Restrictions of emissions for civil aircraft engines, on the one hand, and the need in increasing the engine efficiency, on the other hand, cause difficulties during development of low-emission combustors for such engines.

The formation of harmful substances (NOx and CO) during turbulent combustion of a lean imperfectly prepared mixture of methane and air in a low-emission combustion chamber (LECC) is studied numerically.

To reduce the NOx emission level in low emission combustors designed for industrial gas turbines, the technology of lean preliminary mixed fuel-air mixtures burning is used. But this gives rise to combustion instability modes.

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