IMPACT PRESSURE AND TEMPERATURE PROFILES IN A NON-ISOTHERMAL JET DISCHARGING INTO A DUCT

Abstract

A literature survey was made in an attempt to find an explanation of abnormal velocity profiles near the duct walls of air jets discharging into ducts. This choking effect was attributed to downstream air becoming entrained after returning along the duct walls. Experiments were reported in which choking appeared to be eliminated by utilizing a smooth transition entry section on the duct. These experiments were not considered proof of the choking theory, because other experiments did not support the hypothesis of returning downstream air. Simple flow theories appeared to predict air flows which were much slower than expected near the duct wall at locations close to the nozzle in a system utilizing a sudden entrance section for the secondary air. However, the pattern appeared to be normal in terms of a convergent theory.

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Document Details

Document Type
Technical Report
Publication Date
Sep 30, 1953
Accession Number
AD0023269

Entities

People

  • Arnold Kivnick
  • R. D. Danielson

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Flow
  • Air Force
  • Air Force Facilities
  • Boundary Layer
  • Climate Change
  • Flow
  • Fluid Mechanics
  • Gas Turbines
  • Guided Missiles
  • Illinois
  • Measurement
  • Mechanical Equipment
  • Mechanics
  • Military Research
  • New York
  • Universities

Readers

  • Combustion and Flow Dynamics.
  • Theoretical Analysis.