Turbopump units consist of an air drive, hydraulic pump, reducer and control system. They are designed to power aircraft hydraulic systems not only during emergency modes, but during ground servicing as well. Pressure adjustment at the outlet of a fixed displacement piston pump is achieved through the change of rotor speed.
It provides increase of service life of the pump due to the fact that it mostly operates at lower speeds. Air for the drive is supplied from the aircraft engine compressor or from the external power truck on the airfield. For example, the TNU-86 pump unit has been successfully used in IL-86 aircraft over many years.
The TNUA pump unit is the base for all turbopump units, in which the blisk titanium turbine was used for the first time as the air drive withstanding up to 100,000 rpm while normal operational speed is 24,000 rpm.
The TNUA pump unit was also the base for the TG-17 turbo-generator and the TP-35 turbo-unit developed later to drive the gearbox of the MI-28N helicopter.
|TURBINE DRIVEN UNITS|
|Designation||Turbine (air)||Pump||Mass||Working fluid||Dimensions|