Author

Cooper

Date of Award

12-2005

Degree Name

Master of Science in Engineering

Department

Mechanical and Aerospace Engineering

Department

Mechanical and Aeronautical Engineering

First Advisor

Dr. Parviz Merati

Second Advisor

Dr. William Liou

Third Advisor

Dr. Chris Cho

Access Setting

Masters Thesis-Open Access

Abstract

An Experimental study of internal forced lobed mixers similar to those used in jet aircraft engines is performed using whole field species concentration and velocity measuring techniques. Planar temperature and velocity measurements using Planar Laser Induced Fluorescence (PLIF) and 2D Particle Image Velocimetry (PIV) are performed for lobed, lobed scalloped and splitter mixers in aqueous solution. Specific emphasis is given to study scallops or notches cut into the mixer trailing edge and their role in mixing enhancement. Mixing is compared through velocity and species concentration measurements on axial and streamwise planes for the three dimensional, forced mixers in a confined constant area mixing duct.

Scalloped lobed mixer results indicate additional mixing over that of a lobed mixer of the same geometry. The scalloped nozzle shows more rapid shear layer growth and scalar mixing in sidewall regions in comparison with the lobed mixer in the enhanced mixing region. Additionally, impingement of the cross stream velocity on the mixing duct is further downstream than for the lobed mixer under same test condition. Lastly, the decay of cross stream velocity shows the scalloped mixer to decay from the exit plane while the lobed mixer indicates initial rise in magnitude before decay.

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