The real study details the design and
implementation of Shape memory alloy actuators to
produce a noise-reducing variable area jet nozzle. A
subscale design specification of a changeable area jet
nozzle was created using SMA actuators in an
asymmetrical design. Commercial transportation planes
must be quieter, cleaner, and more efficient, according to
the international community. The aviation industry is
reacting by developing new technology in order to achieve
those objectives. Changing the area of a commercial jet
engine's fan nozzle can result in substantial noise
reduction and reduced fuel economy. At takeoff and
approach, a bigger diameter reduces jet velocity, which
reduces noise. In cruise, adjusting the diameter to account
for variable Mach numbers, altitude, and other factors
helps optimise fan loading and minimise fuel consumption
and emissions. Boeing has tested a 20 percent area change
scaled variable area jet nozzle. At the nozzle exit, Shape
Memory Alloy actuators were utilised to place 12
interlocking panels. To maintain a range of consistent
diameters with variable flow circumstances and to alter
the diameter under constant flow conditions, a closed loop
control system was utilised. At each condition, acoustic
data was gathered using side line microphones, and flow
field measurements were taken using PIV at various crosssections. The design of a variable area nozzle is explained
in this work. The diameter of the nozzle and its influence
on acoustic performance are discussed. The effects of the
joints between the interlocking panels are seen in the flow
field data.
SHAPE MEMORY ALLOY ACTUATORS ARE USED TO CREATE A VARIABLE AREA JET NOZZLE FOR NOISE REDUCTION: A REVIEW
