Abstract:
The research explores the application of bladeless fan technology in commercial and
aerospace industry, starting with its optimization in a constrained environment as a
bladeless ceiling fan. The study utilizes One Factor at a Time (OFAT) methodology
and Design of Experiment (DOE) techniques to optimize geometric parameters of
bladeless ceiling fan for enhanced air delivery, expanded comfort zones, and
significantly lower power consumption compared to traditional ceiling fans. The
perceived comfort level for each factor was estimated in accordance with American
Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) standard
ASHRAE-55. It was concluded that a finer jet width and/or bigger radii with the jet
orientated vertically down increases velocity spread, thus increasing the comfort zone.
Circular profiles were found more efficient than airfoil shapes, with optimized
parameters (1.4 m fan diameter, 0.00255 m jet width, 91.21o
orientation angle, and 3.0
m/s of jet velocity) enhancing air delivery by 60%, extending the comfort zone by 76%,
and reducing power consumption by 43%. Building on this, the research investigates
the potential of bladeless fans in aerospace applications. At present, the application of
bladeless fans in aerospace industry is almost negligible with no real-world application
based on bladeless fan exists. Evaluation of annular and semi-annular bladeless fans
(fanjets) indicates their potential in modifying aircraft wing aerodynamics. The leading edge (LE) location for fanjet was more effective than trailing edge (TE). Similarly,
spanwise distribution of fanjet on aircraft wing produces higher Lift to Drag (L/D)
ratios. Simulations and wind tunnel tests demonstrate that a triple-fanjet configuration
is particularly effective, achieving higher lift values and improved L/D ratios compared
to single or dual fanjet configurations. Wind tunnel tests on a modified propeller
Unmanned Arial Vehicle (UAV) further validate the technology's potential, suggesting
that bladeless fan integration could be transformative not only in commercial settings
but also in the aerospace industry, leading to substantial improvements in overall
system efficiencies.
