DESCRIPTION

Technical Description

The trainer ET 792 investigates the behaviour of a system in a two-shaft arrangement (vehicle drive, ship's propulsion or generator drive) and of a jet engine (aircraft's propulsion). 

At the core of the trainer are a so-called gas generator and a free-running power turbine. The gas generator consists of a radial compressor, a combustion chamber and a radial turbine. The compressor and turbine are mounted on a shaft. 

Depending on the arrangement, the energy of the exhaust gas stream is either converted into mechanical energy in the free-running power turbine or accelerated and transformed into thrust via a nozzle. It is possible to convert from a single-shaft to a two-shaft arrangement in just a few actions. 

The gas turbine works as an open cyclic process, with the ambient air being drawn out and fed back in. Intake and exhaust silencers reduce the noise in operation of the power turbine. The use of propane as the combustion gas ensures clean, odourless operation. A start-up fan is used to start the gas turbine. 

Relevant measuring values are recorded by sensors and indicated on the display and control panel. At the same time, the measured values can also be transmitted directly to a PC via USB. The data acquisition software is included. 

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- familiarisation with the function and typical behaviour during operation of a gas turbine
- operation as jet engine
- operation as power turbine 
- determining effective power
- thrust measurement
- determining specific fuel consumption
- recording the characteristic of the power turbine
- determining the system efficiency