Smoke pipe diffusers in the shape of the roller shell with a curvilinear cone

It is shown that the general rules of the diffuser generatrix shape impact in its line work can be also applied in the process of estimating diffusers' activity at the smoke pipe outlet. Numerical studies of inner and outer aerodynamics of diffusers of different relative length and generatrix shape were carried out. Materials consumption and production effectiveness of glass-fibre-reinforced plastic curvilinear diffusers are considered and their advantage over metal diffuser is shown.