A generator arrangement , comprising: a power module , comprising: a turbine arranged along a rotation axis; an interconnect shaft fixed in rotation relative to the turbine ; and a compressor with a regenerative compressor wheel fixed in rotation relative to the interconnect shaft supported for rotation with the turbine about the rotation axis; wherein the turbine is an impulse turbine ; an air bearing arranged axially between the turbine and the regenerative compressor wheel , the air bearing supporting the turbine and the regenerative compressor wheel for rotation about the rotation axis; and a gas generator fluidly coupling the regenerative compressor wheel to the turbine ; characterized by further comprising: a radial compressor in fluid communication with the regenerative compressor wheel , the radial compressor arranged on a side of the regenerative compressor wheel axially opposite the turbine ; a blowdown fuel module in fluid communication with the gas generator; and an outlet port in fluid communication with the regenerative compressor wheel , wherein the outlet port is defined axially between the regenerative compressor wheel and the turbine . a power module , comprising: a turbine arranged along a rotation axis; an interconnect shaft fixed in rotation relative to the turbine ; and a compressor with a regenerative compressor wheel fixed in rotation relative to the interconnect shaft supported for rotation with the turbine about the rotation axis; wherein the turbine is an impulse turbine ; an air bearing arranged axially between the turbine and the regenerative compressor wheel , the air bearing supporting the turbine and the regenerative compressor wheel for rotation about the rotation axis; and a gas generator fluidly coupling the regenerative compressor wheel to the turbine ; a turbine arranged along a rotation axis; an interconnect shaft fixed in rotation relative to the turbine ; and a compressor with a regenerative compressor wheel fixed in rotation relative to the interconnect shaft supported for rotation with the turbine about the rotation axis; wherein the turbine is an impulse turbine ; an air bearing arranged axially between the turbine and the regenerative compressor wheel , the air bearing supporting the turbine and the regenerative compressor wheel for rotation about the rotation axis; and a gas generator fluidly coupling the regenerative compressor wheel to the turbine ; characterized by further comprising: a radial compressor in fluid communication with the regenerative compressor wheel , the radial compressor arranged on a side of the regenerative compressor wheel axially opposite the turbine ; a blowdown fuel module in fluid communication with the gas generator; and an outlet port in fluid communication with the regenerative compressor wheel , wherein the outlet port is defined axially between the regenerative compressor wheel and the turbine . a radial compressor in fluid communication with the regenerative compressor wheel , the radial compressor arranged on a side of the regenerative compressor wheel axially opposite the turbine ; a blowdown fuel module in fluid communication with the gas generator; and an outlet port in fluid communication with the regenerative compressor wheel , wherein the outlet port is defined axially between the regenerative compressor wheel and the turbine . <EOS>