Volume 2, 2011Progress in Propulsion Physics
|Page(s)||339 - 350|
|Section||Liquid Rocket Propulsion|
|Published online||01 October 2012|
On the acoustics of rocket combustors equipped with quarter wave absorbers
DLR Lampoldshausen Langer Grund D 74239 Hardthausen, Deutschland
The acoustic resonance spectrum and the dissipation of specific modes in combustors equipped with absorbers have been investigated experimentally and numerically. It is found that the application of absorber rings to a combustor changes its resonance behavior significantly. Based on the acoustic fields obtained by three-dimensional (3D) modal analysis, the damping behavior for modes is predicted and compared to measurements. There is a good agreement between prediction and experimental data with respect to the general trend of the dependence of damping on the absorber length. However, the experimentally determined dissipation rates are significantly larger than the predicted values.
© Owned by the authors, published by EDP Sciences, 2011