I have long been wondering what is the official name of this little air intake tube located in front of the fan blades and its intended functions. I did search it on google but it was in vain. I guess that it may be a pitot tube installed inside a jet engine for gauging the airspeed of the engine intake air.
That's the EPR inlet pressure sensor (there's another one located aft of the engine in the exhaust).
EPR = Engine Pressure Ratio, one way to measure thrust.