초록 ▼

Use of a shrouding gas to combine with and protect a turbulent gas jet issuing from an orifice enables control of a gas jet stream composition downstream from the orifice. The natural aspiration rate of the gas jet is used to determine the flowrateof shrouding gas which is introduced around the gas

Use of a shrouding gas to combine with and protect a turbulent gas jet issuing from an orifice enables control of a gas jet stream composition downstream from the orifice. The natural aspiration rate of the gas jet is used to determine the flowrateof shrouding gas which is introduced around the gas jet in a soft gas cushion which does not disrupt the flow pattern of the gas jet but instead is entrained into the jet stream to the exclusion of ambient gases in the atmosphere. Preferably shrouding gas is replaced at least at the rate at which it is entrained. Apparatus for this process uses a porous shroud, preferably of metal foam, through which shrouding gas flows evenly around the gas jet as it issues from a nozzle orifice. Provision for tangential entry of shrouding gas into a manifold which feeds the porous shroud prevents the shrouding gas from impinging upon the porous shroud and causing uneven flow around the gas jet.

대표청구항 ▼

[ We claim:] [1.] Apparatus for producing a shrouded gas jet comprising:(a) gas conduit means terminating in an orifice through which a turbulent gas jet can issue along an axis into an aspiration zone,(b) shroud gas manifold means disposed annularly around said orifice and at least a portion of sai

[ We claim:] [1.] Apparatus for producing a shrouded gas jet comprising:(a) gas conduit means terminating in an orifice through which a turbulent gas jet can issue along an axis into an aspiration zone,(b) shroud gas manifold means disposed annularly around said orifice and at least a portion of said aspiration zone, said manifold means extending from said orifice to a point downstream thereof,(c) a wall of porous media positioned in the flow path between said manifold means and said aspiration zone so that shroud gas in said manifold means must pass through said porous media in a direction normal to the aspiration zone side of the wall on its way to said aspiration zone, and(d) means for introducing shroud gas into said manifold means: rein said means for introducing shroud gas is disposed to introduce shroud gas tangentially into said manifold means so that said shroud gas does not forcibly impinge directly on said porous media.