two airfoil elements

Ashish22 · May 9, 2013, 03:27

hi

i am doing numerical analysis of two airfoils separated by distance
i got results for 2 cases, both airfoils have same dimensions...
case 1 airfoils separated by dist. 100 mm
case 2 airfoils separated by dist. 400 mm

in case 1 lower airfoil generate much higher lift (.192) compare to lower airfoil in case 2 (0.08)

lift generated by upper airfoil is approximately same for both cases

i am adding pressure contours for both case
please someone explain the reasons

Aeronautics El. K. · May 9, 2013, 07:25

This happens because of the aerodynamic interraction between the airfoils. You should be expecting something like this to happen.

sorkhani · June 8, 2013, 06:08

by adding an airfoil above another, the velocity between two airfoil (above the lower airfoil) has been increased, therefor the pressure will be decreased and lift force will be increased.
by decreasing the distance between two airfoils the Phenomenon will be intensified.

May 9, 2013, 07:25		#2
Aeronautics El. K. Senior Member Lefteris Join Date: Oct 2011 Location: UK Posts: 337 Rep Power: 15	This happens because of the aerodynamic interraction between the airfoils. You should be expecting something like this to happen. __________________ Lefteris

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June 8, 2013, 06:08		#3
sorkhani New Member ali Join Date: Jul 2009 Posts: 12 Rep Power: 16	by adding an airfoil above another, the velocity between two airfoil (above the lower airfoil) has been increased, therefor the pressure will be decreased and lift force will be increased. by decreasing the distance between two airfoils the Phenomenon will be intensified.