Aerodynamics of Vortex Apparatuses

Clearing of Industrial Gas Emissions Theory, Calculation, and Practice 

The formation of the turbulent twirled stream essentially differs from the forward. Under the influence of a centrifugal force in the twirled stream, there are pressure gradient on radius, the return currents, the raised speeds at a wall, non-linearity of a profile of tangential stresses, etc. In turn, these phenomena make strong impact on regularity of motion of drops of a liquid in a deduster and character of a current in a boundary layer on a phase boundary gas—a liquid, i.e., define both separation efficiency, and a water resistance, and a criticality of work of dedusters [1-9], 

On character of distribution of axial speed, the twirled streams are classified as follows Frolov (1978)  

So the air swirlers, which design features strain velocity profiles, for example, are known in such a manner that, despite a considerable initial twisting of a stream, in axial area, there is no reverse flow or there are rather weak return currents. Besides, at small blade twists chances of reception of undershooting of axial making speed [10-17], 

Researches show (Kutepov, 1977 and Uollis, 1972) that velocity profiles of a gas stream for geometrically similar air swirlers automodeling to diameter the rotary connection and to a gas rate. In the installed stream gate out an axial zone of quasifirm twirl and a peripheral zone of potential twirl with the matching approached profiles (Kutepov, 1977)  

---