蛛丝
发表于 2025-3-26 22:10:17
Performances of internal manipulators in subsonic three-dimensional flowshord Reynolds numbers have been considered: 2.65 10. and 4.25 10.. On both sides of the aerofoil, grooves have been aligned with the free-stream flow direction. Skin-friction drag decreases of up to 5–6% have been recorded when the dimensionless rib height, scaled with wall units, is less than 15–20.
hereditary
发表于 2025-3-27 02:52:07
Turbulent drag reduction of a d-type rough wall boundary layer with longitudinal thin ribs placed wiin terms of the rib Reynolds number. Comparisons of some mean flow properties between the d—type rough wall flow with and without the longitudinal ribs provide evidence that the present passive control device also reduces the turbulent energy production rate.
Afflict
发表于 2025-3-27 05:34:54
Experiments with a 1:4.2 model of a commuter aircraft with riblets in a large wind tunnel Tunnel (DNW). 82% of the aircraft model including large parts of the wings and the nacelles were covered with the riblet film. The leading edge of the wing, however, was covered with smooth plastic film. Data with and without a tripping strip on wings, fuselage and nacelles were collected..With a t
Panther
发表于 2025-3-27 12:27:09
Heat transfer study of ribletsnt boundary layer and the results compared with those of a smooth surface. The heat-transfer coefficient has been measured for the Reynolds number of 2.8 to 11.3×10. based on the streamwise length, covering a range of dimensionless riblet height and spacing of 6 to 60 wall units. The experimental re
遍及
发表于 2025-3-27 16:02:20
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季雨
发表于 2025-3-27 20:52:30
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Metamorphosis
发表于 2025-3-27 22:18:34
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惹人反感
发表于 2025-3-28 05:58:08
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Mingle
发表于 2025-3-28 07:34:08
Analytical and experimental study of energy density spectra of the outer region of a manipulated turbulent flow convected by its mean velocity and uses the unsteady aerodynamic theory to calculate the modified velocity field downstream of the device. An expression for the modified one-dimensional energy density spectrum .. is derived in terms of the unmanipulated layer spectra ... An experimental
索赔
发表于 2025-3-28 12:14:26
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