| LI Ruijun,HAO Wang,XIE Yeping,ZHANG Fuzhen.Impact of Variable Geometry Turbine on Variable Cycle Engine Performance[J].航空发动机,2026,52(1):145-153 |
| Impact of Variable Geometry Turbine on Variable Cycle Engine Performance |
| DOI：10.12482/ISSN.1672-3147.20250223002 |
| Key Words:variable geometry turbine engine performance single-bypass dual-bypass variable cycle engine |
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| Abstract:To thoroughly investigate the impact of variable geometry turbines on variable cycle engine performance, an performance
model of a dual-bypass variable cycle engine was developed, along with two characteristic modeling approaches for variable geometry
turbines. Using the subsonic cruise condition under dual-bypass mode as the design point, the effects of individual and combined adjust?
ments of the variable geometry high-pressure turbine and low-pressure turbine on engine performance were examined in ground take-off,
supersonic cruise, and subsonic cruise operating states. The results indicate that in single-bypass mode, a 20% increase in the low-
pressure turbine throat area raises ground take-off thrust and supersonic cruise thrust by approximately 2% and 6%, respectively. A cor?
responding 20% increase in the high-pressure turbine throat area leads to a slight reduction in ground take-off thrust by about 0.3%, while
supersonic cruise thrust increases by approximately 2%. Furthermore, the minimum allowable area of the low-pressure turbine guide vanes
and the maximum allowable area of the high-pressure turbine guide vanes are both constrained by fan stability margin. In dual-bypass
mode, compared to a conventional turbofan engine, the variable cycle engine achieves a fuel consumption rate improvement of
approximately 8% - 9% under subsonic cruise conditions. Within this configuration, the variable geometry low-pressure turbine serves an
essential adjustable component for the variable cycle engine. In contrast, whether the high-pressure turbine is variable has a relatively
minor impact on fuel consumption rate. |
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