INDIGENOUS AIR TURBINE STARTER
Gas Turbine Engine is provided with a starter to generate the initial torque for the compressor turbine rotor system for attaining self-sustaining speed with the combustor light-up. This is achieved using hydraulic, electric, Air Turbine Starter (ATS) or Jet Fuel Starter (JFS). Gas Turbine Research Establishment (GTRE), Bangalore, in collaboration with M/s Turbo Tech and Indian Institute of Science has manufactured the indigenous ATS and designed and installed a test rig to carry out the qualification and endurance tests. ATS utilises the pneumatic energy from low pressure air to drive the high-speed impulse turbine wheel producing ahigh initial torque.
The high speed of turbine wheel is
reduced at the starter output shaft using a reduction gearbox. The power is
transmitted from the ATS to the engine through a clutch, which also provides
means to disengage the starter from the engine when it attains a particular
speed. A flywheel is used to absorb the power of the starter and to simulate
the moment of inertia of the engine. Terry turbine concept is incorporated
on the flywheel for the braking arrangement consisting of a nozzle for
impingement of air on to terry turbine. The complete rig is acoustically
treated in order to suppress the noise created during the braking action.