Dynamic Pressure Measurement Characteristics in a Model Gas Turbine Combustor and Development of Correction Formula

2020 ◽  
Vol 44 (6) ◽  
pp. 397-406
Author(s):  
Dae Jin Jang ◽  
Byung Chul Jun ◽  
Jong Wun Choi ◽  
Min Chul Lee
Keyword(s):  
Gas Turbine ◽  
Pressure Measurement ◽  
Dynamic Pressure ◽  
Gas Turbine Combustor ◽  
Correction Formula ◽  
Dynamic Pressure Measurement ◽  
Model Gas Turbine Combustor

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.

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.

scholarly journals The Effect of Discrete Pilot Hydrogen Dopant Injection on the Lean Blowout Performance of a Model Gas Turbine Combustor

1999 ◽  
Author(s):  
Oanh Nguyen ◽  
Scott Samuelsen
Keyword(s):  
Gas Turbine ◽  
Atmospheric Pressure ◽  
Gas Turbines ◽  
Nox Emissions ◽  
Gas Turbine Combustor ◽  
Lean Blowout ◽  
Lean Combustion ◽  
Attractive Option ◽  
Overall Performance ◽  
Model Gas Turbine Combustor

In view of increasingly stringent NOx emissions regulations on stationary gas turbines, lean combustion offers an attractive option to reduce reaction temperatures and thereby decrease NOx production. Under lean operation, however, the reaction is vulnerable to blowout. It is herein postulated that pilot hydrogen dopant injection, discretely located, can enhance the lean blowout performance without sacrificing overall performance. The present study addresses this hypothesis in a research combustor assembly, operated at atmospheric pressure, and fired on natural gas using rapid mixing injection, typical of commercial units. Five hydrogen injector scenarios are investigated. The results show that (1) pilot hydrogen dopant injection, discretely located, leads to improved lean blowout performance and (2) the location of discrete injection has a significant impact on the effectiveness of the doping strategy.

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