  Regular reflection (RR) to Mach reflection(MR) transitions (RR-MR) on long
wedges in steady supersonic flows have been well studied and documented.
However, in a short wedge where the wedge length is small, the transition
prediction becomes really challenging owing to the interaction of the expansion
fan emanating from the trailing edge of the wedge with the incident shock and
the triple/reflection point. The extent of this interaction depends on the
distance between the wedge trailing edge and the symmetry line (Ht). This
distance is a geometric combination of the distance of the wedge leading edge
from the symmetry line (H), the wedge angle, and the wedge length (w). In the
present work, the RR-MR transitions have been studied using analytical and
computational methods, and the transition lines are plotted for various Mach
numbers and wedge lengths. The transition criterion strongly depends on the
wedge length, which can be so adjusted to eliminate the RR-MR transitions till
the wedge angle reaches the no-reflection domain.
