Influences of wall vibration on shock train structures and performance of two-dimensional rectangular isolators in scramjet engine

Meng, Xianzong; Ye, Zhengyin; Hong, Zheng; Ye, Kun

doi:10.1016/j.actaastro.2019.09.035

Cited by 10 publications

(5 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The numerical configuration of the isolator, as illustrated in Figure 3, is based on our previous research endeavors [12][13][14]. The computational configuration employs a 2-D isolator with a rectangular geometry that maintains a constant width.…”

Section: Computational Configurationmentioning

confidence: 99%

“…However, the aeroelastic challenges associated with the isolator have not received as much attention, despite their significant implications for the development of future hypersonic vehicles [10,11]. To address this gap, a series of numerical studies have been initiated, focusing on the effects of flexible structures on the isolator's flow field and performance [12][13][14][15][16][17]. This research constitutes an integral part of these ongoing efforts.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, recent studies have revealed that the FSI between thin-walled panels and the internal flow of isolators is considerably more complex. Meng's studies [12,13] have demonstrated that forced structural vibrations significantly influence the flow structures and performance of the isolator. In this context, thin-walled plates were placed in an isolator with an incoming Mach number of 1.6 to investigate the FSI between the normal shock train and the thin-walled plates.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fluid–Structure Interactions between Oblique Shock Trains and Thin-Walled Structures in Isolators

Meng,

Zhao,

Wang

et al. 2024

Aerospace

Self Cite

View full text Add to dashboard Cite

Understanding aeroelastic issues related to isolators is pivotal for the structural design and flow control of scramjets. However, research on fluid–structure interactions (FSIs) between thin-walled structures and the isolator flow remains limited. This study delves into the FSIs between thin-walled panels and the isolator flow, as characterized by an oblique shock train, by quantitatively analyzing 11 flow parameters assessing the structural response, separation zones, shock structures, flow symmetry, and performance. The results reveal that an FSI triggers panel flutter under oblique shock train conditions, with the panel shapes exhibiting a combination of first- and second-mode responses, peaking at 0.75 of the panel length. Compared to rigid wall conditions, isolators with a flexible panel at the bottom wall experience downstream movement of the separation zones and shock structures, reduced flow symmetry, and minor changes in performance. Transient fluctuations occur due to the panel flutter. Two flexible panels at the top and bottom walls have a comparatively lesser influence on the averaged parameters but exhibit more violent transient fluctuations. Furthermore, the FSI effects under oblique shock train conditions are contrasted with those under normal shock train conditions. The flutter response under normal shock train conditions is more pronounced, with a larger amplitude and higher frequency, driven by the heightened participation of the first-mode response. The effects of FSIs under normal shock train conditions on the averaged parameters are the opposite (with a larger influence) to those under oblique shock train conditions, with significantly more drastic transient fluctuations. Overall, this study sheds light on the complex and substantial influence of FSIs on the isolator flow, emphasizing the necessity of considering FSIs in future isolator design and development endeavors.

show abstract

Section: Computational Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fluid–Structure Interactions between Oblique Shock Trains and Thin-Walled Structures in Isolators

Meng,

Zhao,

Wang

et al. 2024

Aerospace

Self Cite

View full text Add to dashboard Cite

show abstract

“…Gramola et al [12] studied the impact response of three-dimensional flexible plates under the control of active (using manual valve) and passive (through breathing hole) cavity pressure through wind tunnel experiments, and studied the impact response of oblique shock wave and positive shock wave to three-dimensional flexible plates. In 2020, Meng et al [13] studied the influence of changing panel vibration parameters on flow field in isolator through numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Influence of panel oscillation on the shock flow field in isolator under complex background wave system

Wang

Zhu

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

In this paper, a self-developed solver is used to numerically simulate the isolator section under complex inlet conditions, and the influence of forced panel vibration on the shock flow field in the isolator under complex inlet conditions is investigated. The results show that the forced vibration of the panel has a certain influence on the shock flow field in the isolator under complex inlet conditions.

show abstract

“…4 Although not catastrophic at an early stage, panel flutter remains a structural concern because of the potential for fatigue failure. 5 Panel flutter will also significantly disturb the downstream flow field, which could compromise the engine performance 6,7 and increase noise generation. 8 Studies on panel flutter in supersonic flow are thoroughly examined and reviewed by Dowell 9 and Mei.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of characteristic change of panel flutter caused by oblique shock impingement

Meng,

Ye,

2023

Proceedings of the Institution of Mechanical Engineers, Part G:

Self Cite

View full text Add to dashboard Cite

Compared to the shock-free condition, the weak shock impingement stabilizes the flexible panel, while the strong shock impingement leads to the early onset of panel flutter with a significant increase in flutter amplitude and frequency. However, the reason for this change by shock impingement remains unclear. The current research examines the mechanism of this change by an in-house code where the von Kármán’s large deflection plate theory is coupled with two-dimensional Euler equations. Compared to the shock-free condition, the oblique shock impingement leads to the change of local dynamic pressure on the panel as well as the static pressure differential across the panel. The analysis on the influence of these changes indicates that, on the one hand, the average dynamic pressure on the panel becomes larger than the shock-free condition, accelerating the onset of panel flutter. On the other hand, the change of the static pressure differential across the panel alters the coupling characteristic between different natural frequencies (modes) of the panel structure. The dynamic response of panel flutter under shock impingements is dominated by the coupling between the second and third modes instead of the first two modes for panel flutter under the shock-free condition. The combined effect of these two changes leads to the change of flutter characteristics of the panel under shock impingement. These findings provide valuable insights into the mechanism of shock-induced panel flutter.

show abstract

Influences of wall vibration on shock train structures and performance of two-dimensional rectangular isolators in scramjet engine

Cited by 10 publications

References 31 publications

Fluid–Structure Interactions between Oblique Shock Trains and Thin-Walled Structures in Isolators

Fluid–Structure Interactions between Oblique Shock Trains and Thin-Walled Structures in Isolators

Influence of panel oscillation on the shock flow field in isolator under complex background wave system

Mechanism of characteristic change of panel flutter caused by oblique shock impingement

Contact Info

Product

Resources

About