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Keywords: roughness
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Proceedings Papers

Proc. ASME. GT2023, Volume 13D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Radial Turbomachinery Aerodynamics; Unsteady Flows in Turbomachinery, V13DT35A007, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101917
... Abstract This paper presents numerical and experimental investigations of the flow in a rotating microchannel whose walls’ roughness covers a substantial part of the channel height. The roughness can intensify the momentum and heat transfer but also increase the drag force. An intentionally...
Proceedings Papers

Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A027, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103119
... Abstract The present experimental study was intended to investigate the impact of casing roughness on the tip leakage flow and the loss in a linear turbine cascade. Detailed flow measurements utilizing a five-hole probe, namely the so-called Oxford probe, and a miniaturized Pitot probe were...
Proceedings Papers

Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A030, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103355
... Abstract High-fidelity simulation of transitional and turbulent flows over multi-scale surface roughness presents several challenges. For instance, the complex and irregular geometrical nature of surface roughness makes it impractical to employ conforming structured grids, commonly adopted...
Proceedings Papers

Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A020, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102671
... Abstract Turbine blades generally present surface roughness introduced in the manufacturing process or caused by in-service degradation, which can have a significant impact on aero-thermal performance. A better understanding of the fundamental physical mechanisms arising from the interaction...
Proceedings Papers

Proc. ASME. GT2022, Volume 6B: Heat Transfer — General Interest/Additive Manufacturing Impacts on Heat Transfer; Internal Air Systems; Internal Cooling, V06BT13A012, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-82391
... and that offer reduced weight and better thermal performance. This is of particular relevance for gas turbine cooling as well, as proved by the first applications of combustors and turbine blades made entirely by AM. Despite that, the effects of the increased surface roughness on friction and heat transfer...
Proceedings Papers

Proc. ASME. GT2022, Volume 6B: Heat Transfer — General Interest/Additive Manufacturing Impacts on Heat Transfer; Internal Air Systems; Internal Cooling, V06BT13A018, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-82914
... Abstract Additive Manufacturing (AM) in turbine technology enables the manufacture of complex and detailed shapes such as optimized cooling channel designs. However, the AM components are usually produced with high surface roughness. The ability to predict the pressure loss and heat transfer...
Proceedings Papers

Proc. ASME. GT2021, Volume 5B: Heat Transfer — General Interest; Internal Air Systems; Internal Cooling, V05BT13A010, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-59603
... Abstract It is well-known from the literature that surface roughness significantly affects friction and heat transfer. This is even more evident for additive manufactured (AM) components, which are taking an increasingly important role in the gas turbine field. However, the exploitation...
Proceedings Papers

Proc. ASME. GT2021, Volume 5B: Heat Transfer — General Interest; Internal Air Systems; Internal Cooling, V05BT14A008, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-59163
... Proceedings of ASME Turbo Expo 2021 Turbomachinery Technical Conference and Exposition GT2021 June 7-11, 2021, Virtual, Online GT2021-59163 EXPERIMENTAL INVESTIGATIONS INTO THE EFFECT OF SURFACE ROUGHNESS AND CONTACT FORCE ON LEAKAGE BETWEEN TWO RIGID METALLIC SURFACES Cyrille Bricaud Vincent...
Proceedings Papers

Proc. ASME. GT2020, Volume 7C: Heat Transfer, V07CT13A021, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-15406
... Abstract It is well-known from the literature that surface roughness affects significantly friction and heat transfer. This is even more evident for additive manufactured (AM) components, which are taking an increasingly important role in the gas turbine field. However, the exploitation...
Proceedings Papers

Proc. ASME. GT2012, Volume 7: Structures and Dynamics, Parts A and B, 131-141, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-68502
... The 7050 aluminum alloy is used in many aerospace structural applications. Previous studies have identified that fatigue cracks develop very rough crack-surface profiles, which cause very high crack-closure levels due to a combination of plasticity, roughness and debris. Previously, tests were...
Proceedings Papers

Proc. ASME. GT2009, Volume 3: Heat Transfer, Parts A and B, 539-548, June 8–12, 2009
Publisher: American Society of Mechanical Engineers
Paper No: GT2009-59567
... camera was used to obtain the film cooling effectiveness from steady state tests and surface convective heat transfer coefficients using transient tests. The model with upstream deposition caused the primary flow to lift off the surface over the roughness peaks and allowed the coolant to stay attached...
Proceedings Papers

Proc. ASME. GT2002, Volume 3: Turbo Expo 2002, Parts A and B, 349-363, June 3–6, 2002
Publisher: American Society of Mechanical Engineers
Paper No: GT2002-30198
... 05 02 2009 Experimental measurements of skin friction (c f ) and heat transfer (St) augmentation are reported for low speed flow over turbine roughness models. The models were scaled from surface measurements taken on actual, in-service land-based turbine hardware. Model scaling...
Proceedings Papers

Proc. ASME. GT2004, Volume 2: Turbo Expo 2004, 329-337, June 14–17, 2004
Publisher: American Society of Mechanical Engineers
Paper No: GT2004-54328
... materials at various impact conditions. Surface roughness measurements obtained prior and subsequent to the erosion tests are used to characterize the change in roughness caused by erosion. Numerical simulations for the three dimensional flow field and particle trajectories through a low pressure gas...
Proceedings Papers

Proc. ASME. GT2005, Volume 3: Turbo Expo 2005, Parts A and B, 879-887, June 6–9, 2005
Publisher: American Society of Mechanical Engineers
Paper No: GT2005-69045
... 19 11 2008 After an extended period of operation, the surfaces of turbine airfoils become extremely rough due to deposition, spallation, and erosion. The rough airfoil surfaces will cause film cooling performance degradation due to effects on adiabatic effectiveness and heat transfer...
Proceedings Papers

Proc. ASME. GT2005, Volume 4: Turbo Expo 2005, 327-337, June 6–9, 2005
Publisher: American Society of Mechanical Engineers
Paper No: GT2005-68701
... of the salt deposits are presented, providing insight into the increased surface roughness and the deposit thickness and distribution. The test data show good agreement with published stage characteristics and give valuable information regarding stage-by-stage performance deterioration. Axial compressor...
Proceedings Papers

Proc. ASME. GT2006, Volume 5: Marine; Microturbines and Small Turbomachinery; Oil and Gas Applications; Structures and Dynamics, Parts A and B, 491-501, May 8–11, 2006
Publisher: American Society of Mechanical Engineers
Paper No: GT2006-90004
... the increased surface roughness and the distribution of salt deposits in an axial compressor. The test data showed good agreement with published data for stage performance deterioration. This paper compares the GE J85-13 test data on surface roughness to previously published work on surface roughness...
Proceedings Papers

Proc. ASME. GT2006, Volume 3: Heat Transfer, Parts A and B, 1055-1063, May 8–11, 2006
Publisher: American Society of Mechanical Engineers
Paper No: GT2006-91246
...Submitted for GT2006 Copyright © 2006 by ASME 1 four measurements evenly spaced through the lifecycle of a turbine blade surface. From these measurements the surface topology and roughness statistics were determined. Despite the different surface treatments, all three surfaces exhibited similar non...
Proceedings Papers

Proc. ASME. GT2006, Volume 3: Heat Transfer, Parts A and B, 1075-1082, May 8–11, 2006
Publisher: American Society of Mechanical Engineers
Paper No: GT2006-91257
... with deposition but then levels off as the surface becomes less peaked. Subsequent deposition exposure then produces a second increase in St. Surface maps of St highlight the local influence of deposit peaks with regard to heat transfer. [Keywords: deposition, roughness, turbines] NOMENCLATURE I = total number...