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TECHNICAL PAPERS

The Structure of Wall-Impinging Jets: Computed Versus Theoretical and Measured Results

[+] Author and Article Information
Lijun Song, John Abraham

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Fluids Eng 125(6), 997-1005 (Jan 12, 2004) (9 pages) doi:10.1115/1.1625686 History: Received February 18, 2002; Revised July 15, 2002; Online January 12, 2004
Copyright © 2003 by ASME
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References

Figures

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Structure of an impinging jet
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Cross-section of the constant volume chamber
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Measured and computed jet penetrations of free and impinging jets; 0.25 mm (axial)×0.20 mm (radial) minimum grid size
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Effects of resolution on computed tip penetrations
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Measured and computed tip penetrations of free and impinging jets; 0.10 mm(axial)×0.10 mm(radial) minimum grid size
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Computed jet penetrations with no-slip and free-slip boundary conditions
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Effects of initial ambient diffusivity on computed jet penetrations
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Computed penetrations with different cutoff values for fuel mass fraction (f )
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Computed jet penetrations with standard k-ε model and RNG k-ε model
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Similarity velocity profiles in wall jets
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Variation of the half-width of the jet with distance from the point of impingement
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Variation of the maximum radial velocity with distance from the point of impingement
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(a) Fuel mass fraction contours at 15 ms ASI in the free jet, (b) fuel mass fraction contours at 20 ms ASI in the free jet
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(a) Fuel mass fraction contours at 15 ms in the wall-impinging jet, L=5 cm, i.e., L/D=31.25; (b) fuel mass fraction contours at 20 ms in the wall-impinging jet, L=5 cm, i.e., L/D=31.25
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Rich, flammable, and lean fraction of fuel in the jets
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Entrained volume of the jets
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Entrained volume of the jets
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Rich, flammable, and lean fraction of fuel in the jets; higher resolution

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