engine station designation

engine station designation

Single-compressor turbojet engine.Dual-compressor turbofan engine with an afterburner.Dual-compressor turbojet engine with an afterburner.Bypass duct jet engine.All gas turbine engines, except those with bypass ducts, are given station designations from 0 to 9, with the station 0 denoting the area ahead of the inlet where the airflow is undisturbed and the number 9 denoting the exhaust flow conditions of the core engine at the nozzle exit. Stations 1 to 8 are the inlet diffuser, inlet duct, fan, compressor, burners, turbine, exhaust duct, and exhaust nozzle, respectively. When an engine has additional compressors or turbines, these are denoted by intermediate numbers like 4.5, 5.5, etc. Those engines with bypass ducts are designated in the same manner but have two numbers instead of one (i.e., the first number is 1). Thus, the station designation is from 12 to 19. Station 12 denotes the inlet fan tip station, the fan discharge is station 13, and so on until the bypass exhaust nozzle is denoted by station 19.