Gnome Turbojet rig (TJ1)
To provide a means for simulating typical thrust engine environments, two of the GETL engine rigs use a Gnome with the power turbine removed.
The 3rd stage nozzle guide vanes which support the rear bearing have been cut back to reduce swirl and an additional vane set has been provided to reduce swirl still further.
The gas generator can then be run as a turbojet engine generating some 3kN of thrust.
The turbojet rigs provide from small scale up to full scale testing of nozzles depending upon the application (0.16m diameter).
Gnome Turboshaft rig (TS1)
TS1 is a very compact rig which uses the Gnome engine in its conventional format - i.e. with the power turbine. The engine is loaded using the compressor from another Gnome engine. These are linked using a gearbox taken from a Westland Wessex helicopter, and is therefore small, lightweight and contains its own oil delivery and cooling system. However the operation is limited to 19,500rpm compressor speed.
The Gnome compressor is mounted underneath the engine, which makes this rig very transportable.
Gnome Turboshaft rigs (TS2, TS3, TS4)
S&C has designed three other engine rigs which use the Gnome in shaft format and loaded by a Gnome compressor, similar to TS1, but in these rigs the gearbox has been designed to allow the engine to be fully loaded to 1235SHP. This generates a large amount of compressed air which can be delivered to other rigs. The engine and compressor are mounted side by side and there is an ancillary oil cooling system.
TS3 is a variant which has been containerised to allow safe operation outside the test facilities.
The turboshaft rigs can supply a compressed air flow of max 4kg/s at 220ºC, with an NPR up to 5.0.