Hypersonic interference heating on cones with short three-dimensional protuberances

Kumar, C. S.; Reddy, K. P. J.

doi:10.1016/j.expthermflusci.2014.02.013

Cited by 3 publications

(4 citation statements)

References 17 publications

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“…In the former, the hottest point generally appears to the side of the protuberance, whereas in the latter, the hot spot is exhibited within the separated region, immediately upstream of the protuberance, close to its foot. All experiments in the parametric study mentioned above, [20][21][22] as well as those presented in this paper fell under the supercritical category where the hottest spot in formed immediately ahead of the protrusion.…”

Section: A Backgroundmentioning

confidence: 97%

“…On the flat plate, protuberances with h = 4, 5, 6, and 7 mm and α = 60 • , 90 • , and 120 • ; and on the cone, protrusions with h = 3, 4, 5, and 6 mm and α = 60 • , 90 • , and 120 • were studied. [20][21][22] Estruch et al, 18,19 in their work on interference heating on flat plates, categorized the interference interactions into two, (a) subcritical and (b) supercritical. For a given height of protuberance, there exists a critical lip deflection angle below which the interactions are subcritical, where no substantial recirculation zone is generated upstream of the protrusion.…”

Section: A Backgroundmentioning

confidence: 98%

“…Using the measurements made in the experiments with the variation of flow conditions and protuberance geometry, empirical correlations were generated to predict the magnitude of hot spot heat [20][21][22] In the case of the flat plate, the data were used to formulate a single empirical correlation based on modified Stanton number 33 as given below…”

Section: A Backgroundmentioning

confidence: 99%

“…Experimental investigations were previously conducted by the same authors of this paper to extend the validity of empirical correlations 18,19 to flow stagnation enthalpies of up to 6 MJ/kg on both flat plates 20,21 and cones. 22 They revealed that the existing empirical correlations were unable to predict the hot spot heat flux in the interaction region accurately. Therefore, new correlations have been proposed which work better for the range of test conditions used on those experiments.…”

Section: Introductionmentioning

confidence: 98%

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Investigation of the separated region ahead of three-dimensional protuberances on plates and cones in hypersonic flows with laminar boundary layers

2014

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Heat transfer rate and pressure measurements were made upstream of surface protuberances on a flat plate and a sharp cone subjected to hypersonic flow in a conventional shock tunnel. Heat flux was measured using platinum thin-film sensors deposited on macor substrate and the pressure measurements were made using fast acting piezoelectric sensors. A distinctive hot spot with highest heat flux was obtained near the foot of the protuberance due to heavy vortex activity in the recirculating region. Schlieren flow visualization was used to capture the shock structures and the separation distance ahead of the protrusions was quantitatively measured for varying protuberance heights. A computational analysis was conducted on the flat plate model using commercial computational fluid dynamics software and the obtained trends of heat flux and pressure were compared with the experimental observation. Experiments were also conducted by physically disturbing the laminar boundary layer to check its effect on the magnitude of the hot spot heat flux. In addition to air, argon was also used as test gas so that the Reynolds number can be varied. C 2014 AIP Publishing LLC. [http://dx.

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Section: A Backgroundmentioning

confidence: 97%