Lobed convergent/divergent supersonic nozzle ejector system
US6877960B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2002 |
| Grant date | Apr 12, 2005 |
| Priority date | — |
| Expiry date | Jun 5, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04F5/46
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An ejector system comprises a lobed, supersonic primary nozzle and a convergent/divergent ejector shroud. The lobed nozzle is just upstream from the ejector shroud, such that there is an annular space between the nozzle and shroud for admitting a secondary flow. In operation, a primary flow of high-pressure steam or air is directed through the primary nozzle, where it is accelerated to supersonic speed. The primary flow then exits the primary nozzle, where it entrains and is mixed with the secondary flow, creating a low pressure region or vacuum. The ejector shroud subsequently decelerates the combined flow while increasing the flow pressure, which increases suction performance and reduces energy loss. Because the primary nozzle mixes the two flows, the ejector shroud is able to have a length-to-entrance-diameter ratio significantly smaller than typical shrouds/diffusers, which decreases the system's size and increases performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.