Video Experimental Relacionado
Updated: Dec 3, 2025
12:09
Building an Enhanced Flight Mill for the Study of Tethered Insect Flight
Published on: March 10, 2021
3.3K
La aerodinámica del colibrí en vuelo flotante
Douglas R Warrick1, Bret W Tobalske, Donald R Powers
1Department of Zoology, Oregon State University, 3029 Cordley Hall, Corvallis, Oregon 97331, USA. warrickd@science.oregonstate.edu
Nature
|June 24, 2005
Resumen
Los colibríes generan la mayor parte de su elevación flotante durante el golpe descendente, a diferencia de los insectos. Esta asimetría de fuerza, impulsada por la inversión del ala, distingue el vuelo aviar a pesar de las similitudes en la dinámica de los vórtices.
Área de la Ciencia:
- La biomecánica es la biomecánica.
- La aerodinámica es muy importante.
- Ornitología Ornitología.
Sus antecedentes:
- A menudo se asume que los colibríes (Trochilidae) usan mecanismos aerodinámicos parecidos a los de los insectos para flotar.
- La simetría cinemática en los latidos de las alas de los colibríes sugiere la generación de elevación igual durante el movimiento ascendente y descendente.
- Esta suposición influye en los modelos aerodinámicos y los estudios empíricos del vuelo de los colibríes.
Objetivo del estudio:
- Para investigar la asimetría de la producción de fuerza durante el vuelo en colibríes.
- Para comparar los mecanismos aerodinámicos de los colibríes con los de los insectos.
- Para analizar el papel de la cinemática del ala y la morfología en el vuelo de los colibríes.
Principales métodos:
- Se utilizó la velocimetría de imagen de partículas digitales (DPIV) para medir la estela de los colibríes rufos (Selasphorus rufus).
- El análisis se centró en la estructura de la estela para inferir las fuerzas aerodinámicas.
- La cinemática y la morfología de las alas se consideraron en relación con la generación de fuerza.
Principales resultados:
- Los colibríes exhiben una asimetría de fuerza significativa, generando el 75% del soporte de peso durante el golpe descendente y el 25% durante el golpe ascendente.
- La inversión del ala durante el golpe hacia arriba probablemente contribuye a esta asimetría de la fuerza.
- Los vórtices de vanguardia observados durante el golpe descendente sugieren una operación a bajos números de Reynolds, similar a los insectos.
Conclusiones:
- El vuelo del colibrí se caracteriza por la asimetría de la fuerza, en contraste con la contribución igual asumida de los movimientos ascendentes y descendentes.
- A pesar de las similitudes en la dinámica de los vórtices con los insectos, el vuelo de los colibríes es distinto debido al plano corporal de las aves.
- El estudio destaca las estrategias aerodinámicas únicas empleadas por los colibríes.
Videos de Conceptos Relacionados
01:23Lift
364
Lift is a fundamental aerodynamic force that acts perpendicular to the direction of airflow. It plays a central role in achieving and sustaining flight and in stabilizing various vehicles. Lift primarily originates from pressure differences created across surfaces, such as an airfoil. A lower pressure region forms above the wing, while a higher pressure region forms below it, generating an upward force. This differential results from the shape and orientation of the airfoil, enabling the wing...
364
01:24Absolute Motion Analysis- General Plane Motion
423
Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
423
01:23Steady, Laminar Flow in Circular Tubes
749
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...
749
01:11Buoyancy and Stability for Submerged and Floating Bodies
2.3K
In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
2.3K
01:17Steady, Laminar Flow Between Parallel Plates
635
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
635
01:01Bernoulli's Principle
11.2K
Bernoulli's equation incorporates how fluid pressure changes across a static, incompressible fluid by equating the kinetic energy contribution to zero. It is also helpful in analyzing horizontal flows in which the gravitational energy density is constant throughout. The latter equation is so useful that it is called Bernoulli's principle. According to Bernoulli's principle, the fluid pressure drops if the speed increases and vice versa.
Bernoulli's principle has several...
Bernoulli's principle has several...
11.2K