Longitudinal high frequency combustion instability is the focus of the present work with particular attention to the CVRC single element combustor, characterized by the variable length of the oxidizer post. Three different geometrical configurations of CVRC combustor are examined and simulated through a quasi-1D Eulerian model, considering three different lengths of the post. The obtained flow field in the three cases is discussed and the limit cycle is described for all the configurations. Qualitative agreement with high fidelity numerical data and experimental data in the literature is obtained, showing marginal instability for the short post configuration and instability for the intermediate and long post. A detailed comparison of limit cycle obtained with high fidelity simulations and quasi-1D analysis is carried out, showing that the latter is characterized by pressure waves of higher intensity.
Low order investigation on longitudinal combustion instability in a variable geometry single element combustor / Frezzotti, MARIA LUISA; D’Alessandro, S.; Huang, C.; Nasuti, F.. - ELETTRONICO. - (2017). (Intervento presentato al convegno 7 TH EUROPEAN CONFERENCE FOR AERONAUTICS AND AEROSPACE SCIENCES (EUCASS) tenutosi a Milano nel 3-6 luglio 2017) [10.13009/EUCASS2017-461].
Low order investigation on longitudinal combustion instability in a variable geometry single element combustor
Maria Luisa Frezzotti;S. D’alessandro;F. Nasuti
2017
Abstract
Longitudinal high frequency combustion instability is the focus of the present work with particular attention to the CVRC single element combustor, characterized by the variable length of the oxidizer post. Three different geometrical configurations of CVRC combustor are examined and simulated through a quasi-1D Eulerian model, considering three different lengths of the post. The obtained flow field in the three cases is discussed and the limit cycle is described for all the configurations. Qualitative agreement with high fidelity numerical data and experimental data in the literature is obtained, showing marginal instability for the short post configuration and instability for the intermediate and long post. A detailed comparison of limit cycle obtained with high fidelity simulations and quasi-1D analysis is carried out, showing that the latter is characterized by pressure waves of higher intensity.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.