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-   -   flow speed vs CL (http://www.cfd-online.com/Forums/fluent/111939-flow-speed-vs-cl.html)

shlgzz January 18, 2013 07:21

flow speed vs CL
 
Hi,all.During the simulation,I encountere three questions .
1.For airfoil,the higher flow speed,the higher CL,isn't it right?
2.The same airfoil of different chord lengths,how could I ensure the same Cl? The same Re number or something else?
3.Is the lift of airfoil proportional to the chord length?
Any kind of help be appreciated.
Thank you in advance.
Best regards!

cfd seeker January 18, 2013 11:53

Quote:

.For airfoil,the higher flow speed,the higher CL,isn't it right?
no wrong. CL is inversely propotional to velocity as defined by relation CL=L/0.5*density*V^2*S

Quote:

The same airfoil of different chord lengths,how could I ensure the same Cl? The same Re number or something else?
Yup same Re. No and also same Mach. No if the flow is supersonic

Quote:

Is the lift of airfoil proportional to the chord length?
Obviously increase in chord means increase in surface area. More surface area will produce more lift

shlgzz January 19, 2013 02:49

cfd seeker,thank you so much.


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