变循环发动机变几何特性分析及其匹配优化

A component-level model suitable for variable cycle engines (VCE) was developed, and a dual-bypass VCE simulation model was established to analyze the coupled regulation mechanisms of variable geometry components and their impact on engine performance. The dual-bypass VCE model was validated against a conventional turbofan engine (F135-PW-100), and the overall performance matching optimization was carried out based on the influence characteristics of variable geometry. The results showed that adjusting the front/rear variable area bypass injectors (F/RVABI) can modify the bypass ratio, with RVABI adjustment towards the outer bypass increasing the thrust by 2.1%. Closing the mode selection valve (MSV) increased specific thrust by 6.8%. Core-driven fan stage (CDFS) vane adjustment improved stall margin but had limited optimization effects. Under the combined adjustment of the fan, low pressure turbine, and nozzle, the thrust in the dual-bypass mode can be increased by 5.75%.