AN EXPERIMENTAL INVESTIGATION INTO THE SHAPE OF THRUST-AUGMENTING SURFACES IN CONJUNCTION WITH COANDA-DEFLECTED JET SHEETS (PART 1)

Abstract

It is known that by means of additional surfaces, the thrust of a jet or jet sheet can be enhanced (thrust augmentation). This especially applies to Coandadeflected jet sheets because of the inherent stronger entrainment into curved flow surfaces. The flow from a two-dimensional subsonic nozzle was deflected by quadrants. A composite thrust-augmenting surface was added, and the effect of its shape on thrust augmentation was studied at various nozzle pressure ratios and radii of the quadrants. This investigation yielded a maximum thrust augmentation of 1.21 for several optimum configurations, which was governed primarily by the relative magnitude and direction of the momentum of the secondary (entrained) flow in relation to the primary (nozzle) flow momentum. Thrust augmentation decreased with increasing nozzle pressure ratio but was independent of the quadrant radius. Some of the observed results were predicted theoretically. Suggestions for possibly introducing higher thrust augmentation are offered.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1964
Accession Number
AD0611759

Entities

People

  • C. D. Hope-gill

Organizations

  • University of Toronto

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Supplies
  • Barometric Pressure
  • Coanda Effect
  • Energy Transfer
  • Flow Visualization
  • Fluid Flow
  • Mass Flow
  • Military Research
  • Plastic Explosives
  • Pressure Gradients
  • Secondary Flow
  • Static Pressure
  • Strain Gages
  • Subsonic Nozzles
  • Thrust Augmentation
  • Turbines
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Combustion and Flow Dynamics.