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ET 792

- Operation with power turbine or as jet engine with propelling nozzle
- Simple model of a gas turbine1
- Display and control panel with illustrative process schematic
- Propane gas as fuel1


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 



[1] function and behaviour during operation of a gas turbine
[2] single-shaft arrangement for operation as jet engine
[3] two-shaft arrangement for operation with power turbine
[4] start-up fan to start the gas turbine
[5] asynchronous motor with frequency converter as generator
[6] conversion of generated electrical energy into heat using four 600W braking resistors
[7] GUNT software for data acquisition via USB under Windows Vista or Windows 7

Technical Data

Gas generator (compressor and turbine)
- speed range: 60000...125000min-1
- max. pressure ratio: 1:2,2
- max. mass flow rate (air): 0,125kg/sec
- max. fuel consumption: 120g/min 
- fuel nozzle pressure: 2,5...4bar
Power turbine 
- speed range: 10000...40000min-1
- mechanical power: 0...2kW
- electrical power: 0...1,5kW
- sound level at 1m distance: max. 80dB(A) 
Operation as jet engine
- thrust measurement: 0...50N
- sound level at 1m distance: max. 110dB(A) 
Measuring ranges
- temperature: 6x -200...1000°C / 1x -40...1300°C 
- speed: 0...199999min-1 
- electrical power: 0...1999W 
- fuel mass flow rate: 0...10kg/h
- fuel supply pressure: 0...25bar
- fuel nozzle pressure: 0...4bar
- combustion chamber pressure loss: 0...50mbar
- pressure, turbine inlet in gas generator: 0...2,5bar
- pressure, power turbine inlet: 0...250mbar

Dimensions and Weight
LxWxH: 1500x680x1820mm
Weight: approx. 325kg Required for Operation 230V, 50Hz, 1 phase or 400V, 50/60Hz, 3 phase or 230V, 60Hz/CSA, 3 phase
Cooling water 200L/h, propane gas 4...15bar
Ventilation 500m³/h, exhaust gas routing required

Scope of Delivery
1 trainer
1 GUNT software CD + USB cable
1 set of tools
1 set of instructional material 

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