Results 21 to 30 of about 255 (174)
Metamaterial‐Augmented Head‐Mounted Audio Module
Advanced Materials Technologies, Volume 8, Issue 19, October 10, 2023., 2023 A metamaterial‐transducer resonant coupling is proposed inside a head‐mounted audio module to achieve a 3–7 dB broadband sound pressure level improvement within 50–700 Hz, which is the most challenging frequency range for radiation enhancement. The acoustic metamaterial not only enhances voltage sensitivity near the intrinsic metamaterial resonance ...
Jun Ji +5 more
wiley +1 more source
Journal of Aerospace Technology and Management, 2019 Thermoacoustic instability in liquid rocket engines can have potentially catastrophic consequences. Active control based on feedback promises improved stability margin over a wider range of operating conditions than passive control.
Varghese M Thannickal +2 more
doaj +3 more sources
Energies, 2023 Hydrogen can play a key role in the gradual transition towards a full decarbonization of the combustion sector, e.g., in power generation. Despite the advantages related to the use of this carbon-free fuel, there are still several challenging technical ...
Vito Ceglie +4 more
doaj +1 more source
International Journal for Numerical Methods in Fluids, Volume 94, Issue 8, Page 1082-1110, August 2022., 2022 Vorticity contours in a three‐dimensional bluff‐body combustor. Abstract The objective of this study is to develop and apply efficient solution techniques for numerical modeling of combustion with stiff chemical kinetics in practical combustors. The new technique combines a fourth‐order implicit‐explicit (IMEX) additive Runge‐Kutta scheme (ARK) with ...
Joshua Christopher +2 more
wiley +1 more source
Advanced Control for Applications, Volume 4, Issue 2, June 2022., 2022 Abstract Predictive functional control (PFC) is a straightforward and cheap model‐based technique for systematic control of well‐damped open‐loop processes. Nevertheless, its oversimplified design characteristics are often the cause of diminished efficacy in more challenging applications; processes involving lightly damped and/or unstable dynamics have
Muhammad Saleheen Aftab +1 more
wiley +1 more source
Experiments and identification of thermoacoustic instabilities with the Rijke tube [PDF]
2020 IEEE Conference on Control Technology and Applications (CCTA), 2020 ISBN:978-1-7281-7141 ...
Andrea Iannelli +3 more
openaire +2 more sources
Energy Science &Engineering, Volume 9, Issue 10, Page 1872-1886, October 2021., 2021 This work introduces a method to detect and optimize the flame front boundary. A high‐speed camera was employed to continuously capture the flame images. By setting appropriate intensity thresholds, the impact noise can be eliminated from the image and the flame front boundary can be determined.
Lanzhou Gao +6 more
wiley +1 more source
Complexity, Volume 2021, Issue 1, 2021., 2021 The complex bursting oscillation and bifurcation mechanisms in coupling systems of different scales have been a hot spot domestically and overseas. In this paper, we analyze the bursting oscillation of a generalized Duffing–Van der Pol system with periodic excitation.
Youhua Qian +3 more
wiley +1 more source
On the mechanism by which nose bluntness suppresses second-mode instability
Theoretical and Applied Mechanics Letters, 2020 : A physical mechanism by which nose bluntness suppresses second-mode instability is proposed. Considered are 7 degree half-angle straight cones with nose bluntness radii of 0.15 mm, 3.556 mm, 5 mm, 9.525 mm, 12.7 mm and 25.4 mm at tunnel conditions ...
Armani Batista +2 more
doaj +1 more source
Acoustic Triggering of Combustion Instability in a Swirling Flame: An Experimental Study
Energies, 2023 Combustion instability is a common thermoacoustic coupling problem in combustion systems, and the pressure oscillations generated inevitably damage the combustion system. Studying the mechanism of combustion instability, especially the triggering problem
Yunpeng Liu +3 more
doaj +1 more source