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Technical Briefs

Spreadsheet Calculations for Jets in Crossflow From Single and Opposed Rows With Alternating Hole Sizes

[+] Author and Article Information
J. D. Holdeman1

 National Aeronautics and Space Administration, Glenn Research Center, Cleveland, OH 44135jjdholdeman@aol.com

J. R. Clisset2

 University of Florida, Gainesville, FL 32611

J. P. Moder

Combustion Branch, Propulsion Systems Division, National Aeronautics and Space Administration, Glenn Research Center, Cleveland, OH 44135

1

Corresponding author. Retired.

2

Present address: U.S. Army Proving Grounds, Yuma, AZ.

J. Eng. Gas Turbines Power 132(6), 064502 (Mar 18, 2010) (7 pages) doi:10.1115/1.4000129 History: Received April 09, 2009; Revised May 14, 2009; Published March 18, 2010; Online March 18, 2010

The primary purpose of this study was to show the expected results for cases of single and opposed rows of jets from alternating large and small round holes. Previous publications demonstrated that the NASA empirical model gave results that were an excellent representation of mean experimental scalar results and that the model could confidently be used to investigate configurations for which results have not been published in the open literature. Calculations for cases of opposed rows of jets that would overpenetrate slightly in an inline configuration showed that better mixing was attained when one row was shifted to make a staggered configuration so that a small hole was opposite from a larger one. However, the result was no better than for an optimum inline configuration with all the holes of the same size. Staggering the rows does not make much difference in an optimum inline configuration. For all cases investigated, the dimensionless variance of the mixture fraction decreased significantly with increasing downstream distance, but, at a given downstream location, the variation between cases was small.

FIGURES IN THIS ARTICLE
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Copyright © 2010 by American Society of Mechanical Engineers
Topics: Jets , Scalars
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References

Figures

Grahic Jump Location
Figure 1

Schematic for flow field for one-side injection of a row of jets in a confined crossflow, shown for injection from the top duct wall

Grahic Jump Location
Figure 2

Variation in scalar profile and contour plots for one-side injection from alternating size holes at x/H=0.5 for DR=2.2, J=26.4, Cd=0.64, with Sx/H=0

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Figure 3

Variation in scalar profile and contour plots for opposed rows of alternating hole sizes with similar holes opposite each other for S/H=0.5, H/d=8 and S/H=0.25, H/d=11.31 on each side with Sx/H=0 (total AJ/AM=0.098), DR=2.2, J=26.4, and Cd=0.64

Grahic Jump Location
Figure 4

Variation in scalar profile and contour plots for opposed rows of alternating hole sizes with large and small holes opposite each other for S/H=0.5, H/d=8 and S/H=0.25, H/d=11.31 on each side with Sx/H=0 (total AJ/AM=0.098), DR=2.2, J=26.4, and Cd=0.64

Grahic Jump Location
Figure 5

Variation in scalar profile and contour plots for opposed rows of inline jets (total AJ/AM=0.098) at x/H=0.125 with DR=2.2, J=26.4, and Cd=0.64

Grahic Jump Location
Figure 6

Variation in scalar profile and contour plots for opposed rows of inline jets (total AJ/AM=0.098) at x/H=0.5 with DR=2.2, J=26.4, and Cd=0.64.

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