The interaction between shock waves and solid spheres arrays in a shock tube

Abstract

ABSTRACT:When a shock wave interacts with a group of solid spheres, non-linear aerodynamic behaviors come into effect. The complicated wave reflections such as the Mach reflection occur in the wave propagation process. The wave interactions with vortices behind each sphere's wake cause fluctuation in the pressure profiles of shock waves. This paper reports an experimental study for the aerodynamic processes involved in the interaction between shock waves and solid spheres. A schlieren photography was applied to visualize the various shock waves passing through solid spheres. Pressure measurements were performed along different downstream positions. The experiments were conducted in both rectangular and circular shock tubes. The data with respect to the effect of the sphere array, size, interval distance, incident Mach number, etc., on the shock wave attenuation were obtained.

Blast wave interaction with structures – An overview

“…This is because area reduction, as expected, inhibits the flow. This finding has since been confirmed repeatedly by several researchers, all of whom showed that the area ratio controls the flow downstream of an array of obstacles (Monti, 1970; Honghui and Yamamura, 2004; Epstein and Kudryavtsev, 2012).…”

“…This finding has since been confirmed repeatedly by several researchers, all of whom showed that the area ratio controls the flow downstream of an array of obstacles (Monti, 1970;Honghui and Yamamura, 2004;Epstein and Kudryavtsev, 2012). Honghui and Yamamura (2004) studied the passage of a shock wave (M s = 1.4-1.9) through spheres and cylinders arranged as rows of ball and stick (3 and 4 mm diameter) models. They observed a direct correspondence between the attenuation and the blockage introduced by each model.…”

“…Honghui and Yamamura (2004) studied the passage of a shock wave ( M s = 1.4–1.9) through spheres and cylinders arranged as rows of ball and stick (3 and 4 mm diameter) models. They observed a direct correspondence between the attenuation and the blockage introduced by each model.…”

Dynamics of cylindrical converging shock waves interacting with aerodynamic obstacle arrays

“…Nevertheless, during the reshaping process, non-negligible losses occur that reduce the shock strength, and therefore, care must be taken in identifying the suitable compromise between front stability and shock effectiveness. 12 The present work moves from the experimental study by Kjellander, Tillmark, and Apazidis, 13 who explored the interaction between cylindrical shocks and an array of eight aerodynamic obstacles in dilute air. Numerical simulations are performed here to explore a wider range of geometrical configurations and operational parameters, with the purpose of finding alternative, more efficient, solutions.…”

“…Diverse theoretical, numerical, and experimental investigations [8][9][10][11][12][13] demonstrate that if an array of obstacles is located along the shock path, the interaction between the shock wave and the obstacles can possibly result in the reshaping of the shock geometry into a more stable configuration. Nevertheless, during the reshaping process, non-negligible losses occur that reduce the shock strength, and therefore, care must be taken in identifying the suitable compromise between front stability and shock effectiveness.…”