Results 61 to 70 of about 1,024 (213)

An Experimental PIV/POD Study on the Sequentially Coupled Flow Field of Swirl and Multiple Jets

International Journal of Aerospace Engineering, Volume 2026, Issue 1, 2026.
The stepwise flow reconstruction induced by sequential coupling of swirl, primary jets, and dilution jets was experimentally investigated in a model combustor using high‐speed PIV and proper orthogonal decomposition (POD). Three nonreacting configurations were compared: pure swirl, swirl plus primary jets, and swirl with both primary and dilution jets.
Qingqing Dong, Jian Chen, Kan Xie
wiley   +1 more source

Inhibiting the onset of thermoacoustic instability through targeted control of critical regions [PDF]

, 2023
This experimental study investigates the dynamical transition from stable operation to thermoacoustic instability in a turbulent bluff-body stabilised dump combustor.
Unni, Vishnu R
core   +1 more source

On the mechanism of open-loop control of thermoacoustic instability in a laminar premixed combustor [PDF]

, 2020
We identify mechanisms through which open-loop control of thermoacoustic instability is achieved in a laminar combustor and characterize them using synchronization theory.
Roy, Amitesh, Mondal, Sirshendu, Pawar, Samadhan A., Sujith, R. I.   +3 more
core   +1 more source

Detached Eddy Simulation (DES) of a Turbulent Premixed Flame Stabilized on a Bluff Body

Proceedings in Applied Mathematics and Mechanics, Volume 25, Issue 2, June 2025.
ABSTRACT As the demand for net‐zero emissions intensifies, low‐emission fuels (LEFs) are increasingly explored for their potential to reduce pollutants in combustion systems. The present study investigates the flame dynamics and pollutant emissions (CO and NOx) of different LEFs using detached eddy simulations (DES), a method that offers better ...
Abdelkader Hemaizia, Dominique Thévenin, Cheng Chi   +2 more
wiley   +1 more source

A Review on Combustion Instability of Hydrogen-Enriched Marine Gas Turbines

Journal of Marine Science and Engineering
Hydrogen is widely regarded as a promising carbon-free alternative fuel. However, the development of low-emission marine gas turbine combustion systems has been hindered by the associated risks of combustion instability, also termed as thermoacoustic ...
Jiaying Cheng, Bin Hu, Zhilin Zeng, Jinhai Fu, Boyang Zhang   +4 more
doaj   +1 more source

Study of burner geometry effects on non-premixed flame response under acoustic excitation

Journal of Low Frequency Noise, Vibration and Active Control, 2019
The study of the flame under the acoustic excitation contributes to the study of flame self-excited thermoacoustic instability. Although non-premixed combustion is widely used in industry, research on its combustion instability characteristics is ...
Hao Zhou, Sheng Meng, Chengfei Tao, Zihua Liu   +3 more
doaj   +1 more source

Adaptive Vibration Control of the Moving Cage in the 4 ×$\times$ 4 Hyperbolic PDE‐ODE Model of the Dual‐Cable Mining Elevator

IET Control Theory &Applications, Volume 19, Issue 1, January/December 2025.
This paper proposes an observer‐based adaptive output‐feedback boundary control to stabilize the vibrations of the moving cage of a dual‐cable mining elevator. This system is comprised of two mechanically jointed winding drums that drive the two cables through the floating sheaves to lift the cage.
Elham Aarabi, Mohammadali Ghadiri‐Modarres, Mohsen Mojiri   +2 more
wiley   +1 more source

On the emergence of critical regions at the onset of thermoacoustic instability in a turbulent combustor [PDF]

, 2018
We use complex network theory to investigate the dynamical transition from stable operation to thermoacoustic instability via intermittency in a turbulent combustor with a bluff body stabilized flame.
George, Nitin B., R. Manikandan, Marwan, Norbert, Jürgen Kurths, Unni, Vishnu R., Manikandan, R., Norbert Marwan, Kurths, Jürgen, Vishnu R. Unni, Abin Krishnan, Krishnan, Abin, Nitin B. George, R. I. Sujith, Sujith, R. I.   +13 more
core   +1 more source

Coupled interaction between acoustics and unsteady flame dynamics during the transition to thermoacoustic instability in a multi-element rocket combustor [PDF]

, 2021
Rocket engine combustors are prone to transverse instabilities that are characterized by large amplitude high frequency oscillations in the acoustic pressure and the heat release rate.
Kasthuri, Praveen, Gejji, Rohan, Anderson, William, Pawar, Samadhan A., Sujith, R. I.   +4 more
core   +2 more sources

Simultaneous 10 kHz PIV/OH-PLIF/chemiluminescence and conjoint data analysis approach for thermoacoustic oscillation near lean blowout

Applications in Energy and Combustion Science
Simultaneous multi-parameter experimental data characterizing the flow-combustion interaction process are of great significance for understanding the flame instability mechanism in combustion systems.
Zhen Cao, Wenbei Liu, Xin Yu, Bin Hu, Jiangbo Peng, PengHua Qiu, Chaobo Yang   +6 more
doaj   +1 more source