Open AccessSHAPE MEMORY ALLOY ACTUATORS ARE USED TO CREATE A VARIABLE AREA JET NOZZLE FOR NOISE REDUCTION: A REVIEW
Author(s) -
Shubham Chavan,
Pratap Gujar
Publication year - 2021
Publication title -
international journal of engineering applied science and technology
Language(s) - English
Resource type - Journals
ISSN - 2455-2143
DOI - 10.33564/ijeast.2021.v06i03.043
Subject(s) - nozzle , actuator , mach number , takeoff , jet (fluid) , jet noise , mechanical engineering , automotive engineering , engineering , structural engineering , aerospace engineering , electrical engineering
The real study details the design andimplementation of Shape memory alloy actuators toproduce a noise-reducing variable area jet nozzle. Asubscale design specification of a changeable area jetnozzle was created using SMA actuators in anasymmetrical design. Commercial transportation planesmust be quieter, cleaner, and more efficient, according tothe international community. The aviation industry isreacting by developing new technology in order to achievethose objectives. Changing the area of a commercial jetengine's fan nozzle can result in substantial noisereduction and reduced fuel economy. At takeoff andapproach, a bigger diameter reduces jet velocity, whichreduces noise. In cruise, adjusting the diameter to accountfor variable Mach numbers, altitude, and other factorshelps optimise fan loading and minimise fuel consumptionand emissions. Boeing has tested a 20 percent area changescaled variable area jet nozzle. At the nozzle exit, ShapeMemory Alloy actuators were utilised to place 12interlocking panels. To maintain a range of consistentdiameters with variable flow circumstances and to alterthe diameter under constant flow conditions, a closed loopcontrol system was utilised. At each condition, acousticdata was gathered using side line microphones, and flowfield measurements were taken using PIV at various crosssections. The design of a variable area nozzle is explainedin this work. The diameter of the nozzle and its influenceon acoustic performance are discussed. The effects of thejoints between the interlocking panels are seen in the flowfield data.