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Author: Peter Bradshaw
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 50
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Author: Peter Bradshaw
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 50
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Existing prediction formulas for the effect of freestream turbulence (PST) on skin friction and heat transfer, based on measurements in low-intensity grid turbulence, fail at high intensities typical of the upstream stages of gas turbines. However, the previous evidence for this came from tests with various unconventional turbulence generators. In the present work measurements were made on the downstream-moving surface of a conveyor belt. This increased the effective value of Tu, the ratio of r.m.s. free-stream intensity to the veiocity difference across the boundary layer. Thus conventional grids could be used to generate high Tu. Heat transfer was measured by a quasi-transient technique. A fixed heating lamp shone on the belt near its upstream end. and the streamwise decrease of surface temperature was measured using a chordwise strip of liquid crystals. Conductive heat transfer into the belt was calculable. so convective heat transfer into the airstream could be deduced. Skin-friction results collapse fairly well using Hancock & Bradshaw's combination of intensity and length scale but lie well above their low-Tu correlation. (AN).
Author: Donald M. Bott
Publisher:
ISBN:
Category :
Languages : en
Pages : 450
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Author: M. F. Blair
Publisher:
ISBN:
Category :
Languages : en
Pages : 193
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In an earlier funded investigation, experimental research was conducted to deterine the influence of free-stream turbulence on turbulent boundary layer heat transfer and mean profile development. The data obtained under this earlier contract indicated that both the skin friction and the heat transfer increased significantly with increased free-stream turbulence level. Under the present investigation, detailed boundary layer turbulence structural data and turbulent heat transfer data were obtained for experimental test conditions and profile locations selected from the earlier test matrix. Numerious measurements assured that the present test conditions (boundary layer development and free-stream turbulence distributions) duplicated those of the earlier contract. The purposes for making these present detailed boundary layer turbulence measurements were: to provide data to which current finite-difference boundary layer turbulence models could be compared, and to generate a data base for the development of new analytical models for bondary layer heat transfer prediction. With the completion of the experimental portion of this investigation, a theoretical effort was made to assess the capability of a finite difference boundary layer computer program, ABLE (Analysis of the Boundary Layer Equations) for predicting the effect of free-stream turbulence on momentum and thermal boundary layers.
Author: Ding Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 714
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Author:
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ISBN:
Category :
Languages : en
Pages : 38
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Stagnation point flow and heat transfer under free-stream turbulence was studied. A new code and an optimized scheme were developed for this study. The optimized scheme was found to significantly save the computational cost. In addition, methods for prescribing realistic inflow turbulence were developed. Simulations with organized inflow disturbances were conducted to study the effect of spanwise length scale and intensity on the enhancement of wall heat transfer and skin friction. Three regimes were identified depending on the spanwise length scale, 'damping', 'attached amplifying', and 'detached amplifying' regimes. In the attached amplifying regime the enhancement of skin friction and heat transfer increases with the intensity of the inflow disturbance, but saturates for larger spanwise length scales. In all cases studied the heat transfer enhancement was 4-5 times larger than the skin friction enhancement. Finally, direct numerical simulations (DNS) of stagnation point flow with moderate grid resolution were conducted to study turbulence statistics. Mean profiles of u velocity and temperature were compared with laminar profiles, and the statistics of turbulence kinetic energy were obtained. The simulations have not completed yet, and preliminary results are included in this report.
Author: Subramanian Ramachandran
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 188
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Author: Ting Wang
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 343
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Author: Michael Joseph Barrett
Publisher:
ISBN:
Category : Skin friction (Aerodynamics)
Languages : en
Pages : 418
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Author: Frederick F. Simon
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 20
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