mach stem


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Related to mach stem: Mach front

mach stem

The shock front formed by the fusion of the incident and reflected shock fronts from an explosion. The term is generally used with reference to a blast wave, propagated in the air, reflected at the surface of the Earth. In the ideal case, the mach stem is perpendicular to the reflecting surface and slightly convex (forward). Also called mach front.
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With increasing incidence angle of cylindrical wave in the propagation process, the length of Mach stem increases, and the angle of the reflection wave also increases because it is impossible to be strengthened in any radial direction of a wavefront due to the Mach stem.
Smaller inner tube diameter produces shorter shock waves forming the Mach stem and hence shorter formation time of the planar wave.
The curved shock in front of the flame is reflected from the bottom wall by forming a Mach stem. At t = 12.45 ms, autoignition occurs behind the Mach stem.