An Experimental Investigation of Two Large Annular Diffusers with Swirling and Distorted Inflow PDF Download
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Category :
Languages : en
Pages : 112
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Author:
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ISBN:
Category :
Languages : en
Pages : 112
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Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information Office
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ISBN:
Category : Diffusers
Languages : en
Pages : 103
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Two annular diffusers downstream of a nacelle-mounted fan were tested for aerodynamic performance, measured in terms of two static pressure recovery parameters (one near the diffuser exit plane and one about three diameters downstream in the settling duct) in the presence of several inflow conditions. The two diffusers each had an inlet diameter of 1.84 m, an area ratio of 2.3, and an equivalent cone angle of 11.5 deg, but were distinguished by centerbodies of different lengths. The dependence of diffuser performance on various combinations of swirling, radially distorted, and/or azimuthally distorted inflow was examined. Swirling flow and distortions in the axial velocity profile in the annulus upstream of the diffuser inlet were caused by the intrinsic flow patterns downstream of a fan in a duct and by artificial intensification of the distortions. Azimuthal distortions or defects were generated by the addition of four artificial devices (screens and fences). Pressure recover data indicated beneficial effects of both radial distortion (for a limited range of distortion levels) and inflow swirl. Small amounts of azimuthal distortion created by the artificial devices produced by only small effects on diffuser performance. A large artificial distortion device was required to produce enough azimuthal flow distortion to significantly degrade the static pressure recovery. (Author).
Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information Office
Publisher:
ISBN:
Category : Diffusers
Languages : en
Pages : 112
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 134
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 212
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 892
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 410
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 790
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Author: United States. Superintendent of Documents
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ISBN:
Category : Government publications
Languages : en
Pages : 1256
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1268
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