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- Title
In-situ measurement of reflection coefficient and its application to predicting combustion instability in a gas turbine combustor.
- Authors
Song, Won Joon; Youn, Gyu Seong; Cha, Dong Jin
- Abstract
Here, a procedure that uses in-situ data recorded by two microphones placed inside an operating gas turbine combustor to determine the reflection coefficient is proposed. The procedure is validated against previously reported results and further employed to determine the coefficients of feeding lines supplying a partially premixed gas turbine combustor. With the help of lumped network code, a prediction analysis of combustion instability in a combustor is also conducted using the measured reflection coefficients, R(ω), which are a function of frequency. The prediction results are compared with those from other acoustic boundaries, including both analytical models and a measured single-valued approach. The predictions, based on R(ω), are shown to be more accurate than those from any other boundary methods considered. A comparison of the predicted combustion instability frequencies from this study with corresponding experimental results shows that the developed procedure for determining the coefficient is reliable and has great potential.
- Subjects
GAS turbine combustion; REFLECTANCE; GAS turbines; LINEAR network coding; DATA recorders &; recording
- Publication
Journal of Mechanical Science & Technology, 2021, Vol 35, Issue 9, p4261
- ISSN
1738-494X
- Publication type
Article
- DOI
10.1007/s12206-021-0836-1