On aerodynamic characteristics of rarefied hypersonic flows over variable eccentricity elliptical cavities

Guo, Gaofeng; Luo, Qin; Wu, Jinwu

doi:10.1016/j.ast.2023.108160

Cited by 3 publications

(1 citation statement)

References 49 publications

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“…The 3D structure of the flow was pronounced in asymmetric regimes with large yaw angles in which there was a formation of a trailing vortex. A numerical study was conducted for rarefied hypersonic flows (M = 10-30; altitude = 60-90 km) over elliptical cavities with variable eccentricities (ε = 0-0.92) [18]. Compared with a cylindrical cavity, an elliptical cavity has slightly smaller peak pressure on the downstream sidewall but much smaller values on the cavity floor.…”

Section: Introductionmentioning

confidence: 99%

Global Surface Pressure Pattern for a Compressible Elliptical Cavity Flow Using Pressure-Sensitive Paint

Huang,

Chung

2024

Aerospace

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The flow field in a cavity depends on the properties of the upstream boundary layer and the cavity geometry. Comprehensive studies for rectangular cavities have been conducted. This experimental study determines the global surface pressure pattern for elliptical cavities (eccentricities of 0, 0.66 and 0.87) in a naturally developed turbulent boundary layer using pressure-sensitive paint. The ratio between the length (major axis) and the depth is 4.43–21.5, and the freestream Mach number is 0.83. The mean surface pressure distribution of an elliptical cavity resembles that of a rectangular cavity. A change in the value of eccentricity (wall curvature) affects the region for an adverse pressure gradient in an open cavity, an extension of the plateau in a transitional–closed cavity and flow expansion near the front and rear edges. The boundaries between an open, transitional and closed cavities vary.

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Section: Introductionmentioning

confidence: 99%

Global Surface Pressure Pattern for a Compressible Elliptical Cavity Flow Using Pressure-Sensitive Paint

Huang,

Chung

2024

Aerospace

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Numerical investigation on flow and aerothermal characteristics of rarefied hypersonic flows over slender cavities

Guo,

Luo,

2024

Aerospace Science and Technology

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Numerical study on drag and heat flux reduction induced by a counterflowing jet for rarefied hypersonic flow over a blunt body

Guo,

Luo,

2024

Physics of Fluids

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This paper focuses on the drag and heat flux reduction induced by a counterflowing jet located on the leading edge of the blunt body head in rarefied hypersonic flows using the direct simulation Monte Carlo method. Flow structures in the flowfield, such as detached shock wave, Mach disk, contact surface, jet layer, and recompression shock wave, are all weakened gradually with the increase in the freestream altitude, and they eventually disappear at the altitude of 90 km. The increase in the jet pressure provides a great drag reduction by up to 53% when it increases from 800 to 1600 Pa, but the proportion of drag on the blunt body head to the total drag is only affected slightly by the jet pressure. A noteworthy finding is that further increasing jet pressure almost have no effect on heat flux variation when it is larger than 1200 Pa. On the whole, jet temperature has a quite weak influence on both flow structures and drag, while heat flux on the blunt body head is closely related to jet temperature. The results suggest that jet temperature should vary with that of blunt body surface, and moreover, the optimal jet temperature should be moderately lower than the wall surface temperature. In addition, increasing freestream altitude can provide excellent performance of drag reduction, but it causes non-monotonic variation of heat flux. In view of this, it is worth noting that heat flux on the blunt body head actually increases with altitude when the blunt body is in a severely rarefied atmospheric environment, such as the altitude H > 70 km.

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On aerodynamic characteristics of rarefied hypersonic flows over variable eccentricity elliptical cavities

Cited by 3 publications

References 49 publications

Global Surface Pressure Pattern for a Compressible Elliptical Cavity Flow Using Pressure-Sensitive Paint

Global Surface Pressure Pattern for a Compressible Elliptical Cavity Flow Using Pressure-Sensitive Paint

Numerical investigation on flow and aerothermal characteristics of rarefied hypersonic flows over slender cavities

Numerical study on drag and heat flux reduction induced by a counterflowing jet for rarefied hypersonic flow over a blunt body

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