ZERO SECONDARY FLOW EJECTOR-DIFFUSER PERFORMANCE USING ANNULAR NOZZLES
ARO INC ARNOLD AFS TN
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An investigation was conducted to determine the performance of zero- secondary flow ejector diffuser systems using annular driving nozzles. Eight annular nozzles with various geometrics, including one expansion-deflection E- D nozzle, were tested in cylindrical diffusers having various diffuser lengths. The ejector starting and pumping characteristics were compared and found similar to the empirical relations developed for ejectors having conventional convergent-divergent nozzles. The unique problems associated with simulated altitude testing of the E-D nozzle and the effects of ejector diffuser design on E-D nozzle performance are discussed. A method is described for determining the ejector pumping characteristics when the ejector is unstarted to satisfy the annular nozzle test requirement for altitude simulation at conditions other than minimum cell pressure.
- Electrical and Electronic Equipment