How do you measure aerodynamics in a wind tunnel?
Table of Contents
How do you measure aerodynamics in a wind tunnel?
Measuring Aerodynamics in a Wind Tunnel
- Flow probes for wind tunnels. Multi-hole probes and Kiel probes are two examples of flow measurement devices that can be strategically placed inside a wind tunnel for measuring pressure, velocity, and flow angle.
- Multi-hole probes.
- Kiel probes.
- Rakes in a wind tunnel.
What is wind tunnel in aerodynamics?
Wind tunnels are large tubes with air moving inside. The tunnels are used to copy the actions of an object in flight. Researchers use wind tunnels to learn more about how an aircraft will fly. NASA uses wind tunnels to test scale models of aircraft and spacecraft.
What are measurement techniques in wind tunnels?
This section gives an overview on various measurement methods and testing techniques used in our wind tunnels. We develop new measurements methods : PSP techniques (High speed, low speed, unsteady) ; MDM (Model Deformation Method) ; aero-acoustic measurements.
How do you measure aerodynamics?
The aerodynamic force which acts on a freely flying model can be determined by measuring the acceleration of the model. The accelerations of flying models or full-scale objects in flight tests are measured by accelerometers.
How do you test aerodynamic drag?
ยป Wind Tunnel Testing. This method uses a test chamber in which a stationary vehicle, in most cases a scale model, is exposed to a controlled air flow. The measurement of the horizontal force experienced by the vehicle is used to estimate the aerodynamic drag.
What is Coastdown testing?
Coastdown testing is the process of accelerating a vehicle to a high speed on a flat, straight road and coasting in neutral down to a low speed. By recording the amount of time the vehicle takes to slow down, it is possible to obtain a model of the loss- inducing forces affecting the vehicle.
What is drag test?
Drag tests were conducted to determine the effect of speed on the coefficient of friction for a motor vehicle sliding upside down. Eight different vehicles were tested on various road surfaces. Three drag test methods were used to generate redundant data; constant speed, varying speed and slide to stop.
What does Coastdown mean?
An action that permits the reactor power level to decrease gradually as the fuel in the core is depleted.
How is aerodynamic drag measured?
The drag equation states that drag D is equal to the drag coefficient Cd times the density r times half of the velocity V squared times the reference area A. For given air conditions, shape, and inclination of the object, we must determine a value for Cd to determine drag.
