Dynamic simulation of a wave-rotor-topped turboshaft engine
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abstract
The dynamic behavior of a wave-rotor-topped turboshaft engine is examined using a numerical simulation. The simulation utilizes an explicit, one-dimensional, multipassage, computational fluid dynamics- (CFD-) based wave-rotor code in combination with an implicit, one-dimensional, component-level dynamic engine simulation code. Transient response to rapid fuel flow rate changes and compressor inlet pressure changes are simulated and compared with those of a similarly sized, untopped, turboshaft engine. Results indicate that the wave-rotor-topped engine responds in a stable and rapid manner. Furthermore, during certain transient operations, the wave rotor actually tends to enhance engine stability. In particular, there is no tendency toward surge in the compressor of the wave-rotor-topped engine during rapid acceleration. In fact, the compressor actually moves slightly away from the surge line during this transient. This behavior is precisely the opposite to that of an untopped engine. The simulation is described. Issues associated with integrating CFD and component-level codes are discussed. Results from several transient simulations are presented and discussed.
