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Axially-symmetric, jet-diffuser ejector

  • US 4,815,942 A
  • Filed: 10/25/1982
  • Issued: 03/28/1989
  • Est. Priority Date: 10/25/1982
  • Status: Expired due to Term
First Claim
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1. An ejecting structure comprising an axially symmetric ejecting structure having a converging inlet section and a diffusing section downstream from the inlet section and throat of the ejecting structure for diffusing the core fluids, a plurality of primary injection nozzle means for injecting a pressurized fluid into the inlet section of the ejecting structure, said primary injection nozzle means being attached to the ejecting structure and being arranged in a preselected symmetrically spaced relationship around the inlet section without protruding outside the ejecting structure and permitting a flow of ambient fluid to be induced into the ejector through the spaces between the primary injection nozzle means to be mixed with the fluid injected into the ejector by said nozzle means, said primary injection nozzle means being further characterized as arranged at a preselected acute angle to the normal to the thrust axis for injecting a pressurized fluid at a point radially spaced from the ejector structure and in the approximate direction of the flow of the induced fluid to be mixed therewith to thereby provide the mixed core fluids to be conveyed through the ejecting structure,the diffusing section of the ejector is constructed and defined to comprise a solid upstream diverging section and a solid downstream diverging section having a large fluid outlet to fluid inlet area ratio in a relatively small length in the direction of thrust through the provision of a divergence angle greater than 7 or 8 degrees and as large as 60 degrees relative to the axis of the ejector for the solid downstream section, the diffusing section including diffuser jet means arranged intermediate the upstream and downstream diffusing sections for introducing a thin, high speed jet stream completely surrounding the periphery of the ejecting structure and flowing into the diffusing section along the diffuser solid wall to prevent separation in the downstream diffusing section and to cause the core fluids to diffuse beyond the end of the downstream diffusing section to thereby provide said large area ratio in a relatively small length of the short, solid, diffusing section, and means for supplying a pressurized fluid to the primary injection means and the diffuser jet means.

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