Abstract: A swirler includes a tubular body having a row of secondary radial swirl vanes. A tubular ferrule adjoins the body at the secondary vanes, and includes a row of primary swirl vanes. The primary vanes are disposed axially obliquely to the secondary vanes, with a common annular inlet facing radially outwardly for swirling air radially inwardly therefrom with axial momentum into the tubular body.

Abstract: A swirler includes a tubular body having a row of secondary radial swirl vanes. A tubular ferrule adjoins the body at the secondary vanes, and includes a row of primary swirl vanes. The primary vanes are disposed axially obliquely to the secondary vanes, with a common annular inlet facing radially outwardly for swirling air radially inwardly therefrom with axial momentum into the tubular body.

Abstract: A method for determining the appropriate hole parameters to achieve the desired airflow in a swirler with as-cast air jet holes includes the steps of determining the desired airflow through the holes and selecting a hole angle for the holes. Next, the ratio of the hole exit area to the hole inlet area is calculated based on the desired airflow and the selected hole angle using a regression equation. Then a value is determined for either of the hole exit area or the hole inlet area, and the other area is calculated from the known ratio. Once the hole angle, hole exit area and hole inlet area have been determined, then a swirler can be cast with as-cast holes using these hole parameters.

Abstract: In a combustor carburetor device having a secondary swirler which axially introduces airflow between the venturi and a splashplate, a cylindrical sleeve is inserted between the venturi and the splashplate to axially extend the air outer flow path. The cavity defined by the axial extension and the splashplate is then purged by a source of air such that the combination prevents the flow of fuel from the venturi to the surface of the splashplate to thereby reduce emissions during engine idle operation. At the downstream end of the cylindrical sleeve is attached a frustoconical portion which allows controlled dispersion of the fuel/air mixture for resultant improved ignition characteristics.

Abstract: A low pressure fuel stream is injected into a carburetor by way of a fuel tube injector combination having an insulating air space provided between the internal flow path structure and the outer surface of the combination which is exposed to relatively high temperatures. The fluid stream is thus maintained at a relatively low temperature and pressure until it is discharged from the fuel injector, at which time a surrounding airstream prevents the direct contact of the fuel flow with the surface of the fuel injector, and therefore prevents any carbon build-up which would otherwise occur on or near the fuel exit orifice.