Tugas Akhir Mesin
ANALISA AERODINAMIK AIRFOIL MODIFIKASI MICROTAB PADA PENGARUH TINGGI TAB
Aerodynamic performance is one of the
important points in designing wind turbines in converting
the kinetic energy contained in the wind. Nowadays
there have been so many researches done in an effort to
get an airfoil design for wind turbines that suits your
needs. The purpose of this study was to determine the
effect of variations in the dimensions of tabs on
variations of angle of attack on the behavior of stall airfoil
and determine the effect of tab heights on the lift
coefficient (CL) and drag coefficient (CD) on airfoil with
microtabs with tab heights of 1.1% C, 2, 2% C and 3.3%
C in the upper and lower surfaces using CFD.
From the results of CFD simulations on the
Wortmann fx63-137 airfoil showed that the addition of
microtabs to the Wortmann fx63-137 airfoil for the lower
surface had the effect of increasing the lift force and lift
coefficient at the heights of 1.1% C, 2.2% C and 3.3 %
C, the increase occurred consistently and stall occurred
at an angle of 26o for a tab height of 1.1% C, 22o
for a
tab height of 2.2% C and at a tab height of 3.3% C a stall
occurred at an angle of 20o
. On the upper surface,
microtabs addition caused a decrease in lift force
compared to the lower surface and stalls occurred at
angle of 22o
for all tab heights. For the drag coefficient,
where the drag coefficient also increased as the
increasing of the attack angle
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