Thermoacoustic Coupling in a Multinozzle Staged Combustor

2016 ◽  
Vol 32 (4) ◽  
pp. 856-868 ◽  
Author(s):  
Brian Dolan ◽  
Rodrigo Villalva Gomez ◽  
David Munday ◽  
Spencer Pack ◽  
Ephraim Gutmark
Keyword(s):  
Thermoacoustic Coupling

Methodology for assessing the uncertainty of measurements of mechanical stresses by the ultrasonic method with the help of an optical-acoustic separate-combined transducer

2021 ◽  
Vol 2127 (1) ◽  
pp. 012036
Author(s):  
A V Fedorov ◽  
V A Bychenok ◽  
I V Berkutov ◽  
I E Alifanova ◽  
A E Khoshev
Keyword(s):  
Ultrasonic Wave ◽  
Propagation Velocity ◽  
Ultrasonic Method ◽  
Mechanical Stresses ◽  
Acoustic Transducer ◽  
Head Waves ◽  
Uncertainty Of Measurements ◽  
Coupling Parameters ◽  
Object Of Control ◽  
Thermoacoustic Coupling

Abstract The work is devoted to the ultrasonic method of controlling mechanical stresses using ultrasonic head waves. The factors that contribute to the result of measurements of mechanical stresses include: the propagation velocity of the head ultrasonic wave, the temperature of the environment and the object of control, the coefficients of acoustoelastic and thermoacoustic coupling, parameters of the optical-acoustic transducer. The contribution of each of these factors to the results of measurements of mechanical stresses is assessed. A technique for assessing the uncertainty of measurements of mechanical stresses by the ultrasonic method using head waves has been developed.

scholarly journals A novel method for the identification of flame front’s position on thermoacoustic coupling combustion oscillations

2021 ◽  
Vol 9 (10) ◽  
pp. 1872-1886
Author(s):  
Lanzhou Gao ◽  
Shini Peng ◽  
Xiaomei Huang ◽  
Yinhu Kang ◽  
Shan Su ◽  
...  
Keyword(s):  
Novel Method ◽  
Thermoacoustic Coupling

Interaction Between Precessing Vortex Core and Thermoacoustic Coupling in a Lab-Scale Lean Premixed Gas Turbine Combustor: Numerical Simulation Studies

2017 ◽  
Author(s):  
Zhenlin Wang ◽  
Xiangsheng Li ◽  
Zhenping Feng
Keyword(s):  
Vortex Core ◽  
Large Scale ◽  
Pressure Oscillation ◽  
Underlying Mechanism ◽  
Industrial Applications ◽  
Combustion Instabilities ◽  
Unsteady Combustion ◽  
Precessing Vortex Core ◽  
Initial Stage ◽  
Thermoacoustic Coupling

To evaluate the complex dynamic phenomena occurring during combustion, Large Eddy Simulations of the swirl-stabilized flame of PRECCINSTA burner were carried out. The existence of a precessing vortex core in the initial stage of unsteady combustion was proved, both in the cold flow and initial stage of the combustion. The PVC flow structure finally disappeared and became a flapping toroidal flowfield structure with the increase in the amplitude of pressure oscillation when combustion instabilities occurred. The LES results indicate the interactions between the PVC and thermoacoustic coupling and the underlying mechanism of the phenomenon. This study evaluated the effect of PVC on the thermoacoustic coupling in the initial stage of unsteady combustion and elucidated the mechanism for the disappearance of PVC under large-scale pressure oscillation. This has a great significance in the practical industrial applications of controlling combustion instabilities.

scholarly journals Effect of phase-shift feedback on thermoacoustic coupling

2016 ◽  
Vol 49 (10) ◽  
pp. 65-70
Author(s):  
Beatriz M. Morán ◽  
A. Saurabh ◽  
C.O. Paschereit ◽  
L. Kabiraj
Keyword(s):  
Phase Shift ◽  
Thermoacoustic Coupling

Thermoacoustic coupling of premixed flames in mesoscale diameter tubes

2021 ◽  
Vol 234 ◽  
pp. 111676
Author(s):  
Maria Castela ◽  
Alam Garcidueñas Correa ◽  
Jason S. Damazo ◽  
Deanna A. Lacoste
Keyword(s):  
Premixed Flames ◽  
Thermoacoustic Coupling
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