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Theoretical Base Pressure Analysis of Axisymmetric Ejectors Without Induced Flow

Report Number: AEDC TDR 64-3
Author: Bauer, R. C.
Corporate Author: ARO, Inc.
Laboratory: Arnold Engineering Development Center
Date of Publication: 1964-01
Pages: 50
Contract: AF 40(600)-1000
Project: 6950
Task: 695002
AD Number: AD0428533

The two-dimensional supersonic base pressure theory developed by Dr. H. H. Korst, which applies to two-dimensional systems with straight jet boundaries, has been modified to be more applicable to axisymmetric ejector systems. The modification consists of a new theory for estimating the peak recompression static pressure which is applicable to either axisymmetric or two-dimensional jets having straight or curved boundaries. Significantly, the recompression mechanism is not independent of viscous effects for systems which produce a non-uniform inviscid flow field. Both the recompression theory and the modified base pressure theory are experimentally verified for the case of isoenergetic mixing and negligible initial boundary layer. The recompression theory is shown to agree with experimental results to within =10% whereas the experimental base pressure results have a standard deviation of 6% with respect to the modified base pressure theory.

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