ANNULAR NOZZLE EJECTOR
Abstract
A study was made of the annular ejector to determine a configuration that accomplishes the following: equals or improves out of ground effect performance; gives superior performance in ground effect; and overcomes the performance loss during ground effect transition. An investigation was made of the combined possibilities of a conically divergent annular primary jet, wide angle augmenter tube, and flow control vanes. The particular primary nozzle geometry chosen (jet aspect ratio, jet divergence angle and area ratio) did not combine effectively with wide angle augmenters to achieve an ejector with out of ground effect performance superior. The investigation also include d the use of vanes at the bellmouth and augmenter inlets and a the aug enter exit. Proper use of the vanes reduced the augmentation loss in ground effect transition to approximately 1/3 the loss without vanes. Full-scale ejector tests indicated that bellmouth losses chargeable to lip separation could be eliminated by a flat lip extension.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1961
- Accession Number
- AD0278535
Entities
People
- J. W. Fairbanks
- M. F. Gates