An Experimental Study of Turbine Blade Wake Effects PDF Download
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Author: Wesley Roland Cox
Publisher:
ISBN:
Category : Turbines
Languages : en
Pages : 214
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Author: Wesley Roland Cox
Publisher:
ISBN:
Category : Turbines
Languages : en
Pages : 214
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Author: James Gregg Matson
Publisher:
ISBN:
Category : Gas-turbines
Languages : en
Pages : 106
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Author: James D. Heidmann
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Presented at the International Gas Turbine & Aeroengine Congress & Exhibition, Orlando, FL, Jun 2 - Jun 5, 1997.
Author:
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ISBN:
Category :
Languages : en
Pages :
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Author: Richard Jeff Cole
Publisher:
ISBN:
Category : Cascades (Fluid dynamics)
Languages : en
Pages : 275
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725097346
Category :
Languages : en
Pages : 28
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The effect of wake passing on the showerhead film cooling performance of a turbine blade has been investigated experimentally. The experiments were performed in an annular turbine cascade with an upstream rotating row of cylindrical rods. Nickel thin-film gauges were used to determine local film effectiveness and Nusselt number values for various injectants, blowing ratios, and Strouhal numbers. Results indicated a reduction in film effectiveness with increasing Strouhal number, as well as the expected increase in film effectiveness with blowing ratio. An equation was developed to correlate the span-average film effectiveness data. The primary effect of wake unsteadiness was found to be correlated by a streamwise-constant decrement of 0.094.St. Steady computations were found to be in excellent agreement with experimental Nusselt numbers, but to overpredict experimental film effectiveness values. This is likely due to the inability to match actual hole exit velocity profiles and the absence of a credible turbulence model for film cooling. Heidmann, James D. and Lucci, Barbara L. and Reshotko, Eli Glenn Research Center NASA-TM-107425, NAS 1.15:107425, E-10671 RTOP 505-62-10...
Author: Zhe Ning
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 69
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Wind turbine dynamics, wake effects and environmental impacts have been identified the most significant research topics needed for wind resource characterization and wind power generation. Among these issues, tip vortices generated from the blade tip have been recognized as a substantial resource for the turbulent wake flow as well as the aerodynamic noise emission from a wind turbine. An experimental study is conducted to characterize the evolution of the tip vortices downstream of a well-designed horizontal axis wind turbine (HAWT) model. In addition to measuring dynamic wind loads (both aerodynamic forces and moments) and power output from the wind turbine model, a Particle Image Velocimetry (PIV) system is used to make phase-locked flow field measurements to quantify the time-evolution of the tip vortices and turbulence flow structures in the wake of the wind turbine model. The objective of this study is to find an effective way to restrict the development of tip vortices and thus the consequential noise emission. By altering the blade tip design, unwanted tip vortices and vibration of the blade are suppressed considerably. The detailed flow field measurements are correlated with the wind load and power output measurements to elucidate the underlying physics associated with power generation and environmental impacts of wind turbines.
Author: Jungho Choi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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This experimental study contains two points; part 1 - turbine blade heat transfer under low Reynolds number flow conditions, and part 2 - trailing edge cooling and heat transfer. The effect of unsteady wake and free stream turbulence on heat transfer and pressure coefficients of a turbine blade was investigated in low Reynolds number flows. The experiments were performed on a five blade linear cascade in a low speed wind tunnel. A spoked wheel type wake generator and two different turbulence grids were employed to generate different levels of the Strouhal number and turbulence intensity, respectively. The cascade inlet Reynolds number based on blade chord length was varied from 15,700 to 105,000, and the Strouhal number was varied from 0 to 2.96 by changing the rotating wake passing frequency (rod speed) and cascade inlet velocity. A thin foil thermocouple instrumented blade was used to determine the surface heat transfer coefficient. A Liquid crystal technique based on hue value detection was used to measure the heat transfer coefficient on a trailing edge film cooling model and internal model of a gas turbine blade. It was also used to determine the film effectiveness on the trailing edge. For the internal model, Reynolds numbers based on the hydraulic diameter of the exit slot and exit velocity were 5,000, 10,000, 20,000, and 30,000 and corresponding coolant-to-mainstream velocity ratios were 0.3, 0.6, 1.2, and 1.8 for the external models, respectively. The experiments were performed at two different designs and each design has several different models such as staggered / inline exit, straight / tapered entrance, and smooth / rib entrance. The compressed air was used in coolant air. A circular turbulence grid was employed to upstream in the wind tunnel and square ribs were employed in the inlet chamber to generate turbulence intensity externally and internally, respectively.
Author: James D. Heidmann
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 272
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Author: D. J. Doorly
Publisher:
ISBN:
Category : Heat
Languages : en
Pages :
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