Nowadays computer and computer technology has completed ____ of the work in aircraft design and manufacture.
A. More than 50%
B. More than 60%
C. More than 70%
D. More than 80%
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CFD could be a substitution of wind tunnel tests under ____.
A. High angle of attack situation
B. Normal wind tunnel tests
C. Separate flow situation
D. Complex flowing control situation
The turbulent drag is ____ to the laminar drag.
A. 2 to 4 times
B. 3 to 5 times
C. 4 to 6 times
D. 5 to 7 times
Which of the following is wrong about the vortex generator? ____.
A. Its shape looks like a small triangular wing panel.
B. Can suppress the airflow separation and reduce the drag.
Can enhance the lift of the wing.
D. Placed on engine nacelles and can suppress the airflow separation of nacelle.
The vortex lift generated by the leading-edge vortex can reach ____ of the total lift.
A. More than 10%
B. More than 20%
C. More than 30%
D. More than 40%
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