DRIVER GAS CONTAMINATION IN SHOCK TUNNELS

Abstract

Shock tunnels are normally operated with flow times of many milliseconds, as indicated by an approximately constant reservoir pressure. This testing time is at a maximum under conditions of contact surface tailoring. It is shown how considerable amounts of driver gas can penetrate far into the test gas and contaminate the latter much sooner than the arrival of the bulk of the driver gas. Under certain conditions, this process can drastically shorten the constant properties testing time, without materially affecting the pressure. High speed gas sampling results confirm this phenomenon in a shock tunnel, and indicate the arrival of large concentrations of driver gas in less than half the time indicated by pressure records. A possible mechanism for premature arrival of driver gas, by bifurcation of the reflected shock, is described.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1968
Accession Number
AD0682129

Entities

People

  • J. K. Richmond
  • R. J. Parsons

Organizations

  • Boeing

Tags

Communities of Interest

  • Advanced Electronics
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Boundary Layer
  • Chemical Engineering
  • Combustion
  • Engineering
  • Flow
  • Fuel Injectors
  • Gases
  • Heat Transfer
  • Mach Number
  • Measurement
  • Pressure Measurement
  • Pressure Testing
  • Shock Tubes
  • Shock Tunnels
  • Stagnation Pressure
  • Static Pressure
  • Thin Films

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Integrated Circuit Design and Technology.
  • Mathematics or Statistics