Comparison of weak-shock reflection factors for wedges, cylinders and blast waves
- Fraunhofer-Institut fuer Kurzzeitdynamik - Ernst-Mach-Institut (EMI), Freiburg im Breisgau (Germany)
- Lawrence Livermore National Lab., CA (United States)
Ernst Mach (1838--1916) was the first to discover an irregular reflection phenomenon of shock waves, as is well known in our community. In fact, this occurred in 1875 -- three years earlier than usually assumed in the literature. A facsimile of the paper in which he mentioned a special shock wave behavior is shown in a figure. However, it is correct that Mach gave the physical interpretation of this phenomenon in 1878. Since Mach's discovery of an irregular shock reflection pattern 117 years ago, new shock configurations have been discovered -- one of the most recent examples is the so-called [open quotes]von Neumann reflection[close quotes] for weak shocks as reported by Colella and Henderson in 1990. Due to active research efforts related to shock reflection, especially in the last two decades, we now have a relatively detailed understanding of reflection phenomena and of transition conditions from one reflection configuration to another. The purpose of this paper is to compare reflection factors for weak shocks from various surfaces, and to focus attention on some unsolved questions. Three different cases are considered: (1) square-wave planar shock reflection from wedges, (2) square-wave planar shock reflection from cylinders and (3) spherical blast wave reflection from a planar surface. The authors restrict themselves to weak shocks. Following Henderson's definition, shocks with a Mach number of M[sub 0] < 1.56 in air or with an overpressure of [Delta]p[sub I] < 25 psi (1.66 bar) under normal ambient conditions are called weak.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6383512
- Report Number(s):
- UCRL-JC-110564; CONF-9207202-1; ON: DE93014120; CNN: DNA-IACRO-92-824; DNA-001-91-C-0039
- Resource Relation:
- Conference: 10. Mach reflection symposium, Denver, CO (United States), 20-23 Jul 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
42 ENGINEERING
SHOCK WAVES
MATHEMATICAL MODELS
REFLECTION
SPACE DEPENDENCE
CONFIGURATION
DETONATION WAVES
GAS FLOW
IDEAL FLOW
POROSITY
PRESSURE DEPENDENCE
ROUGHNESS
STEADY FLOW
TEMPERATURE DEPENDENCE
FLUID FLOW
SURFACE PROPERTIES
661300* - Other Aspects of Physical Science- (1992-)
420400 - Engineering- Heat Transfer & Fluid Flow