Unsteady behavior of oblique shock train and boundary layer interactions

Wang, Chengpeng; Cheng, Chuan; Cheng, Keming; Xue, Longsheng

doi:10.1016/j.ast.2018.05.054

Cited by 35 publications

(10 citation statements)

References 28 publications

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“…More information can be found in Ref. 19. The stagnation pressure upstream in this study was set to approximately 607.9 kPa, and the stagnation temperature was set to 285 ± 1.5 K.…”

Section: Facility Description and Test Conditionsmentioning

confidence: 99%

Visualization of separation and reattachment in an incident shock-induced interaction

Jiao

Wang

2021

Proceedings of the Institution of Mechanical Engineers, Part G:

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An experimental study is conducted on the qualitative visualization of the flow field in separation and reattachment flows induced by an incident shock interaction by several techniques including shear-sensitive liquid crystal coating (SSLCC), oil flow, schlieren, and numerical simulation. The incident shock wave is generated by a wedge in a Mach 2.7 duct flow, where the strength of the interaction is varied from weak to moderate by changing the angle of attack α of the wedge from 8° and 10° to 12°. The stagnation pressure upstream was set to approximately 607.9 kPa. The SSLCC technique was used to visualize the surface flow characteristics and analyze the surface shear stress fields induced by the initial incident shock wave over the bottom wall and sidewall experimentally which resolution is 3500 × 200 pixels, and the numerical simulation was also performed as the supplement for a clearer understanding to the flow field. As a result, surface shear stress over the bottom wall was visualized qualitatively by SSLCC images, and flow features such as separation/reattachment and the variations of position/size of separation bubble with wedge angle were successfully distinguished. Furthermore, analysis of shear stress trend over the bottom wall by a hue value curve indicated that the relative magnitude of shear stress increased significantly downstream of the separation bubble compared with that upstream. The variation trend of shear stress was consistent with the numerical simulation results, and the error of separation position was less than 2 mm. Finally, the three-dimensional schematic of incident shock-induced interaction has been achieved by qualitative summary by multiple techniques, including SSLCC, oil flow, schlieren, and numerical simulation.

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“…More information can be found in Ref. 19. The stagnation pressure upstream in this study was set to approximately 607.9 kPa, and the stagnation temperature was set to 285 ± 1.5 K.…”

Section: Facility Description and Test Conditionsmentioning

confidence: 99%

Visualization of separation and reattachment in an incident shock-induced interaction

Jiao

Wang

2021

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Mousavi et al [7] found that the changes in ramp dimension as a passive control method and wall temperature as an active control method could change the shock waves characteristics r and the length of the Lambda shock systems. Wang et al [8] reported that the behaviors of unsteady oblique shock train and boundary layer interactions are related to the dynamics of shock motion. The effects of cavity depth on shock train structure was studied by Kumar and Vaidyanathan [9] who showed that the strength of the shock train system decreases with an increase in the depth of the cavity.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of pseudo shock structure in a convergent–long divergent duct

Mousavi

Kamali

Sotoudeh

et al. 2021

Computers & Mathematics with Applications

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In this paper, the Pseudo shock structure in a convergent-long divergent duct is investigated using large eddy simulation on the basis of Smagorinsky-Lilly, Wall-Adapting Local Eddy-Viscosity and Algebraic Wall-Modeled LES subgrid models. The first objective of the study is to apply different subgrid models to predict the structure of Lambda form shocks system, while the ultimate aim is to obtain further control of the shock behavior. To achieve these goals, the dynamic grid adaption and hybrid initialization techniques are applied under the 3D investigation to reduce numerical errors and computational costs. The results are compared to the existing experimental data and it is found that the WMLES subgrid model results in more accurate predictions when compared to the other subgrid models. Subsequently, the influences of the divergent section length with the constant ratio of the outlet to throat area and, the effects of discontinuity of the wall temperature on the flow physics are investigated. The results indicate that the structure of compressible flow in the duct is affected by varying these parameters. This is then further discussed to provide a deeper physical understanding of the mechanism of Pseudo shock motion.

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“…2012; Wang et al. 2018). Therefore, before developing a control scheme, the characteristics of the shock train, especially considering the effects of the SWBLI, should be analysed first.…”

Section: Introductionmentioning

confidence: 99%

“…However, the unstable motion caused by the SWBLI region may bring difficulty for shock train detection and location control. Although a successful closed-loop control has been implemented (Valdivia et al 2014;, 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 2012;Wang et al 2018). Therefore, before developing a control scheme, the characteristics of the shock train, especially considering the effects of the SWBLI, should be analysed first.…”

Section: Introductionmentioning

confidence: 99%