![]() ![]() The transonic region is delayed by the supercritical airfoil in the helicopter blades. The speed of the aircraft or helicopter gets increased when the critical Mach number is increased. The supercritical airfoils has good characteristics in the transonic region and acceptable flow characteristics in the low-speed region. The supercritical airfoil is a specialized airfoil, which is used in the aircraft for delaying the onset of shock and for increasing the critical Mach number. 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. The helicopter is highly applicable for various purposes like fire rescue or agriculture as it has the hovering phase. The engine is connected to the rotor through the shaft. In aircraft, 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. In contrast to the Helicopter, the Aircraft needs a special runway for its takeoff and landing. The helicopter requires no special place for the take-off and landing because almost all the terrains are suitable for the helicopter. The flight phases of Helicopter are listed as vertical takeoff, hover, forward flight, sideward flight, and vertical descend. The Helicopter has more advantages than the fixed-wing aircrafts. Keywords: Helicopter rotor supercritical airfoil CFD MRF HH02 airfoil ![]() Thus, the results proves that the supercritical airfoil is highly capable of producing higher thrust and good aerodynamic characteristics. 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. 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 computational analysis is done by using ANSYS Fluent whereas the rotational analysis is done by using the Multiple Reference Frame (MRF) method. 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. As most of the high-speed helicopters are using four-bladed main rotor configuration, it is analyzed with prior attention. Moreover, a specialized helicopter airfoil called HH02 is used in the Apache helicopter rotor for increasing the operational speed. The supercritical airfoil is used in the aircraft for attaining better transonic and high-speed flow characteristics. Email: Received: 01 September 2021 Accepted: 09 November 2021Ībstract: 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. Dhanya Prakash 2ġVisvesvaraya Technological University, Belagavi, Karnataka, 590018, India 2ACS College of Engineering, Bengaluru, Karnataka, 560074, India *Corresponding Author: Inamul Hasan. Forward Flight Performance Analysis of Supercritical Airfoil in Helicopter Main Rotor Intelligent Automation & Soft Computing DOI:10.32604/iasc.2022.023252įorward Flight Performance Analysis of Supercritical Airfoil in Helicopter Main Rotor ![]()
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