R.-T. GLAZEBROOK. — On the molecular vortex theory of electromagnetic action (Théorie de l'électromagnétisme fondée sur les tourbillons moléculaires ) ; Phil. Mag., 5e série, t. XI, p. 381-413; 1881

1882 ◽  
Vol 1 (1) ◽  
pp. 510-511
Author(s):  
B. Élie
Keyword(s):  
Electromagnetic Action ◽  
Vortex Theory

scholarly journals Application of the Vortex Theory to High-speed Horizontal-axis Wind Turbines

1984 ◽  
Vol 27 (229) ◽  
pp. 1460-1466 ◽  
Author(s):  
Hiroshi MAEKAWA
Keyword(s):  
Wind Turbines ◽  
High Speed ◽  
Horizontal Axis ◽  
Vortex Theory ◽  
Horizontal Axis Wind Turbines

The Martian polar vortex: Theory of seasonal variation and observations of eolian features

1979 ◽  
Vol 84 (B9) ◽  
pp. 4634 ◽  
Author(s):  
Richard G. French ◽  
Peter J. Gierasch
Keyword(s):  
Seasonal Variation ◽  
Polar Vortex ◽  
Vortex Theory

scholarly journals THE VORTEX THEORY OF AIRSCREW AND SOME OF ITS APPLICATIONS

1927 ◽  
Vol 1927 (40) ◽  
pp. 159-186
Author(s):  
Sandi Kawada
Keyword(s):  
Vortex Theory

scholarly journals VORTEX DESCRIPTION OF QUANTUM HALL FERROMAGNETS

2010 ◽  
Vol 25 (05) ◽  
pp. 993-1008 ◽  
Author(s):  
TARO KIMURA
Keyword(s):  
Incompressible Fluid ◽  
Moduli Space ◽  
Composite Particle ◽  
Matrix Theory ◽  
Quantum Hall ◽  
Effective Theory ◽  
Particle State ◽  
Coupling Region ◽  
Vortex Theory ◽  
Chern Simons

We study particle states of quantum Hall ferromagnet from the viewpoint of the incompressible fluid description. It is shown that phase space of Chern–Simons matrix theory which is an effective theory for the incompressible fluid is equivalent to moduli space of vortex theory. According to this correspondence, elementary excitations in vortex theory are identified as particle states in quantum Hall ferromagnet, and thus we propose that a pure electron state is absent from the strong coupling region but only a composite particle state is present.

A New Approach to Animal Flight Mechanics

1979 ◽  
Vol 80 (1) ◽  
pp. 17-54 ◽  
Author(s):  
J. M. V. RAYNER
Keyword(s):  
Body Mass ◽  
Large Body ◽  
Simple Expression ◽  
The Body ◽  
Flight Mechanics ◽  
Total Power ◽  
Forward Flight ◽  
Vortex Theory ◽  
Rate Of Increase ◽  
Total Power Consumption

The mechanics of lift and thrust generation by flying animals are studied by considering the distribution of vorticity in the wake. As wake generation is not continuous, the momentum jet theory, which has previously been used, is not satisfactory, and the vortex theory is a more realistic model. The vorticity shed by the wings in the course of each powered stroke deforms into a small-cored vortex ring; the wake is a chain of such rings. The momentum of each ring sustains and propels the animal; induced power is calculated as the rate of increase of wake kinetic energy. A further advantage of the vortex theory is that lift and induced drag coefficients are not required; estimated instantaneous values of these coefficients are generally too large for steady state aerodynamic theory to be appropriate to natural flapping flight. The vortex theory is applied to hovering of insects and to avian forward flight. A simple expression for induced power in hovering is found. Induced power is always greater than simple momentum jet estimates, and the discrepancy becomes substantial as body mass increases. In hovering the wake is composed of a stack of horizontal, coaxial, circular vortex rings. In forward flight of birds the rings are elliptic; they are neither horizontal nor coaxial because the momentum of each ring balances the vector sum of parasite and profile drag and the bird's weight. Total power consumption as a function of flight velocity is calculated and compared for several species. Power reduction is one of the major factors influencing the choice of flight style. A large body of data is used to obtain an approximate scaling between stroke period and the body mass for birds. Together with relations between other morphological parameters, this is used to estimate the variation of flight speed and power with body mass for birds, and on this basis deviations from allometric scaling can be related to flight proficiency and to the use of such strategies as the bounding flight of small passerines. Note: Present address: Department of Zoology, University of Bristol, Woodland Road, Bristol BS8 IUG, U.K.

A Note on the Design of Wake-Adapted Propellers

1980 ◽  
Vol 24 (04) ◽  
pp. 227-231
Author(s):  
Gilbert Dyne
Keyword(s):  
Vortex Theory ◽  
The Difference ◽  
Wake Model ◽  
Effective Wake ◽  
Leveling Effect

Problems associated with the design of wake-adapted propellers are illustrated by results obtained from a simple propeller and wake model. It is shown that the widely used approach of the vortex theory gives much-too-low induced axial velocities at the inner radii of the propeller, which results in too-low blade pitch ratios. The reason for this is that no regard is paid to the fact that the vorticity of the approaching flow is changed by the propeller. If this changing vorticity is introduced in the vortex theory, its shortcomings are eliminated. An effect of the improvement is that the effective wake at the propeller plane differs from the nominal wake. The difference depends upon the propeller load. The propeller is shown to have a leveling effect on a nonuniform axisymmetric nominal wake.

Sign in / Sign up

Export Citation Format

Share Document