Increased Jet Thrust from Pressure Forces

descriptionPublicationkeyboard_double_arrow_right Article 01 Jul 1950 English Publisher:American Institute of Aeronautics and Astronautics (AIAA)Journal:Journal of the Aeronautical Sciences, volume 17, pages 425-428 (eissn: 1936-9956,

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Authors: F. P. DURHAM;

doi: 10.2514/8.1675

Increased Jet Thrust from Pressure Forces

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Abstract

For ram-jets and turbojets, which operate with low overall jet expansion ratios, it is possible to obtain more thrust with incomplete expansion in the jet nozzle utilizing both pressure and momentum forces than with complete expansion utilizing momentum forces alone. Proof of this phenomenon is developed, and charts are introduced showing the range of pressure ratios and velocity coefficients for which incomplete expansion will produce greater thrust than complete expansion.

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University of Colorado System
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University of Colorado Boulder
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