Multi-row Film Cooling Boundary Layers PDF Download
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Author: Greg Natsui Publisher: ISBN: Category : Languages : en Pages : 320
Book Description
High fidelity measurements are necessary to validate existing and future turbulence models for the purpose of producing the next generation of more efficient gas turbines. The objective of the present study is to conduct several different measurements of multi-row film cooling arrays in order to better understand the physics involved with injection of coolant through multiple rows of discrete holes into a flat plate turbulent boundary layer. Adiabatic effectiveness distributions are measured for several multi-row film cooling geometries. The geometries are designed with two different hole spacings and two different hole types to yield four total geometries. One of the four geometries tested for adiabatic effectiveness was selected for flowfield measurements. The wall and flowfield are studied with several testing techniques. Pressure sensitive paint and discrete gas sampling taps are simultaneously used to measure adiabatic film cooling effectiveness by taking advantage of the heat and mass transfer analogy. All cooling regimes documented by Goldstein (1) for a single row are seen in the multi-row geometries studied. As the blowing ratio increases from 0, the laterally averaged effectiveness increases everywhere, until a point is reached at which upstream rows begin to drop in performance while the downstream rows increase in performance. Finally, a point is reached at which the cooling performance drops everywhere as the blowing ratio is increased.
Author: Greg Natsui Publisher: ISBN: Category : Languages : en Pages : 320
Book Description
High fidelity measurements are necessary to validate existing and future turbulence models for the purpose of producing the next generation of more efficient gas turbines. The objective of the present study is to conduct several different measurements of multi-row film cooling arrays in order to better understand the physics involved with injection of coolant through multiple rows of discrete holes into a flat plate turbulent boundary layer. Adiabatic effectiveness distributions are measured for several multi-row film cooling geometries. The geometries are designed with two different hole spacings and two different hole types to yield four total geometries. One of the four geometries tested for adiabatic effectiveness was selected for flowfield measurements. The wall and flowfield are studied with several testing techniques. Pressure sensitive paint and discrete gas sampling taps are simultaneously used to measure adiabatic film cooling effectiveness by taking advantage of the heat and mass transfer analogy. All cooling regimes documented by Goldstein (1) for a single row are seen in the multi-row geometries studied. As the blowing ratio increases from 0, the laterally averaged effectiveness increases everywhere, until a point is reached at which upstream rows begin to drop in performance while the downstream rows increase in performance. Finally, a point is reached at which the cooling performance drops everywhere as the blowing ratio is increased.
Author: Craig Patrick Fernandes Publisher: ISBN: Category : Languages : en Pages : 146
Book Description
The results show good agreement with effectiveness measurements of a previous study at a higher density ratio. However, to accurately draw the comparison, effectiveness measurements should be conducted at a density ratio of 1. Recommendations were made to further the study of multi-row film cooled boundary layers. The scope includes a CFD component, other flowfield measurement techniques, and surface effectiveness studies using N2 as the coolant for a much broader picture of this flowfield.
Author: Greg Natsui
Author: Greg Natsui
Author: Craig Patrick Fernandes
Author: Christopher A. Lemmon
Author: Christian Liess
Author: Louis M. Russell
Author: Michael E. Crawford
Author: Kokichi Furuhama
Author: D. W. Luckey
Author: S. S. Kutateladze
Author: Willis H. Braun