This paper discusses low cost and fast evaluation of effective performance maps for engine components such as nozzles, turbines and compressors using data acquired during transient engine operations. The objective of the present study is to re-evaluate effective engine performance maps when not all the engine component maps are known. The work is equally relevant to account for manufacturing tolerances of different engines resulting in small differences in their performance. Disassembly and rebuilding of an engine as well as degradation in performance due to extensive usage can cause small variations in their performance. If the engine maps do not represent particular engine operations with precision, its performance predictions will differ from the actual characteristics. The engine map evaluation is carried out using data acquired during aircraft transient operations at different altitudes, Mach numbers, angles of attack, side slip angles and during post-stall. The method is based on a conventional dynamic engine model. The unknown engine map characteristics are excluded from the model while the corresponding numbers of some measured values are added to the model input. The evaluated map values are calculated using an inverse solution of the equations of the “shortened” mathematical model. Some jet engine maps may be evaluated simultaneously. Two examples for fragments of compressor and compressor/nozzle map evaluations are presented in this paper.

This content is only available via PDF.
You do not currently have access to this content.