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An Experimental Investigation of the Equilibrium Interface Technique


Copper, John Alan (1961) An Experimental Investigation of the Equilibrium Interface Technique. Engineer's thesis, California Institute of Technology. doi:10.7907/XC3A-2540.


The equilibrium interface technique has been suggested as a possible shock tunnel driver method. If this technique is workable, reservoir enthalpy levels can be increased substantially over those obtainable with the tailored interface technique without any physical modification of the shock tube. In order to determine the feasibility of the equilibrium interface technique as a shock tunnel driver method, experiments were performed in a shock tube, utilizing a cold helium driver, over the shock Mach number range 3.29 to 7.26. Pressure histories were measured at the end of the driven tube; this pressure was found to reach an equilibrium condition for the complete shock Mach number range investigated. From the pressure histories the equilibrium pressure, time to reach equilibrium, and test time were determined. Measured equilibrium pressures were compared with an exact theory and two approximate theories. From the measured equilibrium pressure, the equilibrium enthalpy level was computed. The maximum equilibrium enthalpy was more than six times the reservoir enthalpy produced using the tailored interface technique.

Item Type:Thesis (Engineer's thesis)
Subject Keywords:(Aeronautical Engineering)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Roshko, Anatol
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1961
Record Number:CaltechETD:etd-12092005-080829
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4900
Deposited By: Imported from ETD-db
Deposited On:09 Dec 2005
Last Modified:11 Nov 2023 00:16

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