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Jinrong Bao, Chenzhen Ji, Deng Pan, Chao Zong, Ziyang Zhang and Tong Zhu
The propagation mechanism of flow disturbance under acoustic excitations plays a crucial role in thermoacoustic instability, especially when considering the effect of non-premixed combustion on heat release due to reactant mixing and diffusion. This rela...
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Eytan J. Adler, Benjamin J. Brelje and Joaquim R. R. A. Martins
Electrified aircraft propulsion enables new aircraft designs with fewer emissions. One challenge of electrified architectures is handling the electrical components? waste heat. This is because batteries and other electrical components are sensitive to hi...
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Jiangge Deng, Ting Li, Jinkui Wang and Chicheng Gao
Thermoacoustic instabilities occur when heat release is coupled with pressure fluctuation, which may cause performance degradation of the combustor and serious structural damage. This study focued on an active control method using discharge plasma and sh...
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Jiaqi Nan, Jingxuan Li and Lijun Yang
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 duc...
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Yushan Gao, Bingbing Zhang, Jinbo Cheng, Jingxuan Li and Qingfei Fu
Combustion instability is the biggest threat to the reliability of liquid rocket engines, whose prediction and suppression are of great significance for engineering applications. To predict the stability of a combustion chamber with a hypergolic propella...
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Chenglin Zhou, Jianfeng Zou and Yang Zhang
In order to study the influence of streamwise forcing on the formation mechanism of liquid ligaments and droplets in the primary breakup process of liquid circular jet, the VOF interface capturing method-based direct numerical simulation was adopted, and...
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Jan Martin, Wolfgang Armbruster, Dmitry Suslov, Robert Stützer, Justin S. Hardi and Michael Oschwald
Hot-fire tests were performed with a single-injector research combustor featuring a large optical access (255 × 38 mm) for flame imaging. These tests were conducted with the propellant combination of liquid oxygen and compressed natural gas (LOX/CNG) at ...
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Wonjeong Hyun, Jina Kim, Heesang Chae and Changjin Lee
The occurrence of low-frequency instability (LFI) appears to be related to multiple interactions among many complex physical processes, such as vortex shedding, boundary-layer oscillation, and additional combustion in the post-combustion chamber. In this...
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Yuze Sun, Dan Zhao and Xiaowei Zhu
In the present work, 3D Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations are performed to investigate the generation and mitigation mechanism of combustion-sustained thermoacoustic instabilities in a modelled swirl combustor. The effects of (...
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James Brind and Graham Pullan
We quantify the sensitivity of turbine acoustic impedance to aerodynamic design parameters. Impedance boundary conditions are an influential yet uncertain parameter in predicting the thermoacoustic stability of gas turbine combustors. We extend the semi-...
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