An Experimental Study of the Wake Characteristics of a Turbine Blade Cascade PDF Download
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Author: Richard Jeff Cole
Publisher:
ISBN:
Category : Cascades (Fluid dynamics)
Languages : en
Pages : 275
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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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Book Description
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: Wesley Roland Cox
Publisher:
ISBN:
Category : Turbines
Languages : en
Pages : 214
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Author: E. Eckert
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 36
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Book Description
Turbine-blade-section tests were made in a low-speed two-dimensional cascade tunnel using a Mach-Zehnder interferometer. Pressure distributions and forces were calculated from density gradients given by the interference patterns. The central blade was heated to improve the definition of boundary layer separation. Reynolds number was varied from 11,800 to 54,000 and spacing ration from 0.687 to 1.141.
Author: Jungho Choi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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: Carlos Rene Gonzalez Rodriguez
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Kameswara Rao Pappu
Publisher:
ISBN:
Category :
Languages : en
Pages : 492
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Author: D. Laurence
Publisher: Elsevier
ISBN: 0080530982
Category : Science
Languages : en
Pages : 975
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Book Description
These proceedings contain the papers presented at the 4th International Symposium on Engineering Turbulence Modelling and Measurements held at Ajaccio, Corsica, France from 24-26 May 1999. It follows three previous conferences on the topic of engineering turbulence modelling and measurements. The purpose of this series of symposia is to provide a forum for presenting and discussing new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. Turbulence is still one of the key issues in tackling engineering flow problems. As powerful computers and accurate numerical methods are now available for solving the flow equations, and since engineering applications nearly always involve turbulence effects, the reliability of CFD analysis depends more and more on the performance of the turbulence models. Successful simulation of turbulence requires the understanding of the complex physical phenomena involved and suitable models for describing the turbulent momentum, heat and mass transfer. For the understanding of turbulence phenomena, experiments are indispensable, but they are equally important for providing data for the development and testing of turbulence models and hence for CFD software validation.
Author: J. R. Taylor
Publisher:
ISBN:
Category :
Languages : en
Pages : 11
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Author:
Publisher: Friedr Vieweg & Sohn Verlagsgesellschaft
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 268
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