PDA

Ver la versión completa : Step-less vs. Stepped F1's car nose brief CFD analysis



llumia
11/02/2013, 12:39
I exhibit below, a brief report related to the influence of a “step” on the airflow through the nose of a F1's car.


These are both noses (step-less/stepped), imported to the meshing code (Gambit):


The step-less nose:

http://s28.postimg.org/4o4ubqtv1/nomorro2l8dwen.jpg (http://postimg.org/image/i51sum46h/full/)
sube (http://postimage.org/index.php?lang=spanish)


The stepped one:

http://s27.postimg.org/mh7g3tuj7/morro2l8bwen.jpg (http://postimg.org/image/ebpe5o6a7/full/)
subir gif (http://postimage.org/index.php?lang=spanish)

They have been used the real length between lines A-A and B-B (925 mm) besides the minimum external dimension (vertical) at the section A-A (275 mm) and the minimum external dimension (vertical) at the section B-B (400mm).

http://s11.postimg.org/i8a2tnjnn/nomorro2l8c6wen.jpg (http://postimg.org/image/n6xl86ngf/full/)
subir imagenes gratis (http://postimage.org/index.php?lang=spanish)

http://s10.postimg.org/vb5zal7tl/morro2l8bruleswen.jpg (http://postimg.org/image/fponqmvv9/full/)
sube (http://postimage.org/index.php?lang=spanish)

It has been set, too, an airflow's speed of 50m/s because, that's the maximum allowed by FIA (2013 Formula One Sporting Regulations) during wind tunnel testing [Rule 22.10].

This is the velocity vectors chart, for the step-less nose:

http://s10.postimg.org/xy3vahsk9/nomorro2l8f4aoazeroa1casedatawen.jpg (http://postimg.org/image/58gzduok5/full/)
sube imagenes (http://postimage.org/index.php?lang=spanish)


We can see that airflow's speed is growing gradually from the nose tip.

The image before, zoomed:

http://s27.postimg.org/low1wisib/nomorroaoazeroadetailwen.jpg (http://postimg.org/image/yt1m97kjz/full/)
subir imagenes (http://postimage.org/index.php?lang=spanish)


The velocity vectors chart, for the stepped nose:

http://s9.postimg.org/fp09pspun/morro2l8e6aoazeroacasedatawen.jpg (http://postimg.org/image/yu3izk4ij/full/)
subefotos (http://postimage.org/index.php?lang=spanish)

We are able to notice changes when compared to the previous case.

http://s11.postimg.org/3rwgpxpvn/compnomorromorroaoazeroawen.jpg (http://postimg.org/image/q3u9jbozj/full/)
subir fotos online (http://postimage.org/index.php?lang=spanish)


In this case, airflow's speed decreases when it is approaching the bottom of the step. After that, airflow's speed, starts to be increased again, reaching the “maximum” at the top of the step.


The step area, zoomed:

http://s13.postimg.org/b2zbuem1j/morroaoazeroadetailwen.jpg (http://postimg.org/image/nudi0wvtf/full/)
subir imagenes (http://postimage.org/index.php?lang=spanish)


In closing, I let you, a comparative chart of the same nose's area (step-less/stepped):

http://s13.postimg.org/7ra7sl91z/compnomorromorroaoazeroadetailwen.jpg (http://postimg.org/image/so6fx972r/full/)
subir foto (http://postimage.org/index.php?lang=spanish)


I hope you liked it.


Regards, MarleneKberg.


:bruji2: