# flow speed vs CL

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 January 18, 2013, 07:21 flow speed vs CL #1 New Member   Wheeler Join Date: Jan 2013 Posts: 24 Rep Power: 6 Sponsored Links 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! Last edited by shlgzz; January 18, 2013 at 09:06. Reason: adding

January 18, 2013, 11:53
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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

 January 19, 2013, 02:49 #3 New Member   Wheeler Join Date: Jan 2013 Posts: 24 Rep Power: 6 cfd seeker,thank you so much.

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