Results 21 to 30 of about 3,374 (244)
loop-shaping control of azimuthal combustion instabilities in annular combustors
Journal of Low Frequency Noise, Vibration and Active Control, 2021 Lean combustion technique and annular geometries are preferred in aero-engines and gas turbines, which however may lead to azimuthal combustion instabilities. Active control can be used to stabilize combustion instabilities.
Sheng Feng, Jingxuan Li
doaj +1 more source
Monitoring Preferential Flow of Water in Sand Using Thermoacoustics Wave Imaging
Geophysical Research Letters, Volume 50, Issue 21, 16 November 2023., 2023 Abstract Accurate predictions of fluid flow, mass transport, and reaction rates critically impact the efficiency and reliability of subsurface exploration and sustainable use of subsurface resources. Quantitative dynamical sensing and imaging can play a pivotal role in the ability to make such predictions.
Chang Liu +6 more
wiley +1 more source
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
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
Effects of liquid fuel/wall interaction on thermoacoustic instabilities in swirling spray flames
Combustion and Flame, 2020 Davide Laera +2 more
exaly +3 more sources
Energies, 2023 Thermoacoustic instabilities in gasturbine combustor systems can be predicted in the design phase with a thermoacoustic network model. In this model, the coupling between acoustic pressure fluctuations and the combustion rate is described by the Flame ...
Mehmet Kapucu, Jim B. W. Kok
doaj +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
Aerospace, 2022 Cylindrical ducts with axial mean temperature gradient and mean flows are typical elements in rocket engines, can combustors, and afterburners. Accurate analytical solutions for the acoustic waves of the longitudinal and transverse modes within these ...
Jiaqi Nan, Jingxuan Li, Lijun Yang
doaj +1 more source
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
Numerical investigation of the premixed V-flame stabilization and blowout [PDF]
مهندسی مکانیک شریف, 2021 Global warming and high fossil fuel consumption increase the application of the low-Nox burner with lean-premixed combustion. However, this type of combustion is more susceptible to thermoacoustic instabilities.
N. Nabatian
doaj +1 more source