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Investigation of a new high-speed zero-emission transportation “Aerotrain” is proceeded mainly in Tohoku University and University of Miyazaki. Since the Aerotrain utilizes the ground effect, researches of the aerofoil section which can efficiently harness the ground effect are important. The Aerotrain moves along U-shaped guide way which has a ground and two side walls, so a many viscous interference occur between the Aerotrain and the walls. The flow through primary and secondary aerofoils is analyzed to prevent the boundary layer separation for the improvement of the aerodynamic characteristics at low speed near the ground. A small secondary aerofoil is equipped above the trailing edge of the primary aerofoil to increase lift at takeoff and landing. The most suitable location of secondary aerofoil is investigated through the boundary layer approximation analysis and the experiment using a towing wind tunnel. We verify the effect of secondary aerofoil by experiment, confirm the accuracy of the analysis by comparing with experimental results, and try to find the most suitable aerofoil section for the Aerotrain.

An Analysis of Ground Effects on Aerodynamic Characteristics of Aerofoils with a Secondary Aerofoil