cfd analysis of acoustic damping on Helmholtz resonators inside rockets combustion chambers.
- Paper number
IAC-20,C2,IP,1,x58710
- Author
Mr. César Augusto Páez Betancourt, Mexico, Insituto de Ingenieria UNAM
- Coauthor
Mrs. Alejandra Michelle Peñaloza Flores, Mexico, Tecnológico de Estudios Superiores de Ecatepec
- Year
2020
- Abstract
Acoustic instabilities can affect performance or even destroy combustion chambers, if their frequency of resonance matches the frequency of the sound produced due to combustion processes. This paper focuses on studying attenuation of acoustic instabilities inside rockets combustion chambers. This was done by obtaining, via a 2D-CFD solver written in Matlab code, the acoustic impedance behavior in a Helmholtz resonator with a sudden-reduction geometry. The objective is to qualitatively compare the behavior of the simulated geometry with the response of another two geometries: chamfered and rounded. Simulations were carried out under a low range of acoustic excitations, from 5 [Hz] up to 20 [Hz], and for Reynolds numbers up to 20. This comparison is of great importance, as it is pursued to reduce, as much as possible, these instabilities by implementing the correct resonator geometry for rockets combustion chambers. According to the qualitative results obtained from the analysis, it was shown that the geometry simulated in this work (sudden reduction) yielded the best damping acoustic performance. For further investigation, it would be ideal to compare the performance of three geometries under both a larger frequency spectrum and greater Reynolds numbers.
- Abstract document
- Manuscript document
(absent)