?Lateral? interaction of a supersonic underexpanded ideal-gas jet with surfaces of different shape

Ivanov, M. Ya.; Nazarov, V. P.

doi:10.1007/bf01020012

Cited by 2 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Jet impingement onto a surface has been studied extensively in normal [ Donaldson and Snedeker , ; Carling and Hunt , ; Lamont and Hunt , ; Lengrand et al , ] and oblique orientations [ Lamont and Hunt , ; Wu et al , ; Nakai et al , ; Crafton et al , ]. To the authors' knowledge, previous investigations of jet impingement on parallel plates are limited to acoustic studies [ Wlezien , ] or high‐vacuum systems [ Ivanov and Nazarov , ].…”

Section: Introduction: Geologic and Fluid Dynamic Backgroundmentioning

confidence: 99%

Flow of supersonic jets across flat plates: Implications for ground‐level flow from volcanic blasts

et al. 2014

View full text Add to dashboard Cite

We report on laboratory experiments examining the interaction of a jet from an overpressurized reservoir with a canonical ground surface to simulate lateral blasts at volcanoes such as the 1980 blast at Mount St. Helens. These benchmark experiments test the application of supersonic jet models to simulate the flow of volcanic jets over a lateral topography. The internal shock structure of the free jet is modified such that the Mach disk shock is elevated above the surface. In elevation view, the width of the shock is reduced in comparison with a free jet, while in map view the dimensions are comparable. The distance of the Mach disk shock from the vent is in good agreement with free jet data and can be predicted with existing theory. The internal shock structures can interact with and penetrate the boundary layer. In the shock‐boundary layer interaction, an oblique shock foot is present in the schlieren images and a distinctive ground signature is evident in surface measurements. The location of the oblique shock foot and the surface demarcation are closely correlated with the Mach disk shock location during reservoir depletion, and therefore, estimates of a ground signature in a zone devastated by a blast can be based on the calculated shock location from free jet theory. These experiments, combined with scaling arguments, suggest that the imprint of the Mach disk shock on the ground should be within the range of 4–9 km at Mount St. Helens depending on assumed reservoir pressure and vent dimensions.

show abstract

Section: Introduction: Geologic and Fluid Dynamic Backgroundmentioning

confidence: 99%

Flow of supersonic jets across flat plates: Implications for ground‐level flow from volcanic blasts

et al. 2014

View full text Add to dashboard Cite

show abstract

Calculation of the interaction of a supersonic jet with a flat obstacle inclined off the jet axis

Halynskyi¹

2020

Teh. Meh.

View full text Add to dashboard Cite

This paper presents results of a numerical solution of the model problem of the interaction of a plane supersonic jet with a semiinfinite flat plate inclinable off the jet axis. The paper is devoted to the study of the flow parameters in the jet flow field and the pressure distribution over the plate surface as a function of the plate inclination. The aim of the paper is to obtain the flow parameters in the jet flow field and the pressure distribution over the plate surface as a function of the plate inclination angle and front edge position. To obtain numerical results, marching algorithms in the inviscid gas and viscous layer approximation were used. At specified values of the supersonic underexpanded/overexpanded jet parameters, calculations were conducted in the plate inclination angle range of 0 to 20?. The position of the plate front edge was specified by two coordinates: a longitudinal and a transversal one, and in the parametric calculations the transversal coordinate was varied at a fixed longitudinal one. The cross-section at which the nonuniform jet field starts to interact with the plate was determined as a function of both the plate front edge position and the plate inclination. The numerical study showed the following: with increasing plate inclination angle, the oscillation frequencies of the flow parameters in the jet flow field and on the plate surface decrease, while their oscillation amplitudes increase, and the position of the maximum pressure point on the plate surface depends on the initial position of the plate front edge and may not coincide with the cross-section at which the jet–plate interaction starts. The results obtained may be used in qualitative estimation of the effect of different parameters in the jet flow field.

show abstract

?Lateral? interaction of a supersonic underexpanded ideal-gas jet with surfaces of different shape

Cited by 2 publications

References 4 publications

Flow of supersonic jets across flat plates: Implications for ground‐level flow from volcanic blasts

Flow of supersonic jets across flat plates: Implications for ground‐level flow from volcanic blasts

Calculation of the interaction of a supersonic jet with a flat obstacle inclined off the jet axis

Contact Info

Product

Resources

About