It is well known that lean premixed combustion systems potentially offer better emissions performance than conventional non-premixed designs. However, premixed combustion systems are more susceptible to combustion instabilities than non-premixed systems. Combustion instabilities (large-scale oscillations in heat release and pressure) have a Deleterious effect on equipment, and also tend to decrease combustion efficiency. Design- Ing out combustion instabilities is a difficult process and, particularly if many large-scale Experiments are required, also very costly.
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