An Analytical and Experimental Investigation of Turbulent Jet Impingement in a Confined Cross-flow PDF Download
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Author: G.D. Catalano
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: G.D. Catalano
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Keun Sun Chang
Publisher:
ISBN:
Category : Jets
Languages : en
Pages : 254
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Author: David Kenneth Mosher
Publisher:
ISBN:
Category : Jets
Languages : en
Pages : 340
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The interference phenomenon occurring when a subsonic turbulent jet exhausts normally from a large flat plate into a low speed crossflow was experimentally investigated in the Georgia Tech nine foot wind tunnel. Static pressures were measured on the surface around the jet. In the region off the surface, including the jet plume, wake and surrounding areas, the average total and static pressures and the average velocity magnitudes and directions were determined. Three jet exit configurations were studied, one circular and two slot-shaped with width to length ratios of 0.3 and 3.4. All have the same exit area. The effective jet to cross-flow velocity ratio was varied, for each of the exit configurations, over the range 4.0 to 12.0. Analysis of the data indicates that the pressure distributions induced on the surface are a combined result of the jet's blocking and entraining effects on the cross flow with entrainment becoming the more dominant of the two as the effective velocity ratio is increased. This relative dominance brings about an attenuation of total interference lift loss (when computed as a fraction of gross thrust) primarily by causing a rise in the low pressures in the wake region as the effective velocity ratio increases. When the effective velocity ratio is held fixed, the total interference lift loss increases with increasing width to length ratio of the jet exit. (Author).
Author: George D. Catalano
Publisher:
ISBN:
Category : Speed
Languages : en
Pages : 88
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Measurements and computations are reported for the flow of a turbulent jet discharging into a crossflow confined between two parallel plates. For jet-to-crossflow velocity ratios R equal to 2 and 4, mean and fluctuating velocity components are measured by a laser Doppler anemometer. High order statistics of the streamwise velocity and its time derivative have been measured in the plane of symmetry of a jet in a confined crossflow. The existence of universal similarity of the fine scale structure of a developing turbulent velocity field and the validity of original Kolmogorov local similarity theory and later formulations were investigated. Construction of normalized spectral for energy content, dissipation, and higher order moments enable an examination of the Reynolds number dissipation, and higher order moments enable an examination of the Reynolds number dependence of these functions for the Re sub lamda range from 16 to 800. Estimates of the Kolmogorov constant, mu, ranging from 0.27 to 0.43 were obtained with the arithmetic average equal to 0.38. The fractal dimension of the fine scale structure was estimated from the functional relationship between the flatness of the velocity time derivative and Re sub lambda. For unfiltered data, the fractal dimension was estimated to be 2.45. However, with a + or - 12 sigma bandwidth, the fractal dimension increased to 2. 73.
Author: J. M. Cimbala
Publisher:
ISBN:
Category : Cross-flow (Aerodynamics).
Languages : en
Pages : 108
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Author:
Publisher:
ISBN:
Category : Jets
Languages : en
Pages : 340
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Author: E. S. Levinsky
Publisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 102
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 468
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 492
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