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Wind Tunnels - Contenido educativo

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect Segment explaining wind tunnels and how they are used as research tools. It also explores the SR-71 Blackbird and why it's used as an ideal research test plane.

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What is a wind tunnel? How is a wind tunnel used as a measuring tool? Why is the SR-71 00:00:00
an ideal research test point? 00:00:10
Hi Jennifer. Hi. Hi Ben. Hi. Can you tell me what you might be having in our dynamics 00:00:12
problem with your vehicle? We do. Well, let me welcome you to my department, the Advanced 00:00:19
Measurements and Dynostics Branch. Here we make tools to measure the performance of an 00:00:24
aircraft in a wind tunnel. Now, a wind tunnel, isn't that just like a big fan? Well, let 00:00:28
me explain what a wind tunnel is and how we use it to measure aerodynamic forces like 00:00:33
draft. A wind tunnel is a device consisting of an enclosed passage to which air is driven 00:00:37
by a fan. The heart of a wind tunnel is the test section, in which a scale model is supported 00:00:42
in a controlled air stream that flows about the model, duplicating the air of the stream 00:00:47
of a full scale aircraft. We use different techniques to measure aerodynamic forces. 00:00:51
Things like flow visualization, use smoke, and a laser light sheet. Sometimes we use 00:00:56
oil or water instead of air and streams of dye to watch the vortices and other unusual 00:01:01
phenomena. Surface deformations, such as wind flexing, can affect drag. Here at NASA Langley, 00:01:07
one instrument that we designed projects a pattern laser light onto a surface of a model 00:01:15
being studied. Later we compare photographs and measure the differences in the pattern 00:01:19
light. These differences show changes in the shape of the wind surface that might be 00:01:24
disrupting the airflow. We call this turbulence. Data are collected during the testing and 00:01:29
checked for accuracy. Speaking of accuracy, it is not until an aircraft is flight tested 00:01:35
in the real world that design efficiency can be fully verified. NASA does most of its flight 00:01:41
testing at NASA Dryden and California Mojave Desert. As an aeronautical engineer at NASA 00:01:46
Dryden Flight Research Center, I'm interested in all the measurements that are made during 00:01:53
test and flight research missions. Blackbirds are the world's fastest and highest flying jets. 00:01:56
They cruise along at speeds over 2,000 miles per hour at heights over 24 kilometers or 00:02:02
above 80,000 feet. That's so high that when I look out the airplane's window, the sky seems 00:02:07
to be darker, even during the daylight. The SR-71's unique capabilities make it an ideal 00:02:13
platform for aeronautical research and experiments that are beyond the reach of any other jet. 00:02:20
All of these data, plus reports from the pilots, are compared with computer, wind tunnel, and 00:02:25
flight simulator information so that engineers will understand exactly what is happening with 00:02:30
the design. 00:02:34
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Idioma/s:
en
Materias:
Matemáticas
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
635
Fecha:
28 de mayo de 2007 - 16:53
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 36″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
15.56 MBytes

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