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Parametric Study of a Mixer/Ejector Nozzle with Mixing Enhancement Devices

Parametric Study of a Mixer/Ejector Nozzle with Mixing Enhancement Devices


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About the Book

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. DalBello, T. and Steffen, C. J., Jr. Glenn Research Center NASA/TM-2001-211341, E-13154, NAS 1.15:211341, ICOMP-2001-02, AIAA Paper 2001-0667


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Product Details
  • ISBN-13: 9781721295777
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1721295771
  • Publisher Date: 19 Jun 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 100 gr


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