Abstract
A conventional Swirl jet is generated by applying a tangential force in the fluid injected to the nozzle. For this reason, the nozzle structure is complicated and the nozzle has a difficulty to manufacture. According to recent researches, it is known that a unique nozzle unit with an annular slit and conical cylinder can generate a spiral flow which is a kind of swirl flow without a tangential force in the jet. Pressurized fluid from the reservoir is supplied to an annular chamber and then injected into the convergent nozzle through the annular slit. In this paper, the effect Of the ratio of air pressure in the buffer to stagnant atmospheric pressure on the spiral flow field is investigated numerically. As a result, axial and tangential velocities increased with an increase of the pressure ratio. Furthermore, in case of the high-pressure ratio, the variation in axial and tangential velocities for a fully developed flow was caused by relatively high flow instability in the buffer area.
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