Computation of Compressible Flow and Heat Transfer in a Rotating Duct With Inclined Ribs and a 180-Degree Bend

Stephens, Mark; Shih, Tsan‐Hsing

doi:10.1115/97-gt-192

Cited by 20 publications

(9 citation statements)

References 16 publications

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“…In the following, only a few representative studies using the low Reynolds number k-ω model and second moment closure model are mentioned. Stephens et al (1997) performed an investigation of the effect of 45 • angled ribs on the heat transfer coefficients in a rotating two-pass square channel using a low-Re number k-ω turbulence model. They studied the effects of compressible flow Reynolds numbers, rotation numbers, and buoyancy parameters.…”

Section: Computational Heat Transfer In Rotating Coolant Passagesmentioning

confidence: 99%

Recent Studies in Turbine Blade Cooling?

Han¹

2004

The International Journal of Rotating Machinery

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Gas turbines are used extensively for aircraft propulsion, land-based power generation, and industrial applications. Developments in turbine cooling technology play a critical role in increasing the thermal efficiency and power output of advanced gas turbines. Gas turbine blades are cooled internally by passing the coolant through several rib-enhanced serpentine passages to remove heat conducted from the outside surface. External cooling of turbine blades by film cooling is achieved by injecting relatively cooler air from the internal coolant passages out of the blade surface in order to form a protective layer between the blade surface and hot gas-path flow. For internal cooling, this presentation focuses on the effect of rotation on rotor blade coolant passage heat transfer with rib turbulators and impinging jets. The computational flow and heat transfer results are also presented and compared to experimental data using the RANS method with various turbulence models such as k-ε, and second-moment closure models. This presentation includes unsteady high free-stream turbulence effects on film cooling performance with a discussion of detailed heat transfer coefficient and film-cooling effectiveness distributions for standard and shaped film-hole geometry using the newly developed transient liquid crystal image method.

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Section: Computational Heat Transfer In Rotating Coolant Passagesmentioning

confidence: 99%

Recent Studies in Turbine Blade Cooling?

Han¹

2004

The International Journal of Rotating Machinery

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“…Some examples of experimental work include Boyle (1984), Chen et al (1996), Hibbs et al (1997), Rau et al (1996), Shen et al (1994), and Taslim et al (1995). Some examples of numerical work is this area includes Stephens et al (1995aStephens et al ( , 1995b, Stephens et al (1996), and Stephens and Shih (1997).…”

Section: Introductionmentioning

confidence: 99%

Prediction of Heat and Mass Transfer in a Rotating Ribbed Coolant Passage With a 180 Degree Turn

Rigby¹

1998

Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration

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Numerical results are presented for flow in a rotating internal passage with a 180 degree turn and ribbed walls. Reynolds numbers ranging from 5200 to 7900, and Rotation numbers of 0.0 and 0.24 were considered. The straight sections of the channel have a square cross section, with square ribs spaced one hydraulic diameter (D) apart on two opposite sides. The ribs have a height of 0.1D and are not staggered from one side to the other. The full three dimensional Reynolds Averaged Navier-Stokes equations are solved combined with the Wilcox k-ω turbulence model. By solving an additional equation for mass transfer, it is possible to isolate the effect of buoyancy in the presence of rotation. That is, heat transfer induced buoyancy effects can be eliminated as in naphthalene sublimation experiments. Heat transfer, mass transfer and flow field results are presented with favorable agreement with available experimental data. It is shown that numerically predicting the reattachment between ribs is essential to achieving an accurate prediction of heat/mass transfer. For the low Reynolds numbers considered, the standard turbulence model did not produce reattachment between ribs. By modifying the wall boundary condition on ω, the turbulent specific dissipation rate, much better agreement with the flow structure and heat/mass transfer was achieved. It is beyond the scope of the present work to make a general recommendation on the ω wall boundary condition. However, the present results suggest that the ω boundary condition should take into account the proximity to abrupt changes in geometry.

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“…Stephens et al [32,33] studied inclined ribs in a straight non-rotating square duct. Stephens and Shih [34] investigated the effect of angled ribs on the heat transfer coefficients in a rotating two-passage duct using a low-Re number k-ω turbulence model. They studied the effects of Reynolds numbers, rotation numbers, and buoyancy parameters.…”

Section: Ribbed Surfacesmentioning

confidence: 99%

Computation of Flow and Heat Transfer in Turbine Blade Cooling Passages by Reynolds Stress Turbulence Model (Keynote Paper)

Chen

Han

2002

Volume 2: Symposia and General Papers, Parts a and B

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Numerical predictions of three-dimensional flow and heat transfer are presented for non-rotating and rotating turbine blade cooling passages with or without the rib turbulators. A multi-block Reynolds-averaged Navier-Stokes method was employed in conjunction with a near-wall second-moment closure to provide detailed velocity, pressure, and temperature distributions as well as Reynolds stresses and turbulent heat fluxes in various cooling channel configurations. These numerical results were systematically evaluated to determine the effect of blade rotation, coolant-to-wall density ratio, rib shape, channel aspect ratio and channel orientation on the generation of flow turbulence and the enhancement of surface heat transfer in turbine blade cooling passages. The second-moment solutions show that the secondary flow induced by the angled ribs, centrifugal buoyancy, and Coriolis forces produced strong nonisotropic turbulent stresses and heat fluxes that significantly affected flow field and surface heat transfer coefficients.

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Computation of Compressible Flow and Heat Transfer in a Rotating Duct With Inclined Ribs and a 180-Degree Bend

Cited by 20 publications

References 16 publications

Recent Studies in Turbine Blade Cooling?

Recent Studies in Turbine Blade Cooling?

Prediction of Heat and Mass Transfer in a Rotating Ribbed Coolant Passage With a 180 Degree Turn

Computation of Flow and Heat Transfer in Turbine Blade Cooling Passages by Reynolds Stress Turbulence Model (Keynote Paper)

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