Theory calculation and modeling of screew propellers and wings

Theory calculation and modeling screw propellers and wings

The designer of propellers or wings, HELICIEL software user, do not always have time to go into the theory, but an exact knowledge of formulas and theories used to obtain the results will be useful to engineers wishing to understand, and thus verify the parameters of the project.. .

Performance of a screw propeller calculated Blade element momentum theory: BEMdisplayed in HELICIEL

Predictions of performance, such as power, lift and torque, wing or screw propeller is based on mathematical practical tools that you will find assembled here (in part) .

Thank you Sirs for Newton, Reynolds, Bernoulli, Beeckman, Froude, Prandtl Glauert ... and many others who have inspired them even (Descartes Archimedede, Pythagoras, Euclid ... for thinking, taking notes when they were inspired, and have kindly allowed the rest of humanity to read the results of their work.Other bibliographic sources and Internet will respectfully mentioned in detail. Some definitions will be directly consulted on partner sites like: mecaflux.com ...

THEORIES common to propellers and wings :

Continuity equation. The volume flow is the result of the speed in the pipe section ....
Newton and Conservation of momentum reminds us that our actions generate reactions.
Reynolds gave us a bridge between the different fluids and different scales ...
Bernoulli offers a vision of balance of energy contained in a fluid stream which allows us to predict what state pressure and speed are the observed areas...

THEORIES common to propellers:

The vortex theory of Prandtl (1918) allows us to pass 2D performance profile, the 3D performance by providing a method of calculating loss of lift depending on the distance of the blade tip.The vortex theory brings a correction factor, integrated method of blade element, allows for more accurate results.. you will find in the references, wings and propellers, links, and documents about this theory and more precisely: an explanation of the vortex theory applied to screw propellers, wing calculation finite span and lifting line

Theories turbines (propellers energy harvesting):

Froude theory invites us to consider the velocities induced by the change of momentum here in a wind turbine or tidal turbine
Blade element momentum theory: BEM for wind turbines and tidal turbines allows us to define the axial and tangential velocities induced distributed along the blade. Dividing the blade elements and introducing performance profiles elements..

Theories propellers thruster :

Froude theory invites us to consider the velocities induced by the change of momentum here in a screw propeller, propellent
Blade element momentum theory: BEM (applied here to the screw propeller traction or propulsion) allows us to define the axial and tangential velocities induced distributed along the blade. Dividing the blade elements and introducing performance profiles elements...