premixed combustion
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Fuel ◽  
2022 ◽  
Vol 313 ◽  
pp. 123015
Author(s):  
Siqi Cai ◽  
Wenquan Yang ◽  
Yan Ding ◽  
Qinghua Zeng ◽  
Jianlong Wan
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2021 ◽  
Vol 15 (5) ◽  
Author(s):  
Vittorio Ravaglioli ◽  
Fabrizio Ponti ◽  
Giacomo Silvagni ◽  
Davide Moro ◽  
Federico Stola ◽  
...  

Author(s):  
Yipin Lu ◽  
Yinli Xiao ◽  
Juan Wu ◽  
Liang Chen

Lean premixed combustion is a common form of combustion organization in power equipment and propulsion systems. In order to understand the dynamic characteristics of lean premixed flame and predict and control its combustion instability, it is necessary to obtain its flame describing function (FDF). Based on the open source CFD toolbox, OpenFOAM, the dynamic K-equation model, and the finite rate Partially Stirred Reactor (PaSR) model were used to perform large eddy simulations (LES) of lean premixed combustion, and the response of the unsteady heat release rate to single-frequency harmonic disturbances was studied. The response of the unsteady heat release rate was characterized by the FDF, and the response of the unsteady heat release rate to the two-frequency harmonic disturbance was studied. The results show that the quantitative heat release rate response and flame dynamics have very proper accuracy. In the single-frequency harmonic disturbance, as the forcing frequency increases, the curling behavior of the flame surface and the instantaneous vortex structure change; the nonlinear kinematics effect is manifested by the entrainment of the vortex. At lower forcing frequencies, the heat release response changes linearly with the increase of forcing amplitude; at intermediate frequencies, the heat release response exhibits obvious nonlinear behavior; at high frequencies, the heat release response to amplitude changes decreases. The introduction of the second harmonic disturbance will significantly reduce the response range of the total heat release rate and make the combustion more stable.


Fuel ◽  
2021 ◽  
Vol 306 ◽  
pp. 121660
Author(s):  
Zhe Wang ◽  
Changwei Ji ◽  
Du Wang ◽  
Ruifeng Hou ◽  
Tianyue Zhang ◽  
...  

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