Topic
Oblique shock
About: Oblique shock is a research topic. Over the lifetime, 6551 publications have been published within this topic receiving 119823 citations.
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TL;DR: In this paper, the authors present the results of an investigation on the motion of a spherical particle in a shock tube flow using different optical methods and performing experiments in two different shock tubes.
Abstract: The paper presents the results of an investigation on the motion of a spherical particle in a shock tube flow A shock tube facility was used for studying the acceleration of a sphere by an incident shock wave Using different optical methods and performing experiments in two different shock tubes, the trajectory and velocity of a spherical particle were measured Based upon these results and simple one-dimensional calculations, the drag coefficient of a sphere and shading effect of sphere interaction with a shock tube flow were studied
41 citations
TL;DR: In this article, a model for a strong plasma shock wave with a structure determined by ion wave instabilities has been developed and the magnetic field structure of the shock wave is further investigated and found to have many features in agreement with satellite observations of the earth's bow shock.
Abstract: A model for a strong plasma shock wave with a structure determined by ion wave instabilities has been developed. The magnetic field structure of the shock wave is further investigated and found to have many features in agreement with satellite observations of the earth's bow shock. A significant test for this model would be to observe the plasma density to jump through the bow shock on a length scale that is sometimes less than the thickness LB of the shock jump in the average magnetic field. It is also pointed out that the earth's bow shock may have a variable structure ranging from a thin ion-wave shock to relatively thick hydromagnetic shocks as conditions in the solar wind vary.
41 citations
TL;DR: In this article, the fundamental ideas of particle acceleration in plasma shocks with emphasis on those features that are required to produce the universal power-law spectrum are discussed and compared with the more familiar second-order or stochastic acceleration.
Abstract: We discuss the fundamental ideas of particle acceleration in plasma shocks with emphasis on those features that are required to produce the 'universal' power-law spectrum. We compare shock acceleration with the more familiar second-order or stochastic acceleration and see that they are not too different in many respects. We discuss the features of shock acceleration that make it appealing and some of its problems as well.
41 citations
Patent•
12 Nov 2003
TL;DR: In this article, a gas is modified by emitting energy to form an extended path in the gas; heating gas along the path to form a volume of heated gas expanding outwardly from the path; and directing a path.
Abstract: A shock wave in a gas is modified by emitting energy to form an extended path in the gas; heating gas along the path to form a volume of heated gas expanding outwardly from the path; and directing a path. The volume of heated gas passes through the shock wave and modifies the shock wave. This eliminates or reduces a pressure difference between gas on opposite sides of the shock wave. Electromagnetic, microwaves and/or electric discharge can be used to heat the gas along the path. This application has uses in reducing the drag on a body passing through the gas, noise reduction, controlling amount of gas into a propulsion system, and steering a body through the gas. An apparatus is also disclosed.
41 citations
TL;DR: In this paper, the authors studied the reflection of strong oblique shock waves at turbulent boundary layers and derived critical incident shock deflection angles at which the shock pattern may/must become irregular.
Abstract: The reflection of strong oblique shock waves at turbulent boundary layers is studied numerically and analytically. A particular emphasis is put on the transition between regular shock-wave/boundary-layer interaction (SWBLI) and Mach reflection (irregular SWBLI). The classical two- and three-shock theory and a generalised form of the free interaction theory are used for the analysis of well-resolved large-eddy simulations (LES) and for the derivation of stability criteria. We found that at a critical deflection angle across the incident shock wave, the perturbations related to the turbulent boundary layer cause bi-directional transition processes between regular and irregular shock patterns for a free-stream Mach number of . Computational results show that the mean deflection angle across the separation shock is decoupled from the incident shock wave and can be accurately modelled by the generalised free interaction theory. On the basis of these observations, and the von Neumann and detachment criteria for the asymmetric intersection of shock waves, we derive the critical incident shock deflection angles at which the shock pattern may/must become irregular. Numerical data for a free-stream Mach number of confirm the existence of the dual-solution domain predicted by theory.
41 citations