边界条件对变循环发动机多维度仿真模型的影响研究

In order to study the effects of the processing method of boundary parameters transfer between the zero-dimensional engine simulation model and the three-dimensional core driven fan stage（CDFS）simulation model in the multi-level variable cycle engine（VCE）simulation model on the simulation result，the three-dimensional coupled simulation model for CDFS and forward variable area bypass injector（FVABI）is established in this paper，as well as three-dimensional single CDFS simulation model. The differences in CDFS working characteristics and static pressure distribution around CDFS outlet obtained from the two three-dimensional simulation models are compared. Then both the CDFS working characteristics are integrated into cycle parameter analysis with iterative coupled approach to investigate the effect of the difference in static pressure distribution at CDFS outlet on the simulation result of multi-level VCE simulation model. The results indicate that the stable working range of CDFS in the three-dimensional coupled simulation model is affected by the static pressure at core outlet and the corrected mass flow rate of numerical surge point is different from that of three-dimensional single CDFS simulation model. The existence of FVABI reduces the influence of boundary conditions of averaged static pressure at core outlet and FVABI outlet on the static pressure distribution around CDFS outlet，and the mass flow rate distribution between CDFS core and bypass can significantly affect the static pressure distribution around CDFS outlet. Therefore，the static pressure distribution around CDFS outlet obtained from three-dimensional coupled simulation model is more realistic and reasonable. Compared with the results obtained from boundary condition of averaged static pressure，the pressure ratio and isentropic efficiency of CDFS core is not changed significantly，and the pressure ratio and isentropic efficiency of CDFS bypass are reduced by 0.86% and 2.27%，respectively，when the realistic static pressure distribution are employed at CDFS outlet in multi-level VCE simulation model under supersonic cruise condition，resulting in a 0.41 % increase in VCE thrust and a significant reduction in number of iterations.