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Ver la versión completa : "Pelican" vs."Non-Pelican" F1's car nose brief CFD analysis



llumia
18/06/2013, 11:58
I exhibit below, a brief report related to the influence of a “bulge” on the airflow that goes through the underside of a F1's car nose.

Before I do anything else, I want to thank my fellow at f1-gears.com, Roller, who very kindly, made both geometries with Catia code.


These are both noses (non-pelican/pelican), imported to the meshing code (Gambit):


The “non-pelican” nose:

http://s18.postimg.org/nl7inng4p/nopelikroller.jpg (http://postimg.org/image/db53oeq91/full/)
subir fotos online (http://postimage.org/index.php?lang=spanish)


The “pelican” nose:

http://s29.postimg.org/pgg8jwron/pelikroller.jpg (http://postimg.org/image/hay6lr3fn/full/)
sube imagenes (http://postimage.org/index.php?lang=spanish)


As in the previous step-less vs. stepped F1's car nose brief CFD analysis:

- 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).

- 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 “non-pelican” nose:

http://s29.postimg.org/kgrz3g0tj/nopelikvelocityvectors.jpg (http://postimg.org/image/gx61dmy3n/full/)
imag (http://postimage.org/index.php?lang=spanish)


Enlarged view of the above image:

http://s28.postimg.org/hyfa8c88d/nopelikvelocityvectorszoomtrial1.jpg (http://postimg.org/image/8149fa0mh/full/)
subir fotos gratis (http://postimage.org/index.php?lang=spanish)


This is the velocity vectors chart, for the “pelican” nose:

http://s30.postimg.org/d3akczzdt/pelikvelocityvectors.jpg (http://postimg.org/image/8u5uatw4d/full/)
imagenes gratis (http://postimage.org/index.php?lang=spanish)


Enlarged view of the above image:

http://s17.postimg.org/9vo0bnvrj/pelikvelocityvectorszoomtrial1.jpg (http://postimg.org/image/maasbzn9n/full/)
imagen (http://postimage.org/index.php?lang=spanish)


Velocity vectors comparative chart for both noses:

http://s13.postimg.org/3sv76ffcn/compnopelikpelikvelocityvectors.jpg (http://postimg.org/image/a6ka9ok8j/full/)
subefotos (http://postimage.org/index.php?lang=spanish)


We can see, that the presence of the bulge under the nose increases airflow's speed.


Enlarged view of the above image:

http://s8.postimg.org/4tu5kjw79/compnopelikpelikvectorszoomtrial1.jpg (http://postimg.org/image/4tu5kjw75/full/)
sube imagenes (http://postimage.org/index.php?lang=spanish)


In addition to velocity vectors, we are able to analyse velocity and static pressure contours, too.


If we look at the contours of velocity, we can see how airflow's speed increases for the “pelican” nose case.

http://s9.postimg.org/53sizmnvz/compnopelikpelikcontourvelocity.jpg (http://postimg.org/image/7xvod2q23/full/)
subir imagen (http://postimage.org/index.php?lang=spanish)


Enlarged view of the above image:

http://s24.postimg.org/f7tytx2p1/compnopelikpelikcountvelocityzoomtrial1.jpg (http://postimg.org/image/4l05ohujl/full/)
subirimagenes (http://postimage.org/index.php?lang=spanish)


Static Pressure contours comparative chart for both noses:

http://s28.postimg.org/mck396ral/compnopelikpelikcontourprestatic.jpg (http://postimg.org/image/pw60yzu09/full/)
sube imagenes (http://postimage.org/index.php?lang=spanish)


Enlarged view of the above image:

http://s7.postimg.org/ijxu32i57/compnopelikpelikcountprestaticzoomtrial1.jpg (http://postimg.org/image/su092b80n/full/)
imagen jpg (http://postimage.org/index.php?lang=spanish)


For the “pelican” case, there will have a bigger static pressure gradient, in other words, the “pelican” nose (such as they[both noses] were drawn) will create “more downforce” than the “non-pelican” one.


We should note that, because we have not taken into account the front wing elements (main profile, flaps, etc.), after the iterative process we obtain “positive” values of the coefficient “cl” (downforce coefficient).


More than the values obtained for the downforce coefficient, what is truly important here, is its change as the “non-pelican” or the “pelican” one, may be the case.


“Non-pelican” nose results:

http://s12.postimg.org/4dvol9qod/iternopelik.jpg (http://postimg.org/image/kc4ebekw9/full/)
subir foto (http://postimage.org/index.php?lang=spanish)


“Pelican” nose results:

http://s13.postimg.org/pqsq1qec7/iterpelik.jpg (http://postimg.org/image/68y2lsheb/full/)
sube imagenes (http://postimage.org/index.php?lang=spanish)


We can see that clpelican<clnon-pelican, in other words, the presence of such a bulge underneath of the nose, induces a “more negative (smaller)” downforce coefficient (0.23<0.30).


I hope you liked it.


Regards, MarleneKberg.

dfgh
26/05/2020, 13:17
Pelican is giving some advantages and it is the new trend of this last seasons.