A Power-Augmented Ram Wing in Ground (PARWIG) is a wing in ground effect, whose lift is enhanced by the airflow of a thruster placed in the upstream of the wing, to make a high ram pressure region under the wing. In the present paper, 3-dimensional PAR effects were numerically studied by solving the Navier-Stokes equations. Pressure distributions and velocity vectors were simulated around the pressure and suction sides of the wing surface. Through the numerical simulation, Cp values and lift/drag ratio are carefully reviewed by changing the height/choard; 0.05, 0.1, 0.3 and 0.8, and the angle of attack : 4,6,10 degrees. The shape of model is NACA 0012 and span/chord is 3.0. According to the numerical results, the relationship between lift/drag and height/chord is fairly reasonable.
The WIG (Wing In Ground effect) ship combines the features of both the airplane and ship, attracting the attention as the next generation of high speed craft, because it gives us the newest type of highly efficient vessel operating over 100 knots. A wing operating in close proximity to the ground exhibits a reduction in induced drag, which increases the lift/drag ratio. For several decades, this phenomenon has been studied because it complicates the takeoff and landing for the advancing wing near the ground (Lippisch, 1964, Lockeed,1962). During the 1970s, small experimental WIG vehicles were designed and tested in a coastal sea environment. However, it was noticed that the vehicles had a high structural weight fraction and an undesirably high takeoff-power/cruise-power ratio. In the mid and late 1970s, the PAR phenomena were discovered, which significantly enhanced the performance of the WIG concept (Smithey, 1977). At low speeds, a static pressure rise occurs under the wings which lifts the vehicle out of thewater.
