Cooling performance of film-cooling holes fed by channels of various shapes

Article Engineering, Mechanical

Printability and Overall Cooling Performance of Additively Manufactured Holes With Inlet and Exit Rounding

Emma M. M. Veley et al.

Summary: Various film cooling hole shapes for gas turbine hardware have been studied to improve cooling effectiveness. Additive manufacturing allows for unique design modifications, such as creating a rounded inlet to mitigate separation. This study explores geometric features of shaped film cooling holes at engine scale using additive manufacturing, evaluating both printability and cooling performance.

JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME (2023)

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Article Engineering, Mechanical

Heat Transfer and Pressure Loss of Additively Manufactured Internal Cooling Channels With Various Shapes

Alexander J. Wildgoose et al.

Summary: This experimental study investigates the pressure loss and heat transfer performance of various channel shapes produced using direct metal laser sintering. It is found that the diamond channel has the lowest Nusselt number and friction factor, while the pentagon has a similar Nusselt number to the circular channel despite having a lower friction factor. Parallel computational fluid dynamic simulations are used to understand the cooling performance relationships between different channel shapes.

JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME (2023)

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Article Thermodynamics

Conjugate Heat Transfer and Flow Features of Single-Hole and Combined-Hole Film Cooling With Rib-Roughened Internal Passages

Rui Zhu et al.

Summary: This study presents a computational analysis of cooling performance for a flat plate with both film cooling and internal cooling. The results show that the effectiveness of film cooling and internal cooling performance are influenced by the geometry of the delivery channels.

JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS (2022)

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Article Engineering, Mechanical

Adiabatic Effectiveness Measurements for a Baseline Shaped Film Cooling Hole

Robert P. Schroeder et al.

Summary: Film cooling on airfoils is crucial for gas turbine industry. The study aims to provide a baseline shaped cooling hole design for comparison. Adiabatic effectiveness was measured with the new design, showing peak performance at specific conditions.

JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME (2022)

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Article Mechanics

Prandtl's Secondary Flows of the Second Kind. Problems of Description, Prediction, and Simulation

N. Nikitin et al.

Summary: The study reveals that turbulent pulsations in noncircular cross-section straight pipes lead to the formation of secondary flows, which, although not intense, are significant for the transfer of momentum and heat.

FLUID DYNAMICS (2021)

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Article Engineering, Mechanical