Theory and Practice of Ejector Scaling

Abstract

Procedures are described for utilizing scale models for the development of thrust augmenting ejectors. Physical reasoning and the methods of dimensional analysis are used to argue that the Mach numbers must be matched, but that the Reynolds number is not a relevant parameter if its value is large. Numerical analysis is used to show that almost no change in performance may be expected from the use of cold air jets. Experimental data is presented to support these results. Thus, it is concluded that scale model ejectors powered by cold jets provide a close approximation to the performance of full size ejectors powered by hot jet exhaust flows.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1982
Accession Number
ADP000530

Entities

People

  • C. P. Combs
  • P. M. Bevilaqua

Tags

DTIC Thesaurus Topics

  • Accuracy
  • Air Flow
  • Air Supplies
  • Experimental Data
  • Flow
  • Load Cells
  • Mach Number
  • Mass Flow
  • Mathematical Analysis
  • Model Tests
  • Models
  • Numerical Analysis
  • Physical Properties
  • Propulsion Systems
  • Reynolds Number
  • Scale Models
  • Turbulent Mixing

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.