Experimentally determined effects of educator geometry on the performance of exhaust gas eductors for gas turbine powered ships.
Harrell, John Peter Jr.
Pucci, Paul F.
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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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NPS Report NumberNPS-69Pc77091
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