| Summary: | 碩士 === 國立屏東科技大學 === 機械工程系 === 94 === When vehicles travel close to the ground or to the surface of water, the resulting wing-in-ground effect will produce extra lift, which is characterized by fuel- savings, and high endurance. However, when the wing-in-ground craft takes off on the surface of water (or on the ground) the waves of water will generate a large amount of drag , but the wing-in-ground craft flies while taking off, and requires auxiliary equipment in order to increase the lift, so that it can take off within transient time.
This text studies the lift and drag, under the ground effect, for a specific three-dimensional NACA-4412 wing with the CFD, verify its accuracy and solve the problem of feasibility. Before then, there is a simulation of the wing using PAR(Power Augmentation of Ram), probing into and spraying the air current to the lift and drag, field flows and the situation is distributed under the ground effect. Also, there is a probe into different Mach numbers and spray impact on the wing by the air current at different angles. The best lift can be achieved with power complement and increasing the system, and when the fuselage contained angle α is 15 degrees before taking off, by the result (H=0.1c), it can take off rapidly within the most transient time. However, it has the best lift when being at 0 degrees that power complements and increases the system, and the fuselage contained angle α when the flight height reaches and cruises at flight height (H=0.5c).
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