Cross-hatching - A coupling of gas dynamics with the ablation process

Larson, H. K.; Mateer, G. G.

doi:10.2514/6.1968-670

Cited by 25 publications

(18 citation statements)

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“…4~8 Larson and Mateer noted the development of cross-hatching on camphor models into a pattern that resembled the regmaglypt pattern observed on many meteorites. 4 The same phenomenon is confirmed by the wind-tunnel tests reported in this paper. Canning, Wilkins, and Tauber have reported on turbulence wedges, streamwise grooves, and crosshatched patterns from their ballistic range and wind-tunnel tests and proposed a physical flow model to explain these patterns.…”

Section: Nomenclaturesupporting

confidence: 87%

“…Larson and Mateer noted the effect of steel tips. 4 Tobak suggested vortices as the origin of cross-hatching. 16 During the planning of these tests, because of the presumed phenomenology requirement for either transitional or turbulent flow, it was suggested that ablation in the presence of boundary layer transition might be essential to the formation of ablation-surface patterns; consequently, a partial camphor ablation model (Fig.…”

Section: Radial Groovesmentioning

confidence: 98%

“…8) <f > = ablation surface pattern half angle o> = spin rate Subscripts co = freestream conditions e = boundary-layer edge L = local o = initial r = recovery conditions T = total or stagnation conditions w = wall conditions Introduction I NTRIGUING ablation patterns on meteorites and tektites have been noted and studied for decades. 1 " 4 Chapman and Larson have studied the ablation patterns of tektites and have produced the characteristic ring-wave flow ridges in the laboratory. 2 ' 3 Examples of both streamwise grooves and regmaglyptt ablation on meteorites are shown in the photographs ofRef.…”

Section: Nomenclaturementioning

confidence: 99%

“…Larson and Mateer reported similar results for camphor. 4 The two highest pressure tests, Figures 6 and 7, were conducted on opaque models which resulted from a poor vacuum during pressing. This is not believed to have had an appreciable effect on the resulting ablation pattern.…”

Section: Camphormentioning

confidence: 99%

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Experimental Studies of Ablation Surface Patterns and Resulting Roll Torques

Williams

1971

AIAA Journal

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Because of the interest in differential ablation patterns and their implications for the roll characteristics of small hypervelocity vehicles, conical models covered with various lowtemperature ablative materials were tested in a hypersonic wind tunnel. A unique feature of these tests was the direct measurement of roll torques during the actual ablation process. These tests were conducted at Mach 6 on sharp-nosed models, mostly subliming camphor and special Korotherm. The scale of cross-hatching is shown to decrease with increasing pressure for camphor. The ablation pattern of melting-vaporizing naphthalene is similar to that of subliming camphor. The cross-hatched pattern of subliming Korotherm in the wind tunnel is found to be similar to that of silica phenolic in flight. Some rolling moment coefficient data are presented. NomenclatureA -ablation age = Ci = rolling-moment coefficient = rolling moment /qSd d = model base diameter M = Mach number p = pressure q -dynamic pressure, -g-pV 2 S = model base area T = temperature t = time W = thickness of material ablated away a =» angle of attack 5 -boundary-layer thickness 6 = cone half angle X = ablation surface pattern length (Fig. 8) = ablation surface pattern half angle o> = spin rate Subscripts co = freestream conditions e = boundary-layer edge L = local o = initial r = recovery conditions T = total or stagnation conditions w = wall conditions

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Section: Nomenclaturesupporting

confidence: 87%

Section: Radial Groovesmentioning

confidence: 98%

Section: Nomenclaturementioning

confidence: 99%

Section: Camphormentioning

confidence: 99%

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Experimental Studies of Ablation Surface Patterns and Resulting Roll Torques

Williams

1971

AIAA Journal

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“…4 Moreover, while there is no direct application to unsteady phenomena such as panel flutter and hydrodynamic stability of liquid surfaces 5 the results nevertheless provide valuable insight to the effects of nonuniform boundary layer flow in these applications. Since in practice the boundary layer is often turbulent, studies of the problem have concentrated in this case.…”

Section: Introductionmentioning

confidence: 97%

Subsonic and Supersonic Boundary-Layer Flow past a Wavy Wall

Inger

Williams

1972

AIAA Journal

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Steady two-dimensional compressible turbulent boundary-layer flow past a slightly wavy wall is studied both analytically and experimentally in the Mach number range 0.8 ^ M e ^ 1.8 at unit Reynolds numbers on the order of 10 6 per inch. The measured and predicted wall pressure distributions are in good agreement and indicate that the nonuniform flow in the boundary layer can produce essentially a subsonic type of wall pressure signature (p max in valleys) in the presence of moderately supersonic inviscid flows. An interesting cusping of the pressure is also observed in the transonic regime. Measurements of the wall temperature perturbations are also made; the results agree with theory in showing a strong correlation between 7^a x and P max .

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On the formation of regmaglypts on meteorites

Lin

Qun

1987

Fluid Dyn. Res.

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General and characteristic features of remaglypts on the fusion crust of various kinds of meteorites are summarized and analyzed. Laboratory simulating experiments were carried out on models of different geometries and made of different materials. Important ablation patterns, their sequence of appearance, and their detailed surface striations were discovered. The underlying physical mechanisms and the now model are postulated for the occurrance and formation of regmaglypts on meteorites.

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Cross-hatching - A coupling of gas dynamics with the ablation process

Cited by 25 publications

References 0 publications

Experimental Studies of Ablation Surface Patterns and Resulting Roll Torques

Experimental Studies of Ablation Surface Patterns and Resulting Roll Torques

Subsonic and Supersonic Boundary-Layer Flow past a Wavy Wall

On the formation of regmaglypts on meteorites

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