Results 21 to 30 of about 10,676 (308)

Numerical study of the effect of the corrugated baffle on the acoustic characteristics of the combustion chamber

Acta Acustica, 2022
Combustion instability caused by the amplification of sound waves is called acoustic or high-frequency instability, which can cause severe damage to the system. Adding baffles is one of the methods of passive instability control.
Salarvand Hamid, Shateri Ali Reza, Nadooshan Afshin Ahmadi, Karimipour Iman   +3 more
doaj   +1 more source

Large-Eddy Simulation of combustion instabilities in a variable-length combustor. [PDF]

, 2013
This article presents a simulation of a model rocket combustor with continuously variable acoustic properties thanks to a variable-length injector tube. Fully compressible Large-Eddy Simulations are conducted using the AVBP code.
Garby, Romain, Laurent Selle, Thierry Poinsot, Romain Garby, Selle, Laurent, Poinsot, Thierry   +5 more
core   +1 more source

Effect of the Air Flow on the Combustion Process and Preheating Effect of the Intake Manifold Burner

Energies, 2022
Diesel engines show poor performance and high emissions under cold-start conditions. The intake manifold burner is an effective method to increase the intake air temperature and improve engine performance.
Zhishuang Li, Ziman Wang, Haoyang Mo, Han Wu   +3 more
doaj   +1 more source

Numerical Simulation Study on the Dynamics of Bluff-Body Flames under Oxygen-Lean Conditions

Energies, 2023
As modern aeroengine combustors advance towards high temperatures, afterburners are inevitably affected by diminished oxygen content in incoming flows, thus affecting combustion efficiency, instability, and flammability limits. In this study, the dynamic
Fuquan Deng, Minwei Zhao, Shunchuang Qin, Zhaokun Wang, Yongliang Xie, Hongtao Zheng, Xiao Liu, Feng Zhang   +7 more
doaj   +1 more source

Linear Instability Analysis of Lean Premixed Combustion

Journal of Thermal Science and Technology, 2012
Combustion oscillation of a self excited combustion-acoustic phenomenon occurs inside the gas turbine combustor. In general, excessive pressure fluctuation of combustion oscillation may impair the gas turbine engine operation and may result in hardware ...
Kazufumi IKEDA, Keisuke MATSUYAMA, Mitsunori ISONO, Masaharu NISHIMURA   +3 more
doaj   +1 more source

Thermoacoustic Instabilities in the Rijke Tube: Experiments and Modeling [PDF]

, 2003
Thermoacoustic instability can appear in thermal devices when unsteady heat release is coupled with pressure perturbations. This effect results in excitation of eigen acoustic modes of the system.
Konstantin Matveev, Matveev, Konstantin Ivanovich   +1 more
core   +1 more source

Experiment investigation of the effects of hydrogen content on the combustion instability of methane/hydrogen lean premixed swirl flames under different acoustic frequency ranges

AIP Advances, 2019
Experimental study on combustion instability of lean premixed swirl flame was conducted for methane-hydrogen mixtures, and the influence mechanism of hydrogen content (0%, 10%, 20%, and 40%) on the combustion instability under different acoustic ...
Mingxiao Wang, Yingjie Zhong, Kai Deng
doaj   +1 more source

Using LES to Study Reacting Flows and Instabilities in Annular Combustion Chambers [PDF]

, 2011
Great prominence is put on the design of aeronautical gas turbines due to increasingly stringent regulations and the need to tackle rising fuel prices.
Pierre Wolf, Wolf, Pierre, Staffelbach, Gabriel, Thierry Poinsot, Ramesh Balakrishnan, Balakrishnan, Ramesh, Gabriel Staffelbach, Gicquel, Laurent Y.M., Laurent Y. M. Gicquel, Poinsot, Thierry   +9 more
core   +1 more source

Analysis of Combustion Instability for a Natural Gas Engine with Lean-burn Conditions [PDF]

Zhengzhou Daxue xuebao. Gongxue ban
To study the variation law of combustion instability of natural gas engine with lean-burn condition,experiments were carried out on a natural gas engine with six different excess air coefficients with the condition of25% load and 1 000 r / min.
DING Shunliang, GENG Haitang, GAO Jianshe, TAO Zheng, SONG Enzhe   +4 more
doaj   +1 more source

Large Eddy Simulations of gaseous flames in gas turbine combustion chambers [PDF]

, 2012
Recent developments in numerical schemes, turbulent combustion models and the regular increase of computing power allow Large Eddy Simulation (LES) to be applied to real industrial burners.
Staffelbach, Gabriel, Gicquel, Laurent Y.M., Poinsot, Thierry   +2 more
core   +1 more source