“…This suggests that when the STLE is perturbed, it moves to a new position with a decaying oscillatory path as shown in the enlarged view of figure 3, which is consistent with the experimental results of Vanstone et al. (2018). Figure 3.Distributions of the flow parameters at the bottom wall and details of the STLE motions within the SWBLI regions: ( a ) and ( b ) .…”
Section: Mechanism Of the Unsteady Movement Induced By Swblisupporting
confidence: 90%
“…2014; Vanstone et al. 2018). The system identification requires no knowledge of the shock train physics; however, a simple physics-based model was then developed (Vanstone et al.…”
Section: Problem Description and Model Equationsmentioning
confidence: 99%
“…2016; Vanstone et al. 2018; Vanstone, Lingren & Clemens 2018; Xiong et al. 2018; Hunt & Gamba 2019).…”
Section: Introductionmentioning
confidence: 99%
“…2014; Vanstone et al. 2018), which can effectively suppress inlet unstart before its onset. However, the unstable motion caused by the SWBLI region may bring difficulty for shock train detection and location control.…”
Section: Introductionmentioning
confidence: 99%
“…2014; Vanstone et al. 2018), the applicability of the control scheme to a highly distorted inlet, in which the shock train location is nonlinear, is still uncertain (Wagner et al. 2010; Tan et al.…”
“…This suggests that when the STLE is perturbed, it moves to a new position with a decaying oscillatory path as shown in the enlarged view of figure 3, which is consistent with the experimental results of Vanstone et al. (2018). Figure 3.Distributions of the flow parameters at the bottom wall and details of the STLE motions within the SWBLI regions: ( a ) and ( b ) .…”
Section: Mechanism Of the Unsteady Movement Induced By Swblisupporting
confidence: 90%
“…2014; Vanstone et al. 2018). The system identification requires no knowledge of the shock train physics; however, a simple physics-based model was then developed (Vanstone et al.…”
Section: Problem Description and Model Equationsmentioning
confidence: 99%
“…2016; Vanstone et al. 2018; Vanstone, Lingren & Clemens 2018; Xiong et al. 2018; Hunt & Gamba 2019).…”
Section: Introductionmentioning
confidence: 99%
“…2014; Vanstone et al. 2018), which can effectively suppress inlet unstart before its onset. However, the unstable motion caused by the SWBLI region may bring difficulty for shock train detection and location control.…”
Section: Introductionmentioning
confidence: 99%
“…2014; Vanstone et al. 2018), the applicability of the control scheme to a highly distorted inlet, in which the shock train location is nonlinear, is still uncertain (Wagner et al. 2010; Tan et al.…”
In a supersonic cylindrical isolator at Mach 2, the structures and frequency characteristics of shock train flow fields were experimentally studied by the schlieren measurement method. According to the design principle of parallel light through schlieren windows in a cylindrical duct, a high-precision conformal optical window pair was designed and integratively processed before. Based on a self-built pipeline structure with conformal windows in a direct-connect wind tunnel under adjustable back-pressure conditions, the shock surfaces in a cylindrical isolator at Mach 2 were first captured by the schlieren method. Then, the schlieren photographs were corrected by a nonlinear image transformation algorithm for the restoration of real shock train structures, and the experimental results were compared with numerical simulation results quantitatively. Finally, the shock train positions were calculated by an image recognition algorithm to analyze the self-excited oscillation frequency characteristics of shock train structures. The methods and experiments in this study enriched optical observation methods of supersonic flows through non-rectangular cross-section isolators in scramjet.
Graphical abstract
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