Conception of a UHB engine simulator for the essential characteristics of a true-scale engine

Turbine powered simulators (TPSs) usually are not able to simulate the whole spectrum of characteristic features of an original engine correctly and simultaneously. The difficulties in scaling down an engine are the reasons for these deficiencies. The order of magnitude of the errors resulting from these problems is shown for a turbine powered simulator set up conventionally. A revised simulator concept that avoids most of the significant deficiencies of conventional simulators is presented considering a typical UHB (ultra high bypass) engine. A correct simulation, which permits the full transmission of simulation results to the real engine, requires the correct simulation of the secondary cycle, the primary nozzle flow, and the inlet flow. Contrary to a conventional TPS, the new concept, besides the correct simulation of the specific thrust, also allows the correct simulation of the thrust partition between the secondary and the primary cycle