Hypersonic transition induced by three isolated roughness elements on a flat plate

Duan, Zhiwei; Xiao, Zhixiang

doi:10.1016/j.compfluid.2017.08.006

Cited by 19 publications

(2 citation statements)

References 10 publications

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“…The effect of roughness elements on the hypersonic boundary layer receptivity mechanism has been researched. The influence of roughness element shape, location, height, and number [ 20 , 21 , 22 , 23 ] on the receptivity and stability mechanism of hypersonic boundary layer have been widely studied. The receptivity mechanism of free-stream disturbances in the hypersonic boundary layer is, to some extent, changed by the roughness element.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Roughness Element on the Hypersonic Boundary Layer Receptivity Due to Different Types of Free-Stream Disturbance with a Single Frequency

Shi

Wang

et al. 2019

Entropy

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The hypersonic flow field around a blunt cone was simulated using a high-order finite difference method. Fast acoustic waves, slow acoustic waves, entropy waves, and vortical waves were introduced into the free-stream to determine the influence of a free-stream with disturbances on the hypersonic flow field and boundary layer. The effect of disturbance type on the evolution of perturbations in the hypersonic boundary layer was analyzed. Fast Fourier Transform was adopted to analyze the effect of the disturbance type on the evolution of different modes in the boundary layer. A roughness element was introduced into the flow field to reveal the impact of the roughness element on hypersonic boundary layer receptivity. The results showed that a free-stream with disturbances affected the hypersonic flow field and boundary layer; acoustic waves had the greatest influence. The impact of slow acoustic waves on the flow field was mainly concentrated in the region between the shock and the boundary layer, whereas the influence of fast acoustic waves was mainly concentrated in the boundary layer. Multi-mode perturbations formed in the boundary layer were caused by the free-stream with disturbances, wherein the fundamental mode was the dominant mode of the perturbations in the boundary layer caused by fast acoustic waves, entropy waves, and vortical waves. The dominant modes of the perturbations in the boundary layer caused by slow acoustic waves were both the fundamental mode and the second harmonic mode. The roughness element changed the propagation process of different modes of perturbations in the boundary layer. In the downstream region of the roughness element, perturbations in the boundary layer caused by the slow acoustic waves had the greatest influence. The second harmonic mode in the boundary layer was significantly suppressed, and the fundamental mode became the dominant mode. The effects of fast acoustic waves and entropy waves on the boundary layer receptivity were similar, except the amplitude of the perturbations in the boundary layer caused by the fast acoustic waves was larger.

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Section: Introductionmentioning

confidence: 99%

Effect of a Roughness Element on the Hypersonic Boundary Layer Receptivity Due to Different Types of Free-Stream Disturbance with a Single Frequency

Shi

Wang

et al. 2019

Entropy

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“…It is known that surface disturbances can significantly change flow structure and may cause flow separation in the hypersonic boundary layer. The effect of roughness element shape (cylinder, square, and micro-ramp) on the stability of the boundary layer was investigated through experimental method by Duan et al [22] and numerical simulations by Ye et al [23]. Zhou et al [24] also analyzed Free stream disturbances include acoustic, vortical, and entropy disturbances while acoustic disturbance can be divided into slow acoustic disturbance and fast acoustic disturbance.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Roughness Element on the Receptivity of a Hypersonic Boundary Layer over a Blunt Cone Due to Pulse Entropy Disturbance with a Single Frequency

Wang

Shi

Tang

et al. 2018

Entropy

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A high-order finite difference method was used to simulate the hypersonic flow field over a blunt cone with different height roughness elements. The unsteady flow field induced by pulse disturbances was analyzed and compared with that under continuous disturbances. The temporal and spatial evolution characteristics of disturbances in the boundary layer were investigated and the propagation of different disturbance modes in the boundary layer was researched through the fast Fourier transform (FFT) method. The effect of the roughness element on the receptivity characteristic of the hypersonic boundary layer under pulse entropy disturbances was explored. The results showed that the different mode disturbances near roughness in the boundary layer were enlarged in the upstream half of the roughness element and suppressed in the downstream half. However, the effect of roughness weakened gradually as the disturbance frequency increased in the boundary layer. A phenomenon of mode competition in the downstream region of the roughness element exited. As the disturbances propagated downstream, the fundamental mode gradually became the dominant mode. A certain promotion effect on the mode competition was induced by the roughness element and the effect was enhanced with the increase in the roughness element height.Entropy 2018, 20, 404 2 of 15 of disturbance has a great influence on the receptivity of the hypersonic boundary layer. Many scholars have analyzed the effect of the types of disturbance on the receptivity of the hypersonic boundary layer through experiment or simulation methods [6][7][8][9][10].

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Influence of geometric parameters of discrete roughness elements on hypersonic boundary layer instability

Lee,

Park

2024

Aerospace Science and Technology

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Hypersonic transition induced by three isolated roughness elements on a flat plate

Cited by 19 publications

References 10 publications

Effect of a Roughness Element on the Hypersonic Boundary Layer Receptivity Due to Different Types of Free-Stream Disturbance with a Single Frequency

Effect of a Roughness Element on the Hypersonic Boundary Layer Receptivity Due to Different Types of Free-Stream Disturbance with a Single Frequency

Effect of a Roughness Element on the Receptivity of a Hypersonic Boundary Layer over a Blunt Cone Due to Pulse Entropy Disturbance with a Single Frequency

Influence of geometric parameters of discrete roughness elements on hypersonic boundary layer instability

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