Experimental Study of Boundary Layer Transition with Elevated Freestream Turbulence on a Heated Flat Plate
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Experimental Study of Boundary Layer Transition with Elevated Freestream Turbulence on a Heated Flat Plate

Experimental Study of Boundary Layer Transition with Elevated Freestream Turbulence on a Heated Flat Plate


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About the Book

A detailed investigation to document momentum and thermal development of boundary layers undergoing natural transition on a heated flat plate was performed. Experimental results of both overall and conditionally sampled characteristics of laminar, transitional, and low Reynolds number turbulent boundary layers are presented. Measurements were acquired in a low-speed, closed-loop wind tunnel with a freestream velocity of 100 ft/s and zero pressure gradient over a range of freestream turbulence intensities (TI) from 0.4 to 6 percent. The distributions of skin friction, heat transfer rate and Reynolds shear stress were all consistent with previously published data. Reynolds analogy factors for R(sub theta) is less than 2300 were found to be well predicted by laminar and turbulent correlations which accounted for an unheated starting length. The measured laminar value of Reynolds analogy factor was as much as 53 percent higher than the Pr(sup -2/3). A small dependence of turbulent results on TI was observed. Conditional sampling performed in the transitional boundary layer indicated the existence of a near-wall drop in intermittency, pronounced at certain low intermittencies, which is consistent with the cross-sectional shape of turbulent spots observed by others. Non-turbulent intervals were observed to possess large magnitudes of near-wall unsteadiness and turbulent intervals had peak values as much as 50 percent higher than were measured at fully turbulent stations. Non-turbulent and turbulent profiles in transitional boundary layers cannot be simply treated as Blasius and fully turbulent profiles, respectively. The boundary layer spectra indicate predicted selective amplification of T-S waves for TI is approximately 0.4 percent. However, for TI is approximately 0.8 and 1.1 percent, T-S waves are localized very near the wall and do not play a dominant role in transition process. Sohn, Ki-Hyeon and Reshotko, Eli Unspecified Center NASA-CR-187068, NAS 1.26:187068 NAG3-...


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Product Details
  • ISBN-13: 9781723575563
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 270
  • Spine Width: 14 mm
  • Width: 216 mm
  • ISBN-10: 1723575569
  • Publisher Date: 24 Jul 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 630 gr


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Experimental Study of Boundary Layer Transition with Elevated Freestream Turbulence on a Heated Flat Plate
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