The main stages in aerodynamic design method and process of aircraft include: ____.
A. The investigation and demonstration
B. The concept and preliminary design
C. The wind tunnel test and verification
D. The flight tests
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The main methods of laminar flow control include: ____.
A. Changing the wing’s configuration
Breath air at the wing’s leading edge
C. Breath air at the wing’s lower surface
D. Breath air at the wing’s upper surface
Main methods of suppress the airflow separation are: ____.
A. Using vortex generator.
B. Using air blowing control at separation position
C. Launch a high-speed jet at the leading edge of the wing.
D. Control the angle of attack of the wing.
The influences of wingtip trailing vortex are: ____.
A. The efficiency of the airport
B. The efficiency of aircraft’s take-off and landing
C. The lift of the plane
D. Increase the induced drag
The main noise sources on the airframe includes: ____.
Aerodynamic noises of high lift device
B. Aerodynamic noises of landing gear
C. Interference noises among the aircraft
D. Jet noise of engine
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