a combustion method which can reduce the emission of nox and smoke . in sharp contrast to the conventional combustion method , the method of the invention can remarkably reduce the emission of both of nox and the smoke simultaneously , by adopting a specific flow pattern of fuel and combustion air in the combustion chamber , the pattern has been obtained as a result of studies and experiments concerning the influence of the intensity of mixing of the fuel and the combustion air on the emission of nox .