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.