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Investigation of the Transmission of a Shock Wave through an Orifice

Monroe, Louis L. (1958) Investigation of the Transmission of a Shock Wave through an Orifice. Hypersonic Research Project Memorandum, 46. California Institute of Technology , Pasadena, CA. (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20151028-163306782

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Abstract

A shock wave propagating in air in a shock tube was reflected from an orifice plate, and the strength or Mach number of the transmitted wave was measured for a range of incident shock Mach numbers from 3 to 9 for several types of orifices. Also schlieren photographs of the starting flow pattern were made for some of the orifices investigated. The measured values of transmitted shock strength are compared with predicted values based on a theoretical one-dimensional flow model for both an ideal gas and a real gas. The agreement between the measured values of transmitted wave Mach number and the theoretically predicted values is extremely good in the Mach number range investigated for a wedge type orifice at an ambient shock tube pressure of 5.0 mm Hg, and also for a conical type orifice at an ambient shock tube pressure of 2.5 mm Hg. For both orifices the ratio of outlet area to inlet area is 7.67. The data also indicate that for a wedge type orifice of area ratio of 23.0 and for a plate (free expansion) type orifice of area ratio 23.0 possible boundary layer and shock wave interactions downstream of the orifice result in measured values of transmitted wave Mach number somewhat greater than that predicted by the one-dimensional flow model. Investigation of the conical orifice with an area ratio 7.67 at a low ambient pressure in the shock tube (0.4 mm Hg) also yields measured values of transmitted wave Mach number greater than that predicted by the one-dimensional flow model, indicating the probable development of a thick boundary layer behind the transmitted wave downstream of the orifice.


Item Type:Report or Paper (Technical Report)
Related URLs:
URLURL TypeDescription
http://resolver.caltech.edu/CaltechETD:etd-08122005-134039Related ItemThesis
Additional Information:Hypersonic Research Project Memorandum no. 46. Army Ordnance Contract No. DA-04-495-Ord-19. Army Project No. 5B0306004 Ordnance Project No. TB3-0118 OOR Project No. 1600-PE.
Group:Hypersonic Research Project
Funders:
Funding AgencyGrant Number
U.S. Army Office of OrdnanceDA-04-495-Ord-19
Series Name:Hypersonic Research Project Memorandum
Issue or Number:46
Record Number:CaltechAUTHORS:20151028-163306782
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20151028-163306782
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61700
Collection:CaltechAUTHORS
Deposited By: Kristin Buxton
Deposited On:29 Oct 2015 18:16
Last Modified:03 Oct 2019 09:10

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