| Citation: | LIAO Yinquan, WANG Chunmin, ZHANG Xiaoguang. Low frequency oscillation characteristics of deep throttled staged combustion LOX/kerosene engine[J]. Journal of Aerospace Power, 2026, 41（6）：20240650 doi: 10.13224/j.cnki.jasp.20240650
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In view of the problem of low frequency oscillation on deep throttled staged combustion LOX/kerosene engine, system simulation model based on lumped parameter gas manifold was unable to obtain this kind of oscillation, and literature was seldom devoted to oscillation mechanism and oscillation suppression method. Based on distributed-parameter gas manifold model, the simulation model of staged combustion engine system was established, the low frequency oscillation of deep throttled engine was acquired by simulation, the mechanism of oscillation was analyzed, and oscillation suppression method was studied. Results showed that, compared with the existing model, engine system simulation model covering distributed-parameter gas manifold model could better simulate a deep-throttled rocket engine, based on which 2.5 Hz low-frequency oscillation at 30% nominal thrust with increasing amplitude can be obtained. Oscillation decayed at 40% or higher thrust levels. Feedback circuit consisting of gas manifold, turbopump, and oxidizer feeding line as well as gas generator acting as energy source in engine system motivated the oscillation. Throttling the oxidizer feeding line increased damping on feedback circuit. Oxidizer feeding line resistance not less than 40 times of original value suppressed the oscillation with effect.
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