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The Simulated Test Of The Wind Erosion & Wind Tunnel On Wind Contour Characteristics Close To Ground Surface At Typical Wind Erosive Region

Posted on:2007-07-13Degree:MasterType:Thesis
Country:ChinaCandidate:Y DuanFull Text:PDF
GTID:2133360185950519Subject:Agricultural mechanization project
Abstract/Summary:PDF Full Text Request
Correctly simulating the wind flow characteristics of the near ground surface of open-air in wind erosion tunnel is very necessary to the reliability of the wind erosion tunnel test results. The paper analyzed all sorts of analogue rig of atmospheric boundary layer and decided to use the different combination of spires, barriers and roughness elements to carry out simulation test. At the same time, this text also includes the design of the boundary layer analogue rig, such as spires, barriers and roughness elements. Based on Lab view, a wind tunnel data acquisition software was build, and together with Pitot tube, micro differential pressure pickup., the test system was established. In OFDY-1.2 type movable wind erosion tunnel, had the near ground boundary lay field of atmospheric boundary layer reappeared, and then debugged the wind velocity profile of open-air on six type ground surface (cropland without vegetation, bareness cropland, cropland with stubble, sandlot, cropland with vegetation, grassland) the test shows it is feasible to simulate wind velocity profile of atmospheric boundary layer with analogue rig such as spires & barriers, roughness elements in wind erosion tunnel. The test result offers a precondition for the indoor soil erosion experiment.
Keywords/Search Tags:Wind Tunnel, Atmospheric boundary layer, Spires & barriers, Roughness elements, Wind velocity profile
PDF Full Text Request
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