AERODYNAMIQUE CX  CZ EN SOUFFLERIE AERODYNAMIQUESAERODYNAMIQUE CX CZ EN SOUFFLERIE AERODYNAMIQUES

NASA wind tunnel see also:

Drag and Lift calculations with mecaflux:

Aerodynamics Hydrodynamics web app: aerodynamics-hydrodynamics-database

Aerodynamic wind tunnel

We will see in this lesson a few aerodynamic concepts.

Other links further information: the propeller fan and blower , the calculation of propeller, and software propeller calculation

 

When an object is immersed in a fluid stream, there is phenomena of friction and turbulence.

  • when the fluid is air, the study of these phenomena is the aerodynamics.

  • when the fluid is water, the study of these phenomena is the Hydrodynamics .

In the air , effects of friction are studied experimentally in wind tunnel.

it is in a wind tunnel that Cd ( aerodynamics coefficient of drag) and CL (coefficient lift ) Is studied according to the Aifoils or hydrofoils .

These results are often represented as Polar

 

concord supersonic testing

concord testing

 

wind tunnel eiffel

wind tunnel eiffel

(the engineer who created the tower devoted the rest of his life in aeronautics research)

 

NASA wind tunnel

 

From these experiments are derived information linking fluid characteristics and tested object. These tests are used to calculate coefficients of lif and drag versus numbers Reynolds :The coefficient Cd drag and the aerodynamic coefficient Cl lift . The formula for determining these coefficients is that used for calculating the lift and drag. The drag and lift are known by direct measurement of forces using systems of scales or dynamometers, thus determining the Cx Cz or by simple inversion of the equation:

 

Drag in Newtons

The Cz is the coefficient of lift, it is determined experimentally in wind tunnels or basin

p is the fluid density Kg/m3

S the projected surface ground m²

v the relative velocity of the fluid m / s

 

Lift force in Newtons
These data are stored for years of experiments in databases. The Wright brothers had built their wind tunnel and tested their profiles. Here is an application in java retrieved from the NASA website shows their experiments. The data on the polar plate curves for different width or length ratio radius curves ... remain very useful. You can recreate your file and enter the polar data in the foil Editor available in mecaflux .
the use of aerodynamic coefficient (Cd) drag and lift (Cl) is greatly facilitated in MECAFLUX because they are already entered for each selected object, you just have to choose the dimensions of your profile and parameters of fluid . If you want to use a profile that is not in the list a profiles mecaflux allows you to create one.
the airfoils in the software mecaflux

profile naca 0009

 

Calculation of drag and lift, of an airship hull, submarine or boat with the software HELICIEL

Aerodynamic lift and drag performance airship

 

mecaflux is a simplified software, calculation of wing or sail.

HELICIEL is a software wing propeller calculation sail more complete.

 

charge hydrostatique derive aerodynamique hydrodynamique construire aile foil construire eolienne dimensionner conduits fumée carene dirigeable construire helice propulsion derive aerodynamique hydrodynamique frottement sur une surface de coque trainée resistance au vent trainée resistance au vent construire eolienne trainée resistance au vent conception helice bateaux derive aerodynamique hydrodynamique carene dirigeable frottement sur une surface de coque construire aile foil construire aile foil conception hydrolienne calcul voile frottement sur une surface de coque trainée resistance au vent calcul voile construire aile foil construire eolienne construire helice propulsion aeraulique aspiration air systemes ventilation aeration pertes charges vannes debit et pression conduits pompes et ventilateurs vidange reservoir construire aile foil Logiciels de la suite Mecaflux Forces sur des objets géometriques dans un courant de fluide ramification et boucles réseaux dimensionner conduits fumée calcul systemes réseaux fluides gaz liquides helice a vitesse nulle sustentation resistance aerodynamique vehicules calcul debit rivierre helice de captage turbine Kaplan hydroelectrique charge hydrostatique carene dirigeable construire helice propulsion derive aerodynamique hydrodynamique