Viscid/Inviscid Interaction Analysis of Thrust Augmenting Ejectors.

Abstract

A method has been developed for calculating the static performance of thrust augmenting ejectors by matching a viscous solution for the flow through the ejector to an inviscid solution for the flow outside the ejector. In effect, the ejector shroud is considered to be 'flying' in the secondary velocity field induced by the entrainment of the primary jets. A two-dimensional analysis utilizing a turbulence kinetic energy model for the inner, jet mixing solution and potential flow singularities for the outer, induced flow is described. This approach offers the advantage of including external influences on the flow through the ejector. Comparisons with data are presented for an ejector having a single central nozzle and Coanda jets on the walls. The accuracy of the matched solution is found to be especially sensitive to the jet flap effect of the flow just downstream of the ejector exit. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Feb 28, 1978
Accession Number
ADA059546

Entities

People

  • A. D. Dejoode
  • P. M. Bevilaqua

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Barometric Pressure
  • Boundary Layer
  • Computational Fluid Dynamics
  • Curvature
  • Differential Equations
  • Diffusers
  • Diffusion
  • Experimental Data
  • Fluid Dynamics
  • Jet Flaps
  • Leading Edges
  • Mass Flow
  • Pressure Distribution
  • Pressure Gradients
  • Shear Stresses
  • Short Takeoff Aircraft
  • Turbulent Mixing

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Fluid Dynamics.