MODELING TIP CLEARANCE EFFECTS IN MULTISTAGE AXIAL COMPRESSORS

A variety of techniques for simulating the effects of rotor tip cleara nces in multistage axial compressors is discussed. Proper recognition of stage coupling and rematching effects is shown to be key to success ful modeling of the overall behavior of actual engine compression syst ems. The application of a relatively simple one-dimensional unsteady r ow-by-row systems analysis is presented and shown to compare well to t est data from several engine compressors.