TY  - EJOU
AU  - Geng, Zihai 
AU  - Cai, Jinsheng 
AU  - Jiang, Yubiao 
AU  - Zhang, Weiguo 

TI  - On Aircraft Lift and Drag Reduction Using V Shaped Riblets
T2  - Fluid Dynamics \& Materials Processing

PY  - 2021
VL  - 17
IS  - 5
SN  - 1555-2578

AB  - Reducing drag during take-off and nominal (cruise) conditions is a problem of fundamental importance in aeronautical engineering. Existing studies have demonstrated that v-shaped symmetrical riblets can effectively be used for turbulence control, with those with dimensionless depth <i>h</i><sup>+</sup> = 15 and dimensionless width <i>s</i><sup><i>+</i></sup> = 15 having the best drag reduction effect. In the present study, experimental tests have been conducted considering two models of the same size, one with smooth surface, the other with v-shaped riblets of the <i>h</i><sup>+</sup> = 15 and <i>s</i><sup><i>+</i></sup> = 15 type. The results show that for an angle of attack in the 8°~20° range (take-off stage), the maximum lift coefficient can be increased by 22%. For angle of attack between 8° and 14°, a drag reduction effect can be produced using riblets, which increases with the Reynolds number, leading to a decrease in the drag coefficient maximum of 36%. Flow visualization experiments have been carried out by means of Laser Induced fluorescence.
KW  - Transport model; V-shaped riblet; lifting drag reduction; flow visualization

DO  - 10.32604/fdmp.2021.012108