Effects of Porous Walls on Hypersonic Boundary Layers over a Sharp Cone

Stephen, Sharon; Michael, Vipin

doi:10.2514/1.j052082

Cited by 13 publications

(19 citation statements)

References 29 publications

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“…It was shown that the detailed surface structure is not as important as the overall porosity. Stephen and Michael 23 theoretically considered the effect of a porous wall on Mack's first mode for a hypersonic boundary layer on a sharp slender cone. They found that the porous wall significantly destabilized the non-axisymmetric modes.…”

Section: Increasing Of Environmental Disturbance Amplitudementioning

confidence: 99%

The stabilization of a hypersonic boundary layer using local sections of porous coating

Wang

Zhong

2012

Physics of Fluids

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The stabilization effect of porous coating on the hypersonic boundary layers over flat plates and cones has been studied by theoretical analyses, experiments, and numerical simulations. It was found that porous coating slightly destabilizes Mack's first mode whereas it significantly stabilizes Mack's second mode. In previous studies, porous coating covers either the entire flat plate or the surface around half the cone circumference. The effect of porous coating location on boundary-layer stabilization has not been considered. Furthermore, the destabilization of Mack's first mode has not been studied in detail. In this paper, the stabilization of a Mach 5.92 flat-plate boundary layer using local sections of porous coating is studied with the emphasis on the effect of porous coating location and the first-mode destabilization. Artificial disturbances corresponding to a single boundary-layer wave are introduced near the leading edge. A series of stability simulations are carried out by locally putting felt-metal porous coatings along the flat plate. It is found that disturbances are destabilized or stabilized when porous coating is located upstream or downstream of the synchronization point. For felt-metal porous coating, the destabilization of Mack's first mode is significant. The results suggest that an efficient way to stabilize hypersonic boundary-layer flows is to put porous coating downstream of the synchronization point. Finally, porous coating is used to stabilize the boundary layer disturbed by one blowing-suction actuator.

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Section: Increasing Of Environmental Disturbance Amplitudementioning

confidence: 99%

The stabilization of a hypersonic boundary layer using local sections of porous coating

Wang

Zhong

2012

Physics of Fluids

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“…Our previous results [5,4] show that for sufficiently large cone radius, nonlinear effects destabilise all linearly unstable viscous modes on a solid cone surface. At small values of the radius, corresponding to typical lengths of models tested in wind tunnels, it is the unstable mode with the lowest frequency that is destabilised by nonlinearity.…”

Section: Introductionmentioning

confidence: 90%

“…The values of a and r s depend on the physical parameters for the flow. The relationship between r s and a is discussed in [4] and [5]. The cone angle and Mach number will determine the shock angle θ s and the scaled radius a.…”

Section: Linear Stability Problemmentioning

confidence: 99%

“….. We can then show that A y ∼ iζ = |A y |e i3π/4 . Let us now consider equations (2)(3)(4)(5)(6)(7)(8) for large values of pore radius r p such that we can assume |ζ| ≫ 1. Now the large argument asymptotic expansions of the Bessel functions are J 0 ∼ 1/ √ πζ (cos ζ + sin ζ) and J 1 ∼ −1/ √ πζ (cos ζ + sin ζ) leading to G(ζ) ∼ −2/ζ.…”

Section: Phase Angle Of Admittancementioning

confidence: 99%

“…FA8655-08-1-3044 the effect of random microstructure porous models on the stability of the first mode was considered. The felt metal significantly destabilises the neutral modes and strongly amplifies the linearly unstable modes with the higher modes giving the largest growth rates [5]. Nonlinear effects in the presence of the felt metal coating stabilise these more dangerous higher modes over a larger range of a while destabilising the more slowly growing lower modes [4].…”

Section: Effect Of Porosity and Other Porous Modelsmentioning

confidence: 99%

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Effects of Passive Porous Walls on the First Mode of Hypersonic Boundary Layers Over a Sharp Cone

Stephen¹,

Michael²

2013

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Stabilization of hypersonic boundary layer by combining micro-blowing and a porous coating

Liu,

Zhao,

Wen

et al. 2023

Acta Mech

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Effects of Porous Walls on Hypersonic Boundary Layers over a Sharp Cone

Cited by 13 publications

References 29 publications

The stabilization of a hypersonic boundary layer using local sections of porous coating

The stabilization of a hypersonic boundary layer using local sections of porous coating

Effects of Passive Porous Walls on the First Mode of Hypersonic Boundary Layers Over a Sharp Cone

Stabilization of hypersonic boundary layer by combining micro-blowing and a porous coating

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