Computational Study of Noise Reduction in CFM56-5B Using Core Nozzle Chevrons

Arshad, Ali; Andrew, Naveen; Blumbergs, Ilmars

doi:10.1109/icmae50897.2020.9178891

Cited by 15 publications

(5 citation statements)

References 14 publications

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“…is the corrosion potential difference between the substrate and applied coating, and is the anodic Tafel constant of substrate [33]. (4) where a small potential scan is defined with respect to the corrosion potential shown in Eq. (5) [32]:…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The mechanical degradation of stainless steel components causes the considerable attention during application under the industrial [1], electronics [2] marine, automotive and aerospace [3], [4] conditions for the certain period of exposure to mechanical, chemical, and electrochemical impacts. Ballast water stability and maneuverability are required to ensure the buoyancy of ships.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion and Electrochemical Impedance Spectroscopy of Thin TiALN and TiCN PVD Coatings for Protection of Ballast Water Screen Filters

Kalnina

Priednieks

Lukins

et al. 2021

Latvian Journal of Physics and Technical Sciences

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The electrochemical impedance spectroscopy (EIS) and corrosion behaviour of physical vapour deposited (PVD) TiAlN and TiCN coatings of 50 µm mesh shaped AISI 316 stainless steel were estimated under simulated marine conditions (3.5 wt. % NaCl solution). The coatings were prepared by creating adhesive Cr-CrN interlayer with the thickness of about 0.3 µm. The obtained thicknesses of produced coatings were measured to be in a range between 2 and 3.5 µm. The presence of protective coatings leads to corrosion potential (Ecorr ) shifting to more positive values as compared to the bare stainless steel. This effect indicates higher protection efficiency of coated steel under marine conditions. The protective behaviour of produced coating leads to the decreased corrosion current density (jcorr ) by indicating up to 40-fold higher polarization resistance as compared to resistance of the naturally formed oxide layer over the stainless steel. The Nyquist and Bode plots were obtained with the help of EIS measurements by applying alternating potential amplitude of 10 mV on observed Ecorr . The obtained plots were fitted by appropriate equivalent circuits to calculate pore resistance, charge transfer resistance and capacitance. The present study reveals that pore resistance was the highest in the case of TiCN coating (Rpore =3.22 kΩ·cm2). The increase in duration of the immersion up to 24 h leads to change in the capacitive behaviour of the coatings caused by the penetration of the aqueous solution into pore system of TiCN coating with low wettability and surface passivation of reactive TiAlN coating. The presence of defects was confirmed by examining the obtained samples with the help of the scanning electron microscope.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Corrosion and Electrochemical Impedance Spectroscopy of Thin TiALN and TiCN PVD Coatings for Protection of Ballast Water Screen Filters

Kalnina

Priednieks

Lukins

et al. 2021

Latvian Journal of Physics and Technical Sciences

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“…Its large fan provides additional thrust by bypassing some of the air around the combustion chamber, improving fuel efficiency and reducing noise levels. The engine is more complex in design compared to turbojet engines, consisting of a fan, compressor, combustion chamber, turbine, and bypass duct [5]. It can achieve high speeds while maintaining fuel efficiency, making it an ideal choice for commercial aircraft like the Airbus A320.…”

Section: The Turbofanmentioning

confidence: 99%

The performances and applications of gas turbines in the aviation industry

2023

ACE

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This paper focuses on using gas turbines in various industries, particularly aviation, due to their unique power-to-weight ratio. It provides a detailed description of how gas turbines operate based on the thermodynamic Brayton cycle, which includes compressors, combustors, and power turbines. Additionally, the paper analyses both ideal and realistic cycles of gas turbines. Despite numerous advantages, gas turbines have limitations, such as high fuel consumption. However, technological advancements have led to the development of more efficient and quieter gas turbines. The paper explains the classification of jet engines, including turbojets, turboprops, and turbofans, each with specific applications. Moreover, the paper discusses the efforts to reduce the use of fossil fuels in aviation due to the increasing awareness of the impact of climate change. Scientists and engineers are exploring substitute fuels and materials and developing gas turbine systems that maximize work generated with minimal combustion; thus, this paper also highlights the importance of developing more efficient and environmentally friendly gas turbines to reduce the industry's carbon footprint while maintaining their productivity.

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“…This modification is known as compact or condensed spinning. Many developments are under progress in this field by various machinery manufacturers, applying any one of the principles like pneumatic compacting or magnetic compacting [2].…”

Section: Introductionmentioning

confidence: 99%

Design and Geometrical Optimization of Nozzle to Reduce Noise for Jet Engine

Bezuayehu¹,

Kuppusamy²,

Abdulwase³

2022

ECS Trans.

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A scientific payload is used for deep space observations. It consists of several components, which are used to observe and detect the objects and its details. Such payloads are used to collect data for tin-filer research and understanding about the universe and to know its hidden mysteries. This research is conducted using several observatory instruments like, X-ray spectroscope, hyper spectral image camera, laser ranging instruments, etc. In this project. a mechanical configuration of X-ray spectroscope is designed considering all the design parameters and constraints. Boeing recently tested a scaled variable area jet nozzle capable of a 20% area change Shape Memory Alloy actuators were used to position 12 interlocking panels at the nozzle exit. A closed loop control system was used to maintain a range of constant diameters with varying flow conditions and to vary the diameter under constant flow conditions. Acoustic data by sideline microphones and flow field measurements at several cross-sections using PIV was collected at each condition. In this paper the variable area nozzle's design is described. The effect of the nozzle's diameter on acoustic performance is presented flow field data is shown including the effects of the joints between the interlocking panels.

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Computational Study of Noise Reduction in CFM56-5B Using Core Nozzle Chevrons

Cited by 15 publications

References 14 publications

Corrosion and Electrochemical Impedance Spectroscopy of Thin TiALN and TiCN PVD Coatings for Protection of Ballast Water Screen Filters

Corrosion and Electrochemical Impedance Spectroscopy of Thin TiALN and TiCN PVD Coatings for Protection of Ballast Water Screen Filters

The performances and applications of gas turbines in the aviation industry

Design and Geometrical Optimization of Nozzle to Reduce Noise for Jet Engine

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