Development of a new empirical formula for prediction of triple point path

Xiao, Weifang; Andrae, Matthias; Gebbeken, Norbert

doi:10.1007/s00193-020-00968-7

Cited by 12 publications

(4 citation statements)

References 7 publications

(18 reference statements)

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“…Nevertheless, among the different models studied [12][13][14][15][16], only the model of Kinney and Graham [12] was considered relevant because it does not depend on the explosive charge mass, but only on the Mach number of the incident shock wave. In the literature, some models [22][23][24][25][26] suggest an approximation of the Mach stem evolution following an explosion above the ground. This configuration is also called height of burst (HOB).…”

Section: Quantitative Measurements By Visualizationmentioning

confidence: 99%

“…Therefore, it is inappropriate to use models which depend on the explosive charge mass. Among the different models studied [22][23][24][25][26], only the model of Kinney and Graham [22] was considered relevant because it depends only on the Mach number of the incident shock wave. An illustration of the formation of the Mach stem in the case of an explosion above the ground, the HOB configuration, is given in Figure 16.…”

Section: Quantitative Measurements By Visualizationmentioning

confidence: 99%

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Analysis of Shock Wave Interaction with an Obstacle by Coupling Pressure Measurements and Visualization

Gautier

Sochet

Courtiaud

2022

Sensors

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Small-scale experiments are a good means of carrying out explosion and shock wave measurements. Commonly, the shock wave is tracked thanks to pressure sensors and sometimes with a high-speed camera. In the present study, these methods were used to analyze the interaction of a shock wave with an obstacle of simple geometry. The primary aim of the study was to demonstrate the need to correlate these different methods in order to analyze certain phenomena related to the three-dimensional interaction of a shock wave with an object. The correlation between the overpressure and the visualization made it possible to carry out a complex analysis. The visualization was carried out simultaneously on two planes, from the front and top views, thanks to the optical setup. Shock wave characteristics were taken at ground level downstream of the obstacle with pressure gauges. The correlation of the images obtained allows the identification of the waves on the profile and their contribution in intensity.

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Section: Quantitative Measurements By Visualizationmentioning

confidence: 99%

Section: Quantitative Measurements By Visualizationmentioning

confidence: 99%

Analysis of Shock Wave Interaction with an Obstacle by Coupling Pressure Measurements and Visualization

Gautier

Sochet

Courtiaud

2022

Sensors

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“…As the wave travels along the circular surface, the regular reflection configuration persists until the interaction angle of the wave with the surface decreases and reaches a certain limit, leading to a Mach reflection. Such a configuration gives rise to a new composite shock front called a Mach shock, comprising the reflected, Mach, and incident waves intersecting at a point called the triple point (Xiao et al, 2020). As this wave progresses, at some point on the curved surface of the cylinder, the triple point separates and propagates further downstream.…”

Section: Literature Reviewmentioning

confidence: 99%

Mitigation of blast loading through blast–obstacle interaction

Alshammari

Isaac

Clarke

et al. 2022

International Journal of Protective Structures

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Obstructing the passage of blast waves is an effective method of mitigating blast pressures downstream of the obstacle. To this end, the interaction between a blast wave and a simplified structural shape, such as a cylinder, has been widely investigated to understand the complex flow pattern that ensues around the obstacle. The patterns include the interference zones of the incident wave, the diffracted wave, and other secondary waves in the downstream region. Such zones are responsible for causing significant modifications to the blast wave parameters. This research aims to identify and study the factors that serve to mitigate the resulting blast loads downstream of a cylindrical obstacle – both on the ground, and on a rigid wall target that the obstacle is aiming to protect. Inputs from this numerical study are also used to develop a fast-running predictive method based on an artificial neural network (ANN) model. It was found that the size of the cylinder, the strength of the blast wave, the position of the cylindrical obstruction, and the target length, all have remarkable effects on the development of the complex flow-field downstream, and on the impulse mitigation on a reflective target. A number of key mitigation mechanisms are identified, namely shadowing and interference, and their origins and significance are discussed. An ANN model trained using scaled input parameters could successfully predict impulse values on such a reflective target. Using this model to predict the response of previously unseen configurations (for the ANN) gave excellent correlation, thereby demonstrating the high fidelity of this fast-running tool, and its ability to predict the effectiveness of various wave-cylinder interactions in mitigating blast loading.

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“…Nach der Reflexion am Boden überlagern sich die einfallenden und reflektierten Wellen und der sog. Machstamm wird gebildet [2, 4, 5].…”

Section: Versuchsdurchführungunclassified

Untersuchung der Schutzwirkung von auf Gabionenwänden montierten Leitblechen gegen Explosionen

2020

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In diesem Aufsatz werden experimentelle und numerische Untersuchungen zur Minderung von Explosionslasten auf Gebäude und Menschen durch verschiedene Konfigurationen einer Schutzwand vorgestellt. Die Wandkonstruktion besteht aus einer Gabionenwand mit einem aufgesetzten Leitblech, das mit unterschiedlichen Neigungswinkeln angeordnet wird. Für jede Testkonfiguration wurden drei Versuche durchgeführt. Numerische Modelle wurden entwickelt und anhand der Versuchsdaten validiert. Aus Kosten‐ und Platzgründen wurden Schutzwände mit einer geringen Breite von 2 m in den Versuchen untersucht. Hinter der Wand kommt es hierdurch zur Überlagerung der vertikal über die Oberseite der Schutzwand strömenden Schockwelle mit der seitlich um die Wand strömenden Schockwelle. Neben den in den Versuchen eingesetzten kurzen Wänden wurden lange Wände numerisch simuliert, wie sie in der Praxis benötigt werden. Die numerischen Untersuchungen an der langen Umfassungswand zeigten, dass Leitbleche die Intensität der Schockwelle deutlich reduzieren können. Bezüglich der Schutzwirkung erweist sich die Testkonfiguration mit einer Anordnung des Leitblechs von 45° in Richtung des Explosionsursprungs als wirkungsvollste Maßnahme. Im Vergleich zum Freifeldszenario wird in den untersuchten Bereichen eine Überdruckreduktion (Impulsreduktion) von 55,0 % bis 86,0 % (von 45,7 % bis 63,8 %) erreicht.

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Development of a new empirical formula for prediction of triple point path

Cited by 12 publications

References 7 publications

Analysis of Shock Wave Interaction with an Obstacle by Coupling Pressure Measurements and Visualization

Analysis of Shock Wave Interaction with an Obstacle by Coupling Pressure Measurements and Visualization

Mitigation of blast loading through blast–obstacle interaction

Untersuchung der Schutzwirkung von auf Gabionenwänden montierten Leitblechen gegen Explosionen

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