Aeronautical and Space-Rocket Engineering
DOI: 10.34759/vst-2022-3-17-28
Аuthors
1*, 2**1. Central Aerohydrodynamic Institute named after N.E. Zhukovsky (TsAGI), 1, Zhukovsky str., Zhukovsky, Moscow Region, 140180, Russia
2. Moscow Institute of Physics and Technology (National Research University), 9, Institutskiy per., Dolgoprudny, Moscow region, 141701, Russia
*e-mail: olga.v.pavlenko@yandex.ru
**e-mail: reslan.mostafa97@gmail.com
Abstract
Airplanes powered by the Sun energy for the flight supporting and ensuring conventionally has a special structure and a wing of a wide span, while their aerodynamic surface are covered with photovoltaic cells. The wing of such flying vehicle consists of several sections to control its motion. Numerical study of the effect of interference of the airscrew and the solar battery powered airplane’s straight wing with extra-large aspect ratio on the hinge moments values of its deflected mechanization was performed. Computations were run at flow rates of V= 25 and 50 m/s and Reynolds numbers of Re = 0.17 and 0.35 106 by the program based on the Reynolds-averaged Navier-Stokes equations. The presented work considered two options of mechanization equally deflected over all the wingspan, namely δmech = 15° and δmech = 30°, without airscrews and with two-bladed airscrews placed on the wing tips and rotated symmetrically in the fuselage direction with the rotation frequency of N = 15000 rpm.
The flow-around patterns and pressure distribution are presented in dependence on the propelling screw blow-off. The authors gave a comparison of the computational results in the 2D and 3D problem setting, as well as airplane aerodynamic characteristics comparison of the without blow-off by the airscrews with the experimental data.
Numerical studies reveal that the presence of airscrew effect on the hinge moment value of the mechanization deflected depends on many factors, such as airscrew diameter and its design features, rotation frequency, its location, as well as blow-off and deflection angles. With the blow-off by the propelling airscrew, placed prior to the wing, local angles of attack on the wing and mechanization change, and the pressure at the windward side in the area of the blow-off by the airscrew
The blow of pulling airscrew, which mounted in front of the wing, influence on change local angle of attack wing and mechanization, decrees height of separate zone and increase pressure on windward side in the area of blowing airscrew.
Analysis of computation of profile and wing revealed that hinge moments computating in the 2D problem setting without blow-off may be employed for fast predicting the straight wing mechanization hinge moments values.
Keywords:
tractor airscrew, hinge moment, mechanization of the wing, extra-high aspect ratio wingReferences
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