Abstract: A gas turbine engine having a turbine housing, air compressor, diffuser, shafts, bearings, seals, ignition system, fuel system and starter with improvements comprising an air charge combustor inlet plate (44), a rotating constant volume combustor (74), a gas metering valve plate (46), a gas distributor plate (102), gas nozzle plates (48), (104) and (112), and turbine wheels (66), (68) and (70); which enables changing pressures inherent to constant volume combustion, in combustion chambers (74E)-(74T), to simultaneously produce a plurality of initially separate, coaxial and annular, virtually continuous gas flow streams for efficiently converting combustion gas energy into useful work.