| Autor: |
Blondé, Audrey, Schuermans, Bruno, Noiray, Nicolas |
| Předmět: |
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| Zdroj: |
INTER-NOISE & NOISE-CON Congress & Conference Proceedings; 2023, Vol. 265 Issue 3, p592-600, 9p |
| Abstrakt: |
Predicting the existence of thermoacoustic instabilities is a key step in the design of modern gas turbines and the choice of their operating conditions. The stability of a combustion system crucially depends on the acoustic boundary conditions. In order to systematically investigate the influence of these boundary conditions, a test facility with variable inlet and outlet geometry has been developed. Cold flow tests confirmed that the acoustic terminations allow for a change of the reflection coefficient from close to -1 (open end) to 0 (anechoic) to 0.8 (almost close end) over a large frequency range. In the present work, we present the design of an adjustable exit boundary enabling a change in the thermoacoustic stability without modifying the flame operating conditions. Experiments have been conducted in a turbulent axial atmospheric combustor. The acoustic reflection coefficients of the exit boundary are measured for different boundary geometries and the impact of these geometries on the flame stability is assessed. A parametrized model is derived and reproduces the experiments well. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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