The Effect of Reynolds Number on the Hypersonic Flow around Faceted Shapes

Rees, Thomas W.; Bruce, Paul J.; Merrifield, J. A.

doi:10.2514/6.2018-5197

Cited by 1 publication

(9 citation statements)

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“…Nevertheless, the authors suggested that these heat fluxes, and the separation bubble formation, are highly dependent on the Reynolds number. A 2D CFD study investigating the effect of Reynolds number on the hypersonic flow around faceted shapes confirmed that the formation of such a separation bubble was dependent on Reynolds number (Rees et al 2018), and that the presence of a separation could significantly decrease local heating rates. This reduction in local heating is especially significant in the context of satellite demise as it will result in an increased casualty risk.…”

Section: Introductionmentioning

confidence: 89%

“…The third, most sophisticated and robust method is to solve an inverse heat condution problem (IHCP). Typically, inverse problems involve the calculation of an object's boundary conditions using knowledge of some internal conditions (Ozisik and Orlande 2000). In the context of measuring heat fluxes using IRT, the heat flux to the surface is estimated by considering the evolution of the surface temperature.…”

Section: Hypersonic Heat Flux Calculationmentioning

confidence: 99%

“…IHCPs, while offering maximum flexibility in heat flux calculations (Avallone et al 2015) also have their disadvantages, namely their significant complexity and computational cost. In addition to this, they are ill-posed problems as their solutions are not unique, meaning their solutions are extremely sensitive to small changes in input data (Ozisik and Orlande 2000).…”

Section: Hypersonic Heat Flux Calculationmentioning

confidence: 99%

“…In the remainder of this section, we briefly describe a method of solving the IHCP on the cuboidal domain by the conjugate gradient method with adjoint and sensitivity problems, a commonly used IHCP solution methodology (Huang and Wang 1999;Imbriale 2013). In the summary below, we follow the derivation of Ozisik and Orlande (2000).…”

Section: Hypersonic Heat Flux Calculationmentioning

confidence: 99%

“…The use of IRT is advantageous due to the fact that it is a non-intrusive measurement technique, with a high spatial resolution, low response time, and high sensitivity. In addition to the IRT measurements, the flow structure around the cube is imaged with schlieren photography to further study the separation formation described in Matthews and Eaves (1967), Rees et al (2018), and Seltner et al (2019).…”

Section: Introductionmentioning

confidence: 99%

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Experimental characterization of the hypersonic flow around a cuboid

et al. 2020

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Understanding the hypersonic flow around faceted shapes is important in the context of the fragmentation and demise of satellites undergoing uncontrolled atmospheric entry. To better understand the physics of such flows, as well as the satellite demise process, we perform an experimental study of the Mach 5 flow around a cuboid geometry in the University of Manchester High SuperSonic Tunnel. Heat fluxes are measured using infrared thermography and a 3D inverse heat conduction solution, and flow features are imaged using schlieren photography. Measurements are taken at a range of Reynolds numbers from 40.0 × 10 3 to 549 × 10 3. The schlieren results suggest the presence of a separation bubble at the windward edge of the cube at high Reynolds numbers. High heat fluxes are observed near corners and edges, which are caused by boundary-layer thinning. Additionally, on the side (off-stagnation) faces of the cube, we observe wedge-shaped regions of high heat flux emanating from the windward corners of the cube. We attribute these to vortical structures being generated by the strong expansion around the cube's corners. We also observe that the stagnation point of the cube is off-centre of the windward face, which we propose is due to sting flex under aerodynamic loading. Finally, we propose a simple method of calculating the stagnation point heat flux to a cube, as well as relations which can be used to predict hypersonic heat fluxes to cuboid geometries such as satellites during atmospheric re-entry.

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Section: Introductionmentioning

confidence: 89%

Section: Hypersonic Heat Flux Calculationmentioning

confidence: 99%