Effect of Density Ratio on Film Cooling Effectiveness for Injection Through a Row of Holes and for a Porous Slot PDF Download
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Author: Dean Russell Pedersen
Publisher:
ISBN:
Category : Gas flow
Languages : en
Pages : 744
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Author: Dean Russell Pedersen
Publisher:
ISBN:
Category : Gas flow
Languages : en
Pages : 744
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Book Description
Author: S. Stephen Papell
Publisher:
ISBN:
Category : Cooling
Languages : en
Pages : 32
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Author:
Publisher:
ISBN:
Category : Aerothermodynamics
Languages : en
Pages : 770
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Book Description
Author: A. K. Sinha
Publisher:
ISBN:
Category : Momentum (Mechanics)
Languages : en
Pages : 0
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Book Description
Film-cooling effectiveness was studied using a row of inclined holes that injected cryogenically cooled air across a flat, adiabatic test plate. The density ratio of the coolant to mainstream varied from 1.2 to 2.0. Surface temperatures were measured using a unique surface thermocouple arrangement free of conduction errors. Temperatures were obtained along the jet centerline and across a number of lateral locations. By independently varying density ratio and blowing rate, scaling of adiabatic effectiveness with mass flux ratio, velocity ratio, and momentum ratio was determined. Depending on the momentum flux ratio, the jet either remains attached to the surface, detaches and then reattaches, or is fully detached. For attached jets, the centerline effectiveness scaled with the mass flux ratio. However, for detached-reattached jets, a consistent scaling was not found although the general distribution of the centerline effectiveness scaled with momentum flux ratio. Laterally averaged effectiveness was found to be dependent on density ratio and momentum flux ratio. Decreases in density ratio and increases in momentum flux ratio were found to reduce the spreading of the film cooling jet significantly and thereby reduce laterally averaged effectiveness.
Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 484
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Book Description
Author: Gordon C. Oates
Publisher: AIAA
ISBN: 9781600860058
Category : Aerothermodynamics
Languages : en
Pages : 568
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Book Description
Annotation Design and R & D engineers and students will value the comprehensive, meticulous coverage in this volume. Beginning with the basic principles and concepts of aeropropulsion combustion, chapters explore specific processes, limitations, and analytical methods as they bear on component design.
Author: Mohammad Yousef Jabbari
Publisher:
ISBN:
Category : Cooling
Languages : en
Pages : 412
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Author: Andrew F. Chen
Publisher:
ISBN:
Category :
Languages : en
Pages :
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A systematic study was performed to investigate the combined effects of hole geometry, blowing ratio, density ratio and free-stream turbulence intensity on flat plate film cooling with forward and backward injection. Detailed film cooling effectiveness distributions were obtained using the steady state pressure sensitive paint (PSP) technique. Four common film-hole geometries with forward injection were used in this study: simple angled cylindrical holes and fan-shaped holes, and compound angled (ß= 45°) cylindrical holes and fan-shaped holes. Additional four film-hole geometries with backward injection were tested by reversing the injection direction from forward to backward to the mainstream. There are seven holes in a row on each plate and each hole is 4 mm in diameter. The blowing ratio effect is studied at 10 different blowing ratios ranging from M = 0.3 to M = 2.0. The coolant to main stream density ratio (DR) effect is studied by using foreign gases with DR = 1 (N2), 1.5 (CO2), and 2 (15% SF6 + 85% Ar). The free stream turbulence intensity effect is tested at 0.5% and 6%. The results of the parametric effects to the film cooling effectiveness with forward injection agreed with open literatures. In general, the results show the film cooling effectiveness with backward injection is greatly reduced for shaped holes as compared with the forward injection. However, significant improvements can be seen in simple angled cylindrical hole at higher blowing ratios. Backward injection also shows improvements at near film-hole regions for compound angled cylindrical holes at higher blowing ratios. Comparison was made between the experimental data and empirical correlation for simple angled fan-shaped holes. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/151849
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 812
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Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 536
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