| Citation: | WANG He, WANG Jun, SHI Lei, et al. Performance dispersion control of aero turbofan engine[J]. Journal of Aerospace Power, 2025, 40（8）：20240543 doi: 10.13224/j.cnki.jasp.20240543
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Research on the dispersion control methods during the engine acceptance test process is a key to control performance dispersion throughout the entire life cycle of aero turbofan engine. Based on the deviation of component characteristics and geometric area, research on the correlation between engine matching and performance dispersion was carried out. The control methods of fan pressure ratio tolerance ±0.75% and rotors relationship ±0.5% were proposed. Through tests on 10 new engines, thrust dispersion reduced from ±4.9% to ±2.2% and exhaust gas temperature dispersion reduced from ±2.0% to ±0.7%. Based on the control methods of fan pressure and rotors relationship, an engine performance degradation model, which characterized the relationships among thrust degradation, working time, exhaust gas temperature and repair, was established to solve thrust dispersion during the whole life cycle. The control method of exhaust temperature margin 20—30 ℃ of new engine was proposed. Through endurance test on 1 engine, intermediate state thrust was degraded by 1.2%. The superimposed thrust dispersion of the other 9 new engines was ±3.4%, helping to solve the thrust dispersion problem during the whole life cycle.
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