As a result of the requirement that a gas turbine-electric locomotive operate in areas where legislation prohibits operation if the smoke in the exhaust gases exceeds a specified amount, a program was undertaken to develop a combustion system which would meet the requirements without compromising the other performance criteria. This paper describes the physical and chemical nature of smoke, the objective measurement of smoke, the effect of operating variables on smoking tendency, and finally the considerations which led to a combustion-chamber design which met the requirements as evidenced by the engine test results.

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