Speed control system for a jet-engine with fluid injection into its compressor

This paper deals with a jet-engine speed control system (SCS), which operates during the aircraft take-off, when the cooling fluid injection system (CFIS) is also active. In order to evaluate the SCS, from its stability and quality point of view, one has established its new mathematical model and transfer function and one has also performed some computer simulations, using experimental data for an existing jet engine, VK-1A. The studies were performed for two different situations, concerning the cooling fluid injection pump: independent (electrically driven pump), or driven by the engine's shaft. Simulations results (system step response) were presented for both situations. Further studies should be extended for multi-spool engines.