Preliminary Study of Pressure Wave High Lift Aided Device and Basic Modeling of Its Efficiency

ABSTRACT

In recent disaster relief operations, short take-off and landing aircrafts began to excel. To enable the large fixed wing aircrafts to take off in a shorter distance, we designed a new high lift aided device. The design principle is different from conventional ones. According to formula of lift, lift is proportional to air density. Pressure wave high lift aided device is the lift-promoting system functioning by using pressure wave to increase the air density around wings. This article shows the mechanic design and the lift-promoting efficiency calculation. The calculation is based on a simplified model of Boeing 747-400. Since the take-off process is a variable acceleration motion, it is difficult to confirm the distance an aircraft need to reach take-off speed. We turned to study the extra take-off weight at the original take-off speed. We found that with the help of this device, the maximum take-off weight has increased 2.62%. And the take-off weight increment is proportional to the amplitude and frequency of the device. The author's conclusion is that although the increase is not much, the benefit is obvious. It could be more efficient if the amplitude and frequency are enhanced.

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