Aircraft hydrocarbon fuel external reformed fuel cell gas turbine combined power generation system

The invention discloses an aircraft hydrocarbon fuel external reformed fuel cell gas turbine combined power generation system. The external reforming hydrogen production is performed for a hydrocarbon fuel in the power generation system to obtain hydrogen for a fuel cell. An external reforming machine and a water circulating bypass are added. The advantages of two power systems of the fuel cell and a gas turbine are combined; the efficiency of the fuel cell, the product composition and the fuel type of the gas turbine are reasonably matched; the tail gas temperature of the fuel cell and the front temperature of the gas turbine are reasonably matched; the pressure ratio of a gas compressor and the working pressure of the fuel cell are reasonably matched; and the power of the gas turbine and the power of the gas compressor are reasonably matched, so that the utilization efficiency of an aircraft fuel is improved. An all-electric aircraft is low in heating and part wear, so that the system reliability is improve