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

View/ Open
Author
Harrell, John Peter Jr.
Date
1977-09Advisor
Pucci, Paul F.
Metadata
Show full item recordAbstract
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.
Description
Approved for public release; distribution is unlimited
NPS Report Number
NPS-69Pc77091Collections
Related items
Showing items related by title, author, creator and subject.
-
Pressure distribution and performance impacts of aerospike nozzles on rotating detonation engines
Schnabel, Mark C. (Monterey, California: Naval Postgraduate School, 2017-06);Rotating detonation engines (RDEs) have the potential to further increase the performance of air-breathing propulsion devices and are currently being explored as an option for missions with wide altitude and flight Mach ... -
Pressure Distribution and Performance Impacts of Aerospike Nozzles on Rotating Detonation Engines
Schnabel, Mark C.; Brophy, Christopher M. (2018);Rotating detonation engines (RDE) have the potential to further increase the performance of air-breathing propulsion devices and are currently being explored as an option for missions with wide altitude and flight Mach ... -
Model tests of multiple nozzle exhaust gas educator systems for gas turbine powered ships.
Ellin, Charles Robert (Monterey, California. Naval Postgraduate School, 1977-06); NPS-69Pc77061Cold flow model tests of multiple nozzle exhaust gas eductor systems with constant area mixing stacks were conducted to evaluate effects of geometric configuration on eductor performance. A one-dimensional analysis of a ...