Boundary conditions for acoustic eigenmode computations in gas turbine combustion chambers

  title={Boundary conditions for acoustic eigenmode computations in gas turbine combustion chambers},
  author={Nicolas Lamarque and Thierry Poinsot},
Understanding and predicting acoustic instabilities in gas turbine combustion chambers requires the knowledge of the acoustic behaviour of all the elements feeding the combustion chamber (characterized by their impedance). Inlets and outlets of chambers are often represented as one-dimensional ducts and existing methods to evaluate impedances of choked and unchoked nozzles are described: (1) analytical formulae, (2) numerical methods using the linearized Euler equations and a finite-difference… CONTINUE READING


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