Experimental investigation of drag coefficients of gobi surfaces |
| |
| Authors: | Email author" target="_blank">Zhibao?DongEmail author Jianjun?Qu Xiaoping?Liu Weiming?Zhang Xunming?Wang |
| |
| Institution: | Laboratory of Blown Sand Physics and Desert Environments, Institute of Environment and Engineering in Cold and Arid Regions, Institute of Environment and Engineering in Cold and Arid Regions, Chinese Academy of Sciences, Lanzhou 730000, China |
| |
| Abstract: | The response of gobi surfaces to the near-surface air flow can be characterized quantitatively by drag coefficients. By using wind tunnel tests, an attempt is made to define the relationship between the drag coefficients of gobi surfaces and gravel size and coverage. It is concluded that the drag coefficients of gobi surfaces tend to be constants when gravel coverage is over 40%-50%. Consequently, we think that the gobi deflation planes expanding vastly in the arid Northwestern China are aerodynamically stable, at least not the supplying sources of current dust storms, and therefore the emphasis on dust storm control should be paid on the so-called "earth gobi" that has low gravel coverage. The prediction model for drag coefficients of gobi surfaces has been developed by regressing drag coefficients on gravel size and coverage, the predicted results are in reasonably good agreement with wind tunnel results (R 2 = 0.94). The change of drag coefficients with gravel friction Reynolds number implies that the development extent of drag effect increases with gravel size and coverage. |
| |
| Keywords: | drag coefficient gravel coverage drag effect |
| 本文献已被 万方数据 SpringerLink 等数据库收录！ |
|
