The determination of optimum nozzle profiles to delay chemically frozen flow in the expansion of high temperature gas mixtures
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Authors
Kunkel, Larry Duane
Subjects
Advisors
Reichenbach, Roy E.
Date of Issue
1966-05
Date
Publisher
Monterey, California. U.S. Naval Postgraduate School
Language
en_US
Abstract
An approximate method is presented which yields the supersonic
nozzle profile necessary to keep an expanding high temperature gas mixture
approximately in chemical equilibriurrio From equilibrium calculations
for given chamber conditions, the freeze area ratio is determined by use
of a modified Bray criterion. A plot of area ratio versus a function of nozzle
geometry defines a limiting nozzle angle beyond which freezing is
forecast to occur. This permits an expansion angle at each area ratio
to be chosen to keep the flow near equilibrium. The effectiveness of the
resulting nozzle profile is evaluated by comparing exact calculations
with equilibrium calculations. Contouring is shown to be effective for
small nozzles when a correction factor is applied. The hydrogen-oxygen
system is used as an example.
Type
Thesis
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Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.