University of Twente Student Theses


Turboprop engine - Compressor test RIG

Euving, S. (2016) Turboprop engine - Compressor test RIG.

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Abstract:General Electric has launched project where they develop a turboprop for small airplanes. Part of this engine is tested in Munich. Testing of the compressor of this engine will start in 2017 and the test rig has now to be designed. A uniform flow has to enter the compressor in order to be able to test the compressor in the right way. An air supply system is installed to supply air to the compressor inside the test rig. Due to disturbances upstream of the compressor we ran CFD simulations in order to see if the inlet system allowed uniform flow at the inlet of the compressor. The introduction of swirl by a 90o bends in the flow is analyzed. Although extra swirl is expected, one would need a conformation of this swirl increase. It is confirmed by the simulations that the extra 90 o bend introduces extra swirl and rotation of an upstream valve does not change anything on the amount of swirl. Therefore, it does not guarantee uniform fully developed flow at the end of the inlet system. Inclusion of a flow straightener and as few as possible bends is the best way to ensure uniform flow at the inlet. Next the secondary air system is designed. The design included the choice of measuring devices to be able to control the flow with the right parameters. These measuring devices do not concern the primary airflow, i.e. the air for the propulsion, but the secondary air system. This air system supplies air for sealing, cooling and balancing. Part of this air is supplied by primary air bleeds and a part has to be supplied from an external source. To be able to supply the right amount of gas, the mass-flow has to be measured. Given the required pressure, mass flow and temperature the right measuring devices are chosen. The selection of these devices is based on temperature and pressure limits, turndown ratio, required pipe length and price. Other components discussed in the report are: valves, heat exchanger and the pipe diameters. All previous considerations have been combined to a preliminary design sketch of the SAS.
Item Type:Essay (Master)
General Electric, Germany
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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