TY - GEN
T1 - Numerical simulation of passive control to self-excited thermoacoustic instabilities in a rijke tube
AU - Ji, Chenzhen
AU - Zhao, Dan
AU - Li, Shihuai
AU - Li, Xinyan
N1 - Publisher Copyright:
Copyright © (2014) by the International Institute of Acoustics & Vibration All rights reserved.
PY - 2014
Y1 - 2014
N2 - Thermoacoustic instabilities can be triggered at a certain condition in a Rijke tube type of combustor. To suppress it, the present work considers a passive control element for the system, placing a second heat element at the opposite side of the original one. In order to gain insight on the damping mechanism and evaluate the second heat element effecting on the combustion instabilities, a two dimensional numerical study has been conducted in time domain. The simulation is modelled by using finite volume method to solve the unsteady Navier-Stokes equations. It is found from the results that the passive control element can affect the ther- moaoustic instabilities significantly. With the control element, the pressure oscillation used to characterize the instabilities cannot keep steady in the original limit cycle and obviously decays to another a smaller one. The frequency of oscillation is also changed, which means the initial thermoacoustic instability system is decrease to a new one with smaller oscillations. Further study indicates that the input of second heating element's temperature determines the outcome of thermoacoustic instabilities decaying. The successful application of second heat element in a Rijke tube provides new possibilities for the passive control of thermoacoustic instabilities to reduce or remove the oscillations.
AB - Thermoacoustic instabilities can be triggered at a certain condition in a Rijke tube type of combustor. To suppress it, the present work considers a passive control element for the system, placing a second heat element at the opposite side of the original one. In order to gain insight on the damping mechanism and evaluate the second heat element effecting on the combustion instabilities, a two dimensional numerical study has been conducted in time domain. The simulation is modelled by using finite volume method to solve the unsteady Navier-Stokes equations. It is found from the results that the passive control element can affect the ther- moaoustic instabilities significantly. With the control element, the pressure oscillation used to characterize the instabilities cannot keep steady in the original limit cycle and obviously decays to another a smaller one. The frequency of oscillation is also changed, which means the initial thermoacoustic instability system is decrease to a new one with smaller oscillations. Further study indicates that the input of second heating element's temperature determines the outcome of thermoacoustic instabilities decaying. The successful application of second heat element in a Rijke tube provides new possibilities for the passive control of thermoacoustic instabilities to reduce or remove the oscillations.
UR - http://www.scopus.com/inward/record.url?scp=84922654946&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84922654946
T3 - 21st International Congress on Sound and Vibration 2014, ICSV 2014
SP - 3070
EP - 3077
BT - 21st International Congress on Sound and Vibration 2014, ICSV 2014
PB - International Institute of Acoustics and Vibrations
T2 - 21st International Congress on Sound and Vibration 2014, ICSV 2014
Y2 - 13 July 2014 through 17 July 2014
ER -