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Jet engines are gas turbines which generate thrust. Jet engines are used on aircraft for propulsion due to their low weight and high performance.
The ET 796 trainer investigates the behaviour during operation of a jet engine.
ET 796 includes the following components: jet engine (with compressor, annular combustion chamber, turbine, and propelling nozzle), fuel system, starter and ignition system, and measurement and control equipment. The gas turbine works as an open cyclic process, with the ambient air being drawn out and fed back in.
In the jet engine, the ambient air drawn in is first brought to a higher pressure in the single-stage radial compressor. In the downstream combustion chamber, fuel is added to the compressed air and the resulting mixture is ignited. The temperature and flow velocity of the gas increase. The gas flows out of the combustion chamber into the single-stage axial turbine and discharges a portion of its energy to the turbine. This turbine drives the compressor. In the propelling nozzle, the partially expanded and cooled gas expands to ambient atmospheric pressure and the gas accelerates to almost the speed of sound. The high-speed gas outflow generates the thrust. In order to reduce the outlet temperature, the exhaust gas stream is mixed with the ambient air in a mixing pipe. The gas turbine is started fully automatically with the aid of an electric starter.
The annular combustion chamber is between the compressor and the turbine. With optimum fuel utilisation, low pressure loss, and good ignition properties, the ring shape of this combustion chamber is typical of the design used in jet engines. The movable turbine platform, with a force sensor, enables measurement of the thrust.
The speed, temperatures, and mass flow rates of the air and fuel are recorded using sensors. The measured values can be read on digital displays. 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
- behaviour during operation of a jet engine including start-up procedure
- determination of the specific thrust
- determination of the specific fuel consumption
- determination of lambda (fuel-air ratio)
 experiments relating to the function and behaviour during operation of a jet engine
 gas turbine with radial compressor and axial turbine as jet engine
 single-shaft engine
 protective grating for the jet engine
 turbine mounted on moving base with force sensor for thrust measurement
 electric starter for fully automatic start-up
 additional remote control for display and control of the jet engine
 GUNT software for data acquisition via USB under Windows Vista or Windows 7
- max. thrust: 82N at 117000min-1
- speed range 35000...117000min-1
- fuel consumption: max. 22L/h (full load)
- exhaust gas temperature: 610°C
- sound level at 1m distance: max. 130dB(A)
Fuel: kerosene or petroleum + turbine oil
Starting system: electric starter
1 tank for fuel: 5L
- differential pressure: 0...150mbar
- combustion chamber pressure: 0...2,5bar
- temperature: 2x 0...1200°C / 1x 0...400°C
- speed: 0...120000min-1
- fuel consumption: 0...25L/h
- force: 0...+/-200N
Dimensions and Weight
Weight: approx. 112kg Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz, 1 phase or 120V, CSA, 1 phase
Ventilation 1000m³/h, exhaust gas routing required
Scope of Delivery
1x turbine oil (250mL)
1 GUNT software CD + USB cable
1 set of instructional material
1 manufacturer's instruction manual (turbine)