Numerical prediction of the dynamic behavior of turbulent diffusion flames
- Aachen Univ. of Technology (Germany). Inst. of Steam and Gas Turbines
- B and B-AGEMA GmbH, Aachen (Germany)
Environmental compatibility requires low-emission burners for gas turbine power plants as well as for jet engines. In the past, significant progress has been made developing low NO{sub x} and CO burners. Unfortunately, these burners often have a more pronounced tendency than conventional burner designs to produce combustion driven oscillations. The oscillations may be excited to such an extent that pronounced pulsation may possibly occur; this is associated with a risk of engine failure. The stability of a burner system can be investigated by means of a stability analysis under the assumption of acoustical behavior. The problem with all these algorithms is the transfer function of the flame. A new method is presented here to predict the dynamic flame behavior by means of a full Navier-Stokes simulation of the complex combustion process. The first step is to get a steady-state solution of a flame configuration. After that a transient simulation follows with a sudden change in the mass flow rate at the flame inlet. The time-dependent answer of the flame to this disturbance is then transformed into the frequency space by a Laplace Transformation. This leads, in turn, to the frequency response representing the dynamic behavior of the flame. In principle, this method can be adapted for both diffusion as well as premixed flame systems.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 316142
- Journal Information:
- Journal of Engineering for Gas Turbines and Power, Vol. 120, Issue 4; Other Information: DN: Paper presented at the 41. international gas turbine and aeroengine congress and exhibition, June 10--13, 1996, Birmingham (GB); PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
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