SPAN WISE BLOWING ON SWEPT BACK WING TO GENERATE HIGH VORTEX LIFT
Author(s):
BHOOMIKA A H, ARPITHA V V, MOHAMMED AAQIL NAWAZ, RAMPRASAD KADAM
Keywords:
Span-wise blowing, increasing lift, increasing stalling angle
Abstract
An investigation has been conducted to evaluate the aerodynamic effects associated with spanwise blowing over a swept back wing’s upper surface in a direction parallel to leading edge. Experimental pressure and force data were obtained on the wing having sweep angle of 30 degree and showed that span wise blowing aids in the formation and control of leading edge vortex and hence significantly improves the aerodynamic characteristics at higher angle of attack. Full vortex section lift is achieved at inboard span station with a small blowing rate, but successively higher blowing rates are necessary to attain the full vortex level at increased span distances. Span wise blowing generates large increase in lift at high angles of attack, improves the induced drag polar, delayed wing stall to higher angles of attack and extends the linear pitching moment to high lifts. Span wise blowing is a method used for increasing the lift of a wing or other aerodynamic lifting surface. The span wise blowing is given more preference for producing lift than the high lift devices that is the different types of flaps. The use of high lift devices will produce more lift along with the increased drag but the span wise blowing of a wing would produce increase in lift with reduced amount of drag that is the amount of drag produced may be negligible when compared to total lift. Introducing this concept in the fighter aircraft design offers the possibility of increasing excess power for manoeuvring at high load factors (during high rate of angular rotation). The conclusion is the span wise blowing helps in reattaching the flow and establishing a healthy leading edge vortex on the upper surface of the wing and therefore increasing the lift.
Article Details
Unique Paper ID: 146497

Publication Volume & Issue: Volume 4, Issue 12

Page(s): 741 - 745
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