1. Experimental and numerical investigations of a shock wave propagation through a bifurcation
- Author
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D. Leriche, L. Biamino, Eric Daniel, Lazhar Houas, Jacques Massoni, A. Marty, Georges Jourdan, Institut Nanosciences et Cryogénie (INAC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut universitaire des systèmes thermiques industriels (IUSTI), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), DGA TN F, 1) DGA TN F-29200 Brest, Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique des Systèmes et des Procédés (LMSP), Centre National de la Recherche Scientifique (CNRS), DGA Techniques Navales, DGA Techniques navales, ANR-11-IDEX-0001,Amidex,INITIATIVE D'EXCELLENCE AIX MARSEILLE UNIVERSITE(2011), and HOUAS, Lazhar
- Subjects
Shock wave ,Astrophysics::High Energy Astrophysical Phenomena ,General Physics and Astronomy ,Reflection ,02 engineering and technology ,01 natural sciences ,[PHYS] Physics [physics] ,010305 fluids & plasmas ,Physics::Fluid Dynamics ,symbols.namesake ,0203 mechanical engineering ,0103 physical sciences ,Duct (flow) ,Shock tube ,Bifurcation ,Physics ,[PHYS]Physics [physics] ,020301 aerospace & aeronautics ,Atmospheric pressure ,[SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment ,Mechanical Engineering ,Attenuation ,Shock wave propagation ,Mechanics ,[PHYS.MECA]Physics [physics]/Mechanics [physics] ,Mach number ,Shock tube environment ,Reflection (physics) ,symbols ,[PHYS.MECA] Physics [physics]/Mechanics [physics] - Abstract
International audience; The propagation of a planar shock wave through a split channel is both experimentally and numerically studied. Experiments were conducted in a square cross-section shock tube having a main channel which splits into two symmetric secondary channels, for three different shock wave Mach numbers ranging from about 1.1 to 1.7. High-speed schlieren visualizations were used along with pressure measurements to analyze the main physical mechanisms that govern shock wave diffraction. It is shown that the flow behind the transmitted shock wave through the bifurcation resulted in a highly two dimensional unsteady and non-uniform flow accompanied with significant pressure loss. In parallel , numerical simulations using a personal code based on the solution of the Euler equations with a second-order Go-dunov scheme confirmed the experimental results with a good agreement. Finally, a parametric study was carried out using numerical analysis where the angular displacement of the two channels that define the bifurcation was changed from 90 • ,45 • , 20 • and 0 •. We found that the angular displacement does not significantly affect the overpressure experience in either of the two channels and that the area of the expansion region is the important variable affecting overpressure; the effect being, in the present case, a decrease of almost one half.
- Published
- 2018
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