Turbine engine including a steam system

A turbine engine for an aircraft, the turbine engine comprising:

• a core turbine engine including:
• a core air flow path for core air to flow therethrough;
• a combustor located in the core air flow path to receive compressed air and fluidly coupled to a fuel source to receive fuel, the fuel being injected into the combustor to mix with the compressed air to generate a fuel and air mixture, the fuel and air mixture being combusted in the combustor to generate combustion gases;
• a core shaft;
• and
• a turbine located downstream of the combustor to receive the combustion gases and to cause the turbine to rotate, the turbine coupled to the core shaft to rotate the core shaft when the turbine rotates;
• a fan having a fan shaft coupled to the core turbine engine to rotate the fan shaft;
• and
• a steam system fluidly coupled to the core air flow path to provide steam to the core air flow path to add mass flow to the core air, the steam system including:
• a boiler located downstream of the combustor, the boiler receiving water and being fluidly connected to the combustor to receive the combustion gases and to boil the water to generate the steam;
• a steam turbine fluidly coupled to the boiler to receive the steam from the boiler and to cause the steam turbine to rotate, the steam turbine being coupled to the core shaft to rotate the core shaft when the steam turbine rotates;
• and
• at least one steam control valve located downstream of the boiler and upstream of the core air flow path to control a differential pressure across the steam turbine.