On the observation of high-order, multi-mode, thermo-acoustic combustion instability in a model gas turbine combustor firing hydrogen containing syngases

2019 ◽  
Vol 44 (21) ◽  
pp. 11111-11120 ◽  
Author(s):  
Young Jin Kim ◽  
Youngbin Yoon ◽  
Min Chul Lee
Keyword(s):  
Gas Turbine ◽  
Combustion Instability ◽  
High Order ◽  
Gas Turbine Combustor ◽  
Model Gas Turbine Combustor ◽  
Multi Mode

The Effect of Fuel Composition on Combustion Instability Mode Occurrence in a Model Gas Turbine Combustor

2015 ◽  
Author(s):  
Jisu Yoon ◽  
Seongpil Joo ◽  
Min Chul Lee ◽  
Jeongjin Kim ◽  
Jaeyo Oh ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Alternative Fuels ◽  
Combustion Instability ◽  
Longitudinal Mode ◽  
Fuel Composition ◽  
Instability Mode ◽  
Gas Turbine Combustor ◽  
Global Issues ◽  
Model Gas Turbine Combustor ◽  
Instability Frequency

Recently, energy resource depletion and unstable energy prices have become global issues. Worldwide pressure to secure and make more gas and oil available to support global power needs has increased. To meet these needs, alternative fuels composed of various types of fuels have received attention, including biomass, dimethyl ether (DME), and low rank coal. For this reason, the fuel flexibility of the combustion system becomes more important. In this study, H2 and CH4 were selected as the main fuel composition variables and the OH-chemiluminescence measurement technique was also applied. This experimental study was conducted under equivalence ratio and fuel composition variations with a model gas turbine combustor to examine the relation between combustion instability and fuel composition. The combustion instability peak occurs in the H2/CH4 50:50 composed fuel and the combustion instability frequency shifted to higher harmonic of longitudinal mode based on the H2 concentration of the fuel. Based on instability mode and flame length calculation, the effect of the convection time during the instability frequency increasing phenomenon was found in a partially premixed gas turbine combustor. The time-lag analysis showed that the short convection time in a high H2 concentration fuel affects the feedback loop period reduction and, in these conditions, high harmonics of longitudinal mode instability occurs. This fundamental study on combustion instability frequency shifting characteristics was conducted for H2/CH4 composed fuel and the results contribute key information for the conceptual design of a fuel flexible gas turbine and its optimum operation conditions.

scholarly journals A novel diagnostic method based on filter bank theory for fast and accurate detection of thermoacoustic instability

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Seongpil Joo ◽  
Jongwun Choi ◽  
Namkeun Kim ◽  
Min Chul Lee
Keyword(s):  
Gas Turbine ◽  
Filter Bank ◽  
Dynamic Pressure ◽  
Single Mode ◽  
Instability Criterion ◽  
Gas Turbine Combustor ◽  
Thermoacoustic Instability ◽  
Comparable Performance ◽  
Model Gas Turbine Combustor ◽  
Multi Mode

AbstractThis study proposes and analyzes a novel methodology that can effectively detect multi-mode combustion instability (CI) in a gas turbine combustor. The experiment is conducted in a model gas turbine combustor, and dynamic pressure (DP) and flame images are examined during the transition from stable to unstable flame, which is driven by changing fuel compositions. As a powerful technique for early detection of CI in multi-mode as well as in single mode, a new filter bank (FB) method based on spectral analysis of DP is proposed. Sequential processing using a triangular filter with Mel-scaling and a Hamming window is applied to increase the accuracy of the FB method, and the instability criterion is determined by calculating the magnitude of FB components. The performance of the FB method is compared with that of two conventional methods that are based on the root-mean-squared DP and temporal kurtosis. From the results, the FB method shows comparable performance in detection speed, sensitivity, and accuracy with other parameters. In addition, the FB components enable the analysis of various frequencies and multi-mode frequencies. Therefore, the FB method can be considered as an additional prognosis tool to determine the multi-mode CI in a monitoring system for gas turbine combustors.

Effect of fuel–air mixture velocity on combustion instability of a model gas turbine combustor

2013 ◽  
Vol 54 (1) ◽  
pp. 92-101 ◽  
Author(s):  
Jisu Yoon ◽  
Min-Ki Kim ◽  
Jeongjae Hwang ◽  
Jongguen Lee ◽  
Youngbin Yoon
Keyword(s):  
Gas Turbine ◽  
Combustion Instability ◽  
Gas Turbine Combustor ◽  
Model Gas Turbine Combustor ◽  
Mixture Velocity

scholarly journals Active Control Application to a Model Gas Turbine Combustor

1990 ◽  
Author(s):  
J. Brouwer ◽  
B. A. Ault ◽  
J. E. Bobrow ◽  
G. S. Samuelsen
Keyword(s):  
Feedback Control ◽  
Gas Turbine ◽  
Active Control ◽  
Input Parameter ◽  
Radiative Flux ◽  
Gas Turbine Combustor ◽  
Control Computer ◽  
Loop Feedback ◽  
Model Gas Turbine Combustor ◽  
Control Application

Closed-loop feedback control, developed in a axisymmetric can combustor, is demonstrated in a model can combustor with discrete wall jets. The study represents the initial steps toward the application of feedback control technology to practical gas turbine combustion systems. For the present application, the radiative flux from soot particulate is used as an indication of combustor performance, and nozzle atomizing air is selected as the input parameter. A measurement of radiative flux at the exit plane of the combustor is conveyed to a control computer which invokes an optimization algorithm to determine changes in the dome region necessary to minimize the radiative flux from soot. The results demonstrate the utility and potential of active control for maintaining optimal performance in real-time.

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