| Citation: | WANG J M，GUO Y Q，YU H F. Extension method of engine low speed characteristics based on backbone features[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（9）：2351-2360 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0634
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The blowing action of the incoming flow may cause the functioning state of the rotating components to alter when they operate at high altitudes but low speeds. The compressor is in a special “mixer” or “turbine” working state at such a condition, which makes a discontinuous change of efficiency during the dynamic operation of the engine. In order to solve this problem, the method based on the backbone features developed by National Aeronautics and Space Administration (NASA) and General Electric Company (GE) was used to transform the characteristics of rotating parts. It is possible to expand the low-speed range characteristics of rotating parts and successfully prevent the invalidation of the interpolation of efficiency characteristics at low speeds by studying the changing trends of the backbone and off-backbone features at low speeds. Taking a military turbofan engine as an example, the windmilling characteristics under different flight conditions are calculated. The results show that this method can reflect the special working conditions of the compressor with a pressure ratio of less than 1 at low speeds, and the calculation of windmilling characteristics under different flight conditions is reasonable.
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