发明名称 |
Combined riblet and lebu drag reduction system |
摘要 |
The invention is a system of flow control devices which result in reduced skin friction on aerodynamic and hydrodynamic surfaces. The devices cause a breakup of large-scale disturbances in the boundary layer of the flow field. Referring to FIGS. 1 and 2, the riblet device 10 acts to reduce disturbances near the boundary layer wall by the use of longitudinal striations forming vee-shaped grooves. These grooves are dimensional on the order of the wall vortices and turbulent burst dimensions 31 depicted in FIG. 3. The large-eddy breakup device 41, depicted in FIGS. 4 and 5, is a small strip or airfoil which is suspended in the upper region of the boundary layer. Various physical mechanisms cause a disruption of the large-scale vortices. The combination of the devices of this invention result in a substantial reduction in skin friction drag.
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申请公布号 |
US4706910(A) |
申请公布日期 |
1987.11.17 |
申请号 |
US19840686959 |
申请日期 |
1984.12.27 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION |
发明人 |
WALSH, MICHAEL J.;ANDERS, JOHN B.;HEFNER, JERRY N. |
分类号 |
B64C21/10;(IPC1-7):B64C21/10 |
主分类号 |
B64C21/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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