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Experimentally determined effects of educator geometry on the performance of exhaust gas eductors for gas turbine powered ships.

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Author
Harrell, John Peter Jr.
Date
1977-09
Advisor
Pucci, Paul F.
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Abstract
Cold flow model tests of exhaust gas eductors with constant area mixing stacks were conducted to evaluate the effects of geometric configuration on eductor performance. Single-nozzle and four -nozzle designs were tested. The other geometric variables were mixing stack length to diameter ratio (L/D) , primary nozzle standoff to diameter ratio (S/D) , and mixing stack entrance configuration. Non-dimensional parameters governing the flow phenomena are developed from a one-dimensional analysis of a simple eductor system. The eductor performance is evaluated in terms of these nondimensional parameters. The four- nozzle configurations were found to have better performance than single-nozzle configurations for L/D's less than eight. The effects of L/D, S/D, and entrance shape on performance were found to be highly interdependent at short L/D's. Performance for L/D's greater than four was found to be independent of S/D within the range of S/D's studied.
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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.
URI
http://hdl.handle.net/10945/18121
NPS Report Number
NPS-69Pc77091
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  • 1. Thesis and Dissertation Collection, all items

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    Model tests of multiple nozzle exhaust gas educator systems for gas turbine powered ships. 

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