Abstract
Existence of Mach cone and helical vortical structure in the helical oscillation mode of underexpanded circular jet was confirmed by using schlieren instantaneous photographs and drawings of envelopes of the Mach cones by the superposition of spherical sound waves radiated from two moving sound sources about the jet axis at a supersonic speed. The enveloes of a Mach cone are observed as a V-shaped pattern composed of a pair of clear fine lines starting from a prominent point, which rotates about the jet axis. The helical vortical structure is observed as bright pattern of the gathering of the tiny specks around the jet. It always apperars to overlap on the envelopes of the moving Mach cones.
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