Oblique shock

About: Oblique shock is a research topic. Over the lifetime, 6551 publications have been published within this topic receiving 119823 citations.

Experimental investigation on the shock-wave load attenuation by geometrical means

Abstract: The pressures and loads induced on the center of the end-wall of a shock tube by a shock wave that passes through different types of obstacles are investigated. Efforts have been made to understand the effect of the obstacle geometry on the load development. The experiments were conducted in a shock tube apparatus in which a modular test section was implemented. It is found that for a single-obstacle setup, the effect of the geometry becomes dominant when the blockage ratio (i.e., the ratio of the non-open area to the overall cross section) is large. It is also found that the attenuation effect is more pronounced for general geometries, which form diverging-like nozzle. In the case of multi-obstacles geometry, the same sensitivity to the blockage ratio as in the single-obstacle case is found. However, amplification or attenuation of the shock-wave load on the center of the end-wall of a shock tube is observed when the number of the obstacles is increased. This is due to different trapping effects of the shock wave between the obstacle and the end-wall.

Stability of a Mach configuration

Abstract: When the incident angle constructed by the incident shock and the surface of the wall is greater than a critical value, the regular shock reflection could not occur, and the Mach shock reflection will occur instead [1, 2, 3, 4, 5, 6, 7] In this chapter we are going to study the occurrence of Mach reflection and its structure Mach configuration is a structure of nonlinear waves, including three shocks starting from a point and a contact discontinuity Besides, we will also give a classification on this structure according to the characteristic feature of the flow field, and particularly study the stability of Mach configuration The main references are [2, 8]

Plasma wave turbulence associated with an interplanetary shock

Abstract: The present paper deals with interplanetary shocks, detected and analyzed to date, from the Helios 1 and 2 spacecraft in eccentric solar orbits. The plasma wave turbulence associated with the shock observed on March 30, 1976 is studied in detail. This event is of particular interest because it represents a clearly defined burst of turbulence against a quiet solar wind background both upstream and downstream of the shock. The shock itself is an oblique shock with upstream parameters characterized by a low Mach number, a low beta, and an abnormally large electron to ion temperature ratio. The types of plasma wave detected are discussed.

Concerning the Stability of Shock Waves

Abstract: In the study of the stabilitv of normal discontinuities in an arbitrarv medium with respect to perturbation of a wave type, D'iakov (Zhur. Eksptl'. i Teoret. Fiz. 27, perturbation from the shock grew with time, a region of stability when this perturbation is damped, and a peculiar region of ''spontaneous sound emission by the discontinuity'' in which the perturbation has the form of an undamped travelling wave. This last region is deflned in the present article. (J.S.R.)