Accession Number : AD0709192

Title :   THE CHARACTERISTICS OF A SMALL VARIABLE GEOMETRY EJECTOR.

Descriptive Note : Final rept.,

Corporate Author : AEROSPACE RESEARCH LABS WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Quinn,Brian

Report Date : APR 1970

Pagination or Media Count : 46

Abstract : The characteristics of a variable geometry ejector were studied experimentally. Reorienting the ejector diffuser doors produced minor changes in the magnitude of the thrust vector while significantly changing its direction. The ejector was found to be an effective mass augmentor, entraining approximately 7 pounds of ambient air per pound of primary air. However, the developed thrust was found to fall around 25 percent short of the thrust produced by an isentropic expansion of the same primary mass. Experiments with the ejector confined within a cylindrical shell indicated no discernable change in the level of thrust although a two or three degree change in thrust direction was measured. This was attributed to the interaction flow field established within the confinement cylinder. (Author)

Descriptors :   (*JET PUMPS, *THRUST AUGMENTATION), DIFFUSERS, THRUST VECTOR CONTROL SYSTEMS, CYLINDRICAL BODIES, FLOW FIELDS, INTERACTIONS

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE