Dynamic Simulation of a Wave-Rotor-Topped Turboshaft Engine

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 e uid dynamics- (CFD-) based wave-rotor code in combination with an implicit, one-dimensional, component-level dynamic engine simulation code. Transient responses to rapid fuel e ow rate changes and compressor inlet pressurechanges aresimulated and compared with those of a similarly sized, untopped, turboshaft engine. Resultsindicate 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 thewave-rotor-topped engine during rapid acceleration. In fact, thecompressor actually movesslightly 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.