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Combustors suitable for both simple- and regenerative-cycle automotive gas turbine engines have been designed and rig developed for low exhaust emissions. The simple-cycle combustor has demonstrated potential for meeting the EPA 1976 automotive emission standards, employing simple practical hardware with no variable geometry. Low emissions have been rig demonstrated with the regenerative combustor, but techniques such as variable geometry and/or regenerator bypass will probably have to be used to achieve target emission levels. Severe transients under actual driving conditions of the regenerative engines are expected to make it particularly difficult to duplicate rig results.

To meet the ignition problems of gas turbines caused by wide variations in environment and the use of a multiplicity of fuels, a glow plug system has been developed which is proving very satisfactory. The system was developed with particular reference to the PT 6 and ST 6 gas turbines where, due to their small size, weight and size are of extreme importance. The glow plug system is extremely lightweight in comparison to spark systems suitable for gas turbines and relatively inexpensive. The ability of the glow plug to operate under extremes of conditions has been proved in many engine applications. It has also proved extremely durable over prior art.