NDLI: Parametric study of a mixer/ejector nozzle with mixing enhancement devices

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Parametric study of a mixer/ejector nozzle with mixing enhancement devices

Content Provider	NASA Technical Reports Server (NTRS)
Author	DalBello, T. Steffen Jr., C. J.
Copyright Year	2001
Description	A numerical study employing a simplified model of the High Speed Civil Transport mixer/ejector nozzle has been conducted to investigate the effect of tabs (vortex generators) on the mixing process. More complete mixing of the primary and secondary flows within the confined ejector lowers peak exit velocity resulting in reduced jet noise. Tabs were modeled as vortex pairs and inserted into the computational model. The location, size, and number of tabs were varied and its effect on the mixing process is presented here both quantitatively and qualitatively. A baseline case (no tabs) along with six other cases involving two different vortex strengths at three different orientations have been computed and analyzed. The case with the highest vorticity (six vortices representing large tabs) gives the best mixing. It is shown that the influence of the vorticity acts primarily in the forward or middle portions of the duct, significantly alters the flow structure, and promotes some mixing in the lateral direction. Unmixed pockets were found at the top and bottom of the lobe, and more clever placement of tabs improved mixing in the vertical direction. The technique of replacing tabs with vortices shows promise as an efficient tool for quickly optimizing tab placement in lobed mixers.
File Size	6368887
Page Count	17
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20020038861
Archival Resource Key	ark:/13960/t4zh1km3p
Language	English
Publisher Date	2001-12-01
Access Restriction	Open
Subject Keyword	Aerodynamics Ducted Flow Tabs Control Surfaces Flow Distortion Exhaust Nozzles Nozzle Flow Vortices Ejectors Vorticity Mixers Turbulent Mixing Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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