Accession Number : ADA316863

Title :   Nozzle Geometry Effects on Strut Injection into a Supersonic Flow.

Descriptive Note : Final rept. Sep 93-Sep 95,

Corporate Author : WRIGHT LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : Glawe, Diana D. ; Nejad, Abdollah S. ; Samimy, Mohammad

PDF Url : ADA316863

Report Date : SEP 1995

Pagination or Media Count : 328

Abstract : Fuel injection from the base of a two-dimensional extended strut bounded above and below by Mach 1.92 freestreams was investigated. Without injection, a nominally two-wake flow exists behind the base of the strut. When fuel, simulated with helium, was injected parallel to the Mach 2 freestream, a highly three-dimensional complex flowfield results. The behavior of the flowfield generated by a: circular injection nozzle was compared to the results obtained with two asymmetric nozzle geometries - an elliptic nozzle and a circular nozzle with vortex-generating tabs. Flow visualization and LDV results show that the jets, for all the injection cases, are confirmed to the region which is marked by the wake region in the flow without injection, thus limiting the jet spread in the transverse direction. The jet emanating from the circular-with-tabs jet, with two tabs oriented on a vertical line, exhibits the most complete mixing downstream. The second best mixing was exhibited by the elliptic nozzle, with its major axis along a vertical line. The circular-with-tabs nozzle with tabs oriented along a horizontal line and the elliptic nozzle with major axis along a horizontal line exhibited the poorest mixing.

Descriptors :   *SUPERSONIC FLOW, *STRUTS, *FUEL INJECTION, *FUEL NOZZLES, INJECTION, TWO DIMENSIONAL, FLOW VISUALIZATION, THREE DIMENSIONAL, FUELS, FLOW FIELDS, ASYMMETRY, VERTICAL ORIENTATION, WAKE, NOZZLES, GEOMETRY, MIXING, HELIUM, HORIZONTAL ORIENTATION, CIRCULAR, TRANSVERSE, ELLIPSES.

Subject Categories : Pumps, Filters, Pipes, Tubing, Fittings & Vlvs
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE