<p>The engine of JAS 39 Gripen, RM12, has recently been equipped with a new flameholder and a new engine inlet. This change has caused an increased noise level from the engine when the afterburner is in use. The noise level reaches its peak when the afterburner is partially used. The problem is thought to be unstable combustion in the regions around the flameholder. A solution to the problem has been proposed by Volvo Aero. The idea is to modify the software in the engine control unit (FADEC) that changes the airflows in the engine. This master thesis implements the proposed changes and analyzes the effects of this implementation. The analysis is done by simulations of a model of the engine that Volvo Aero has created and implemented in MatrixX/SystemBuild. Simulations showed that it is possible to achieve the desired result by the software changes. Further the simulations showed some problems with stability for the engine when controlled by the modified control unit. This was solved by implementing a filter in the FADEC software.</p>
| Identifer | oai:union.ndltd.org:UPSALLA/oai:DiVA.org:liu-282 |
| Date | January 2005 |
| Creators | Ervestrand, Jonas |
| Publisher | Linköping University, Department of Electrical Engineering, Institutionen för systemteknik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | Swedish |
| Detected Language | English |
| Type | Student thesis, text |
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