| Citation: | FENG Ziyi, LI Zhenyao, ZHU Laiyu, et al. Characterization of dynamic flow regulation of rear variable area bypass injector[J]. Journal of Aerospace Power, 2026, 41（1）：20240387 doi: 10.13224/j.cnki.jasp.20240387
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The flow field characteristics during dynamic regulating process of the rear variable area bypass injector (RVABI) were carefully investigated by means of non-constant numerical simulation. In this study, it was found that the bypass stream flow was linearly correlated with the opening of the area regulator during the reciprocating motion of the area regulator, while the change of the main stream flow was further affected by the change rate of the opening of the area regulator, showing hysteresis change characteristics in a single period, and finally the characteristics of the bypass ratio nonlinear hysteresis change were formed. Then, the influence laws of the constant frequency motion mode and the variable frequency motion mode on the characteristic indexes were analyzed, finding that the frequency change of asymmetric motion mode was the main factor contributing to the changes of the flow characteristic indexes of afterburner. Furthermore, in order to quickly predict the change of bypass ratio under different motion modes, nonlinear dynamics modeling of bypass ratio change was carried out, and the average error of the maximum bypass ratio between the model prediction results and the numerical simulation results under different motion modes was 4.1%.
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