Abstract
Indirect combustion noise had not been attracting research in the past, but recent indication seems to prove that it could be a threat in the future if not addressed. Means of reducing this type of noise to a low decibel value was also included. Noise is due to the ingestion of distorted atmospheric turbulence, as the two set of blades rotate in different direction. Open rotor noise is higher since the rotors are fully exposed to oncoming turbulence and lack ducting or a nacelle to attenuate the radiated sound. A thorough review on the technology that can replace conventional turbofan was carried out. It was found that none of this technology can meet up with the ACARE and NASA 2020 vision but left a gap to be filled. Because open rotor is the most proven engine that is able to satisfy this requirements, different methods are adopted and integrated to reduce open rotor noise. Attention was paid to the geometry of the blade, hub and blade length, the vorticity and interaction noise are simulated until an optimized blade was achieved. The integration problem of open rotor was addressed where the engine was located to minimize perceive noise to the payload.
Highlights
Aerospace engineering is an aspect of engineering that deals with the design, maintenance and improvement of aircraft by using knowledge and skills acquired through mathematics, physics, chemistry and natural science
Aircraft design requires the integration of experts in disciplines including Aerodynamics, Propulsion, Structures, Flight mechanics, Avionics and Management (Sadraey, 2013)
The objectives of the research were validated as the optimized rotor blades shows greater reduction in noise, this is evaluated to be 18dB, while clipping of aft blades by 25% reduces the noise by 7dB, active noise control presents a gap that requires further research this is to reduce combustion noise but it does appear that this method could reduce noise by more than 5dB
Summary
Aerospace engineering is an aspect of engineering that deals with the design, maintenance and improvement of aircraft by using knowledge and skills acquired through mathematics, physics, chemistry and natural science. The major activity in aeronautical profession is aircraft design. Aircraft design requires the integration of experts in disciplines including Aerodynamics, Propulsion, Structures, Flight mechanics, Avionics and Management (Sadraey, 2013). All experts in these fields must have the basic knowledge of engineering design techniques. The career goal of any aerospace engineer like other engineers in differ fields is to design aircraft that satisfactorily meets the market demand (Bello, 2018)
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