School of Aeronautics;
Northwestern Polytechnical University;
Xi’an710072;
China;
Research&Development Institute of Northwestern Polytechnical University in Shenzhen;
Shenzhen518057;
China;
Yangtze River Delta Research Institute of Northwestern Polytechnical University;
Taicang215400;
China;
Slotted wingtip; Tip vortex; Drag reduction; Unsteady state; Flexibility;