EXPERIMENTALLY DETERMINED EFFECTS OF EDUCTOR GEOMETRY ON THE PERFORMANCE OF EXHAUST GAS EDUCTORS FOR GAS TURBINE POWERED SHIPS
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 non-dimensional 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. (Author)
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Corporate Authors:
Naval Postgraduate School
1 University Circle
Monterey, CA United States 93943 -
Authors:
- Harrell, JPJ
- Publication Date: 1977-9
Media Info
- Pagination: 238 p.
Subject/Index Terms
- TRT Terms: Air; Cooling; Diameter; Ejectors; Emission control systems; Engines; Exhaust gases; Gas turbines; Geometric configurations and shapes; Geometry; Length; Marine diesel engines; Mixing; Multimodal transportation; Nozzles; Performance; Ratios; Shape; Ships; Theses
- Uncontrolled Terms: Configuration; Parameters
- Old TRIS Terms: Cold flow; Exhaust nozzles; Geometric forms; Multimode; Performance engineering; Smoke stacks; Standoff
- Subject Areas: Marine Transportation; Vehicles and Equipment;
Filing Info
- Accession Number: 00174476
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: NPS-69PC77091 MS Thesis
- Files: TRIS
- Created Date: Mar 14 1978 12:00AM