| Citation: | LI Yaohua, LI Jianqiang, HE Chengjun, et al. Shock reflection characteristics in single expansion ramp nozzle under flow separation condition[J]. Journal of Aerospace Power, 2023, 38（9）：2279-2287 doi: 10.13224/j.cnki.jasp.20210624
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Combined with the focus schlieren and dynamic pressure measurement technology, the shock reflection inside a single expansion ramp nozzle (SERN) was investigated under the condition of flow separation. The flow characteristics of shock reflection were analyzed, and the flow separation characteristics were compared for different wave configurations of shock reflection. Results showed that the shock reflection configuration transitioned from Mach reflection (MR) to regular reflection (RR), during the change of nozzle pressure ratio (NPR) from 3.06 to 5.07. The MR structure inside SERN was obviously asymmetrical duo to the asymmetric upper and lower walls. Based on shock polar representation, the mechanism of asymmetric MR was analyzed. The pressure gradient in the vertical flow direction upstream the Mach stem was the source of asymmetric MR. A hysteresis did not exist in the transition process between RR and MR, during increasing and decreasing processes of NPR, but the shock position experienced a hysteresis effect. The percentage deviation of shock position increased with the increasing oscillation frequency, during increasing and decreasing processes of NPR. The lower oscillation frequency of NPR indicated the larger oscillation amplitude of shock position.
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