Longitudinal Mode Acoustic Losses in Short Nozzles.
NAVAL WEAPONS CENTER CHINA LAKE CALIF
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The report is a revision of a previous report AD-728 754 that investigated longitudinal mode acoustic losses in short nozzles. In the present report the analysis of nozzle acoustic losses has been extended to rigorously account for second order effects. It is shown herein that when the time average of the mass flux in the wave is zero, the nozzle acoutic losses can be expressed in terms of first order quantities only. It is also shown that the term describing the nozzle acoustic losses is the flux term in an equation that describes the instantaneous conservation of wave energy in the presence of mean flow. The revised report establishes the relationship between nozzle acoustic losses and the expressions used to calculate the nozzle decay coefficient. Author
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