Accession Number:

ADA073378

Title:

High Speed Ejectors.

Descriptive Note:

Final rept. Sep 77-Dec 78,

Corporate Author:

FLIGHT DYNAMICS RESEARCH CORP VAN NUYS CALIF

Personal Author(s):

Report Date:

1979-05-01

Pagination or Media Count:

92.0

Abstract:

The performance of solid and jet-diffuser ejectors in motion in their thrust direction was analyzed under the assumption that all fluids are compressible and have arbitrary properties. Two solutions to the equations representing the laws of mass flow and energy conservation and the momentum theorem were obtained. The solutions were examined and only those regions that were consistent with the Second Law of Thermodynamics wee utilized. In these valid regions, three distinct characteristic points were observed, and chosen as criteria for classification of ejector performance. These characteristic points determined which of nine possible ejector configurations provided optimal performance at any given flight and injected gas conditions. Detailed examination of the thermodynamic cycle was made for representative cases and data was presented to illustrate the influence of ejectors upon conventional gas generator performance. The influence of nozzle loss, skin friction and flow separation, incomplete kinetic and thermal mixing, and boundary layer ingestion were taken into consideration in the analysis. Correlation with existing stationary solid and jet-diffuser ejector experiments showed excellent agreement between theory and experiment. It has been shown that ejectors designed according to the methods described, can provide large improvement in propulsion system performance throughout the entire practical flight regime. Author

Subject Categories:

  • Fluid Mechanics
  • Thermodynamics
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE