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Keywords: roughness
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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
Paper No: GT2022-82391
... and turbine blades made entirely by AM. Despite that, the effects of the increased surface roughness on friction and heat transfer are not fully understood yet and this hinders the design process demanding further characterization by means of experimental tests. Also the exploitation of CFD simulations...
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
Paper No: GT2022-82914
... AM DMLS roughness sand grain height CFD friction factor Nusselt number pressure loss heat transfer Abstract Additive Manufacturing (AM) in turbine technology enables the manufacture of complex and detailed shapes such as optimized cooling channel designs. However, the AM...
Proceedings Papers

Proc. ASME. GT2021, Volume 5B: Heat Transfer — General Interest; Internal Air Systems; Internal Cooling, V05BT13A010, June 7–11, 2021
Paper No: GT2021-59603
... Proceedings of ASME Turbo Expo 2021 Turbomachinery Technical Conference and Exposition GT2021 June 7-11, 2021, Virtual, Online GT2021-59603 CALIBRATION OF A CFD METHODOLOGY FOR THE SIMULATION OF ROUGHNESS EFFECTS ON FRICTION AND HEAT TRANSFERIN ADDITIVE MANUFACTURED COMPONENTS Lorenzo Mazzei...
Proceedings Papers

Proc. ASME. GT2021, Volume 5B: Heat Transfer — General Interest; Internal Air Systems; Internal Cooling, V05BT14A008, June 7–11, 2021
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
Paper No: GT2020-15406
...CFD MODELLING STRATEGIES FOR THE SIMULATION OF ROUGHNESS EFFECTS ON FRICTION AND HEAT TRANSFER IN ADDITIVE MANUFACTURED COMPONENTS Lorenzo Mazzei, Riccardo Da Soghe, Cosimo Bianchini Ergon Research, via Campani, 50, 50127 Firenze FI Italy lorenzo.mazzei@ergonresearch.it ABSTRACT It is well-known...
Proceedings Papers

Proc. ASME. GT2012, Volume 7: Structures and Dynamics, Parts A and B, 131-141, June 11–15, 2012
Paper No: GT2012-68502
... Hartford, CT, USA 06118 balkrishna.annigeri@pw.utc.com ABSTRACT 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...
Proceedings Papers

Proc. ASME. GT2009, Volume 3: Heat Transfer, Parts A and B, 539-548, June 8–12, 2009
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
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
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 4: Turbo Expo 2005, 327-337, June 6–9, 2005
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. GT2005, Volume 3: Turbo Expo 2005, Parts A and B, 879-887, June 6–9, 2005
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. GT2006, Volume 3: Heat Transfer, Parts A and B, 1055-1063, May 8–11, 2006
Paper No: GT2006-91246
... maps of the deposit-roughened surfaces were created between each test, representing a total of 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...
Proceedings Papers

Proc. ASME. GT2006, Volume 3: Heat Transfer, Parts A and B, 1075-1082, May 8–11, 2006
Paper No: GT2006-91257
... 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. deposition roughness turbines Submitted for GT2006 ASME Turbo Expo 2006: Power...
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
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...