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[en] A series of radio-controlled glider models was constructed by duplicating the aerodynamic shape of soaring birds (raven, turkey vulture, seagull and pelican). Controlled tests were conducted to determine the level of longitudinal and lateral-directional static stability, and to identify the characteristics that allowed flight without a vertical tail. The use of tail-tilt for controlling small bank-angle changes, as observed in soaring birds, was verified. Subsequent tests, using wing-tip ailerons, inferred that birds use a three-dimensional flow pattern around the wing tip (wing tip vortices) to control adverse yaw and to create a small amount of forward thrust in gliding flight.
Journal
Bioinspiration and Biomimetics (Online); ISSN 1748-3190; 
; v. 5(4); [7 p.]
; v. 5(4); [7 p.]
[en] Author considers the formulation and algorithms of the nonstationary problem for calculation of temperature fields of shell of revolution in high-temperature aerodynamic flow with known temperature. The physical model and calculation of temperature fields in the frontal part and in circle sections of the shell of revolution are also proposed
[ru]
В работе рассматриваются постановка и алгоритмы решения нестационарной задачи расчета температурных полей оболочки вращения в высокотемпературном аэродинамическом потоке с заданной температурой. Предлагаются физическая модель и алгоритмы расчета температурных полей в лобовой части и в окружных сечениях оболочкиJournal
Izvestiya Vysshikh Uchebnykh Zavedenij. Yadernaya Ehnergetika; ISSN 0204-3327; ; (no.4); p. 102-108
; (no.4); p. 102-108
[en] The size of sports fields considerably varies from a few meters for table tennis to hundreds of meters for golf. We first show that this size is mainly fixed by the range of the projectile, that is, by the aerodynamic properties of the ball (mass, surface, drag coefficient) and its maximal velocity in the game. This allows us to propose general classifications for sports played with a ball. (paper)
Journal
New Journal of Physics; ISSN 1367-2630; ; v. 16(3); [13 p.]
; v. 16(3); [13 p.]
[en] The requirements on the use of titanium alloys used as thermal protection in hypersonic airplanes are considered. The ignition of titanium alloys in aerodynamic heating is analyzed. A mathematical model is proposed for the surface oxidation of the alloys in a high-temperature air flux.
Journal
Russian Engineering Research; ISSN 1068-798X; ; v. 39(1); p. 25-30
; v. 39(1); p. 25-30
No abstract available
Journal
[en] RANS and URANS modeling of flow past simplified vehicle bodies with wheelhouses and rotating wheels have been carried out in order to understand the flow phenomena through detailed analyses of flow in the wheelhouses. The vortex skeleton method was used to characterize the flow structure. The second invariant of the velocity gradient tensor (Q) and iso-surfaces of total pressure have been applied for detecting dynamically significant vortical structures. It was found that the flow field in the wheelhouse can be characterized by several large recirculation zones, of which six can be classified as qualitatively independent of the grid, numerical scheme, turbulence model and the shape of the vehicle body. The change of flow field structure was investigated for various wheelhouse geometries, and for closed lower and/or lateral gaps between the wheelhouse and the external flow field. Aerodynamic forces acting on the body, wheelhouse and wheel were determined separately for different configurations
Journal
[en] The article deals with forming an aerodynamic model of worked out areas serving to calculate leak in it taking into account degassing. (author)
Journal
Vestnik Karagandinskogo Universiteta; ISSN 1560-7836; ; v. 2(38); p. 61-64
; v. 2(38); p. 61-64
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