turbine rotor passages. Conversely, Harasgama and Wedlake [11] investigated transient heat transfer in an annular vane cascade and found midspan heat transfer levels were consistently higher than values near the endwall.…”

Section: Introductionmentioning

confidence: 77%

Vane Suction Surface Heat Transfer in Regions of Secondary Flows: The Influence of Turbulence Level, Reynolds Number, and the Endwall Boundary Condition

Varty

Soma

Ames

et al. 2017

Journal of Turbomachinery

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Secondary flows in vane passages sweep off the endwall and onto the suction surface at a location typically close to the throat. These endwall/vane junction flows often have an immediate impact on heat transfer in this region and also move any film cooling off the affected region of the vane. The present paper documents the impact of secondary flows on suction surface heat transfer acquired over a range of turbulence levels (0.7–17.4%) and a range of exit chord Reynolds numbers (500,000–2,000,000). Heat transfer data are acquired with both an unheated endwall boundary condition and a heated endwall boundary condition. The vane design includes an aft loaded suction surface and a large leading edge diameter. The unheated endwall boundary condition produces initially very high heat transfer levels due to the thin thermal boundary layer starting at the edge of heating. This unheated starting length effect quickly falls off with the thermal boundary layer growth as the secondary flow sweeps up onto the vane suction surface. The heat transfer visualization for the heated endwall condition shows no initial high heat transfer level near the edge of heating on the vane. The heat transfer level in the region affected by the secondary flows is largely uniform, except for a notable depression in the affected region. This heat transfer depression is believed due to an upwash region generated above the separation line of the passage vortex, likely in conjunction with the counter rotating suction leg of the horseshoe vortex. The extent and definition of the secondary flow-affected region on the suction surface are clearly evident at lower Reynolds numbers and lower turbulence levels when the suction surface flow is largely laminar. The heat transfer in the plateau region has a magnitude similar to a turbulent boundary layer. However, the location and extent of this secondary flow-affected region are less perceptible at higher turbulence levels where transitional or turbulent flow is present. Also, aggressive mixing at higher turbulence levels serves to smooth out discernable differences in the heat transfer due to the secondary flows.

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“…Hybrid unstructured grid (leading edge region) Nondimensionalized pressure on the blade surface (experimental data provided by P Giel (1999)…”

mentioning

confidence: 99%

Simultaneous Prediction of External Flow-Field and Temperature in Internally Cooled 3-D Turbine Blade Material

Han

Dennis

Dulikravich

2000

Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration

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A two-dimensional (2-D) and a three-dimensional (3-D) conjugate heat transfer (convection-conduction) prediction codes were developed where the compressible turbulent flow Navier-Stokes equations are solved simultaneously in the flow-field and in the solid material of the structure thus automatically predicting correct magnitudes and distribution of surface temperatures and heat fluxes. The only thermal boundary conditions are the convection heat transfer coefficients specified on the surfaces of the internal coolant flow passages and the coolant bulk temperature of internally cooled gas turbine blade. This approach eliminates the need to specify hot surface temperature or heat flux distribution. The conjugate codes use hybrid unstructured triangular/quadrilateral grids in 2-D and unstructured prismatic grids in 3-D throughout the flow-field and in the surrounding structure. The codes are capable of conjugate heat transfer prediction in arbitrarily shaped internally cooled configurations. The computer codes have been successfully tested on internally cooled turbine airfoil cascades and 3-D turbine blades by the conjugate solution of the flow-field and the temperature field inside the structure.

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Blade Heat Transfer Measurements and Predictions in a Transonic Turbine Cascade

Cited by 38 publications

References 19 publications

Effect of Secondary Flows on Heat Transfer of a Gas Turbine Blade

Effect of Secondary Flows on Heat Transfer of a Gas Turbine Blade

Vane Suction Surface Heat Transfer in Regions of Secondary Flows: The Influence of Turbulence Level, Reynolds Number, and the Endwall Boundary Condition

Simultaneous Prediction of External Flow-Field and Temperature in Internally Cooled 3-D Turbine Blade Material

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