scholarly journals THE DRAG FORCE AND THE EFFECTIVE DIAMETER OF THE YARN IN THE AIR FLOW PERPENDICULAR TO THE YARN AXIS

1978 ◽  
Vol 34 (1) ◽  
pp. T24-T30
Author(s):  
Nobuo Iwaki ◽  
Genichi Yoshimura ◽  
Sukenori Shintaku ◽  
Kenji Sawayanagi
Keyword(s):  
Drag Force ◽  
Air Flow ◽  
Effective Diameter ◽  
Yarn Axis

scholarly journals THE AIR FLOW INFLUENCE ON THE DRAG FORCE OF A SPORTS CAR

2018 ◽  
Vol 12 (2) ◽  
pp. 121-127
Author(s):  
Zbigniew Czyż ◽  
Paweł Karpiński ◽  
Michał Gęca ◽  
Jacobo Diaz
Keyword(s):  
Drag Force ◽  
Air Flow

scholarly journals AIR FLOW ANALYSIS AROUND THE AUTOGYRO FUSELAGE

2017 ◽  
Vol 3 (1) ◽  
pp. 13-20 ◽  
Author(s):  
Zbigniew Czyż ◽  
Ibrahim Ilhan ◽  
Mert Akcay ◽  
Jacek Czarnigowski
Keyword(s):  
Drag Force ◽  
Lift Force ◽  
Air Flow ◽  
Flow Analysis ◽  
Angle Of Attack ◽  
Three Dimensional ◽  
Aerodynamic Forces ◽  
Ansys Fluent ◽  
Fluent Software

The paper presents the results of the simulation of the air flow around the gyroplane without the influence of the rotor and pusher propellers. Three-dimensional calculations were performed using ANSYS Fluent software. Based on the calculations, the values of the drag force and the lift force on each component of the rotorcraft were determined. Based on the results obtained, the effect of angle of attack on the aerodynamic forces was obtained.

Influence of a rough surface on the aerodynamic characteristics of a rotating cylinder

2021 ◽  
Vol 103 (3) ◽  
pp. 52-59
Author(s):  
N.K. Tanasheva ◽  
◽  
A.R. Bakhtybekova ◽  
A.Zh. Tleubergenova ◽  
L.L. Minkov ◽  
...  
Keyword(s):  
Rough Surface ◽  
Drag Force ◽  
Air Flow ◽  
Angle Of Attack ◽  
Experimental Studies ◽  
Rotating Cylinder ◽  
Aerodynamic Characteristics ◽  
Magnus Force ◽  
Lifting Force ◽  
Relative Roughness

The article considers the influence of the relative roughness of a cylindrical blade on aerodynamic characteristics. It is known that the operation basis of blades under consideration is the Magnus effect, which is characterized by appearance of a lifting force (Magnus force), when the cylinders rotate in a transverse flow. This force is used to rotate the wind wheel, similar to lifting force, but can have a much larger value when selecting optimal conditions, both geometric and aerodynamic. The authors conducted a comparative analysis of cylinder layout with a relative roughness (0.005 ÷ 0.02). Experimental studies of aerodynamics process of rotating cylinders were carried out in the aerodynamic laboratory using the T-1-M wind tunnel at an air flow value of 5 to 15 m/s. Graphs of dependences of rotating cylinder's lifting force and drag force on the changing air flow velocity and on relative roughness, k/d, are obtained. For further study experimental cylinder layout’s aerodynamic parameters, the most optimal is the variant with a relative roughness value of 0.02, which had high indicators, was selected. In the course of experimental studies, graphs of the dependence of the values of lift and drag force on the angles of attack of a single rotating cylinder with a rough surface on the speed and angle of attack of the wind flow (0°, 30° and 60°) were obtained. It is established that the effective angle of attack is 0°, at which aerodynamic characteristics’s maximum values were obtained.

Adequacy of effective diameter in predicting pressure gradients of air flow through packed beds with particle size distribution

2018 ◽  
Vol 112 ◽  
pp. 769-778 ◽  
Author(s):  
Jin Ho Park ◽  
Mooneon Lee ◽  
Kiyofumi Moriyama ◽  
Moo Hwan Kim ◽  
Eunho Kim ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Air Flow ◽  
Effective Diameter ◽  
Packed Beds ◽  
Pressure Gradients ◽  
Flow Through

scholarly journals Динамика капель, подброшенных над испаряющейся поверхностью воды

2021 ◽  
Vol 91 (9) ◽  
pp. 1331
Author(s):  
Д.Н. Габышев ◽  
Д.Н. Медведев ◽  
К.В. Мисиюк
Keyword(s):  
Drag Force ◽  
Capillary Wave ◽  
Air Flow ◽  
Maximum Size ◽  
Rate Of Change ◽  
Heated Region ◽  
Flow Parameters ◽  
Theoretical Approaches ◽  
Ballistic Experiment ◽  
Inhomogeneous Flow

The data of a ballistic experiment are analyzed, in which an intense capillary wave injects up microdroplets formed and levitated above a heated region of water due to an ascending convective steam-air flow. The drag force resisting the movement of a droplet is estimated. Using various theoretical approaches, the flow parameters (velocity at different heights, the rate of change of velocity) are estimated. The maximum size of droplets that can levitate freely has been determined. The impossibility of the stationary droplet levitation in a linearly inhomogeneous flow is shown.

Unidirectional Air Flow Isolators A Review

1974 ◽  
Vol 30 (1) ◽  
pp. 32-41 ◽  
Author(s):  
E. J. Butler ◽  
B. J. Egan
Keyword(s):  
Air Flow
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