Abstract
In this research, the aerodynamic performance and flow characteristics of NASA SC (2)-0714 airfoil and HH02 airfoil in the helicopter main rotor are evidently analyzed. The supercritical airfoil is used in the aircraft for attaining better transonic and high-speed flow characteristics. Moreover, a specialized helicopter airfoil called HH02 is used in the Apache helicopter rotor for increasing the operational speed. As most of the high-speed helicopters are using four-bladed main rotor configuration, it is analyzed with prior attention. The lift and thrust act in different directions for the forward phase of the flight whereas the lift and thrust act in the same direction for the other phases of flight, which is analyzed in this work. The computational analysis is done by using ANSYS Fluent whereas the rotational analysis is done by using the Multiple Reference Frame (MRF) method. An analysis is carried out for different RPM of 400,600 and 800 with the combination of 0.3, 0.4 and 0.5 Mach numbers with the assistance of grid independence test. The result shows that the NASA SC (2)-0714 rotor increases the thrust of the rotor around 5% to 10% under various rotor and forward speeds. Thus, the results proves that the supercritical airfoil is highly capable of producing higher thrust and good aerodynamic characteristics.
Highlights
The supercritical airfoil is used in the aircraft for attaining better transonic and high-speed flow characteristics
The analysis results of various forward and rotational speeds show that the NASA SC (2)-0714 rotor exhibit more thrust than the HH02 rotor
The pressure difference of NASA SC (2)-0714 rotor is higher than the HH02 rotor
Summary
The Helicopter has more advantages than the fixed-wing aircrafts. The flight phases of Helicopter are listed as vertical takeoff, hover, forward flight, sideward flight, and vertical descend. In contrast to the Helicopter, the Aircraft needs a special runway for its takeoff and landing. The lift is produced by the wings and the thrust is produced by the engine but in the Helicopter, both the lift and thrust are produced by a rotor, which is driven by the engine. The helicopter is highly applicable for various purposes like fire rescue or agriculture as it has the hovering phase. Hovering is a special phase, in which a helicopter stands in the same position and altitude for a long time to serve a special operation
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