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Jet-diffuser Ejector - Attached Nozzle DesignAttached primary nozzles were developed to replace the detached nozzles of jet-diffuser ejectors. Slotted primary nozzles located at the inlet lip and injecting fluid normal to the thrust axis, and rotating the fluid into the thrust direction using the Coanda Effect were investigated. Experiments indicated excessive skin friction or momentum cancellation due to impingement of opposing jets resulted in performance degradation. This indicated a desirability for location and orientation of the injection point at positions removed from the immediate vicinity of the inlet surface, and at an acute angle with respect to the thrust axis. Various nozzle designs were tested over a range of positions and orientations. The problems of aircraft integration of the ejector, and internal and external nozzle losses were also considered and a geometry for the attached nozzles was selected. The effect of leaks, protrusions, and asymmetries in the ejector surfaces was examined. The results indicated a relative insensitivity to all surface irregularities, except for large protrusions at the throat of the ejector.
Document ID
19810010885
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Alperin, M. (Flight Dynamics Research Corp. Van Nuys, CA, United States)
Wu, J. J. (Flight Dynamics Research Corp. Van Nuys, CA, United States)
Date Acquired
September 4, 2013
Publication Date
May 1, 1980
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-CR-152361
Accession Number
81N19412
Funding Number(s)
CONTRACT_GRANT: NAS2-10059
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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