| 摘要 |
A burner nozzle projects a mixture of fuel oil and air into a burner tube fitted with an open ended flame retention head having the general configuration of a frustum of a cone the small end of which faces the nozzle and the large end of which abuts the interior wall of the burner tube. The zone on the nozzle side and around the circumference of the conical flame retention head is supplied with air under pressure. Slots each having an outwardly inclined vane adjacent one of its margins extend longitudinally of the head and open at both the periphery and the small end of the head to direct air from the pressure zone into an axially swirling pattern of motion within the head. Additional openings of circular configuration are disposed in a ring about the conical head in the vicinity of but spaced from its large end, and the slots terminate at individual ones of these circular openings. The openings provide additional passages for directing air from the pressurized zone toward the axis of the head. |
