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A composite model for a class of electric-discharge shock tubesA gasdynamic model is presented and analyzed for a class of shock tubes that utilize both Joule heating and electromagnetic forces to produce high-speed shock waves. The model consists of several stages of acceleration in which acceleration to sonic conditions is achieved principally through heating, and further acceleration of the supersonic flow is obtained principally through use of electromagnetic forces. The utility of the model results from the fact that it predicts a quasi-steady flow process, mathematical analysis is straightforward, and it is even possible to remove one or more component stages and still have the model related to a possible shock-tube flow. Initial experiments have been performed where the electrical discharge configuration and current level were such that Joule heating was the dominant form of energy addition present. These experiments indicate that the predictions of the model dealing with heat addition correspond quite closely to reality. The experimental data together with the theory show that heat addition to the flowing driver gas after diaphragm rupture (approach used in the model) is much more effective in producing high-speed shock waves than heating the gas in the driver before diaphragm rupture, as in the case of the arc-driven shock tube.
Document ID
19740033681
Document Type
Conference Proceedings
Authors
Elkins, R. T.
Baganoff, D. (Stanford University Stanford, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1973
Subject Category
FLUID MECHANICS
Meeting Information
International Symposium on Recent Developments in Shock Tube Research(Stanford, CA)
Funding Number(s)
CONTRACT_GRANT: NGR-05-020-245
Distribution Limits
Public
Copyright
Other