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TECHNICAL PAPERS

A Study of Near-Field Entrainment in Gas Jets and Sprays Under Diesel Conditions

[+] Author and Article Information
Scott Post, Venkatraman Iyer, John Abraham

School of Mechanical Engineering Purdue University, West Lafayette, IN 17906

J. Fluids Eng 122(2), 385-395 (Dec 20, 1999) (11 pages) doi:10.1115/1.483268 History: Received January 21, 1999; Revised December 20, 1999
Copyright © 2000 by ASME
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References

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Figures

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The computational domain and grid used for gas jet computations
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Velocity vector plots at 50 ms after start of injection for two gas jet computations. (a) Case GA; (b) Case GB.
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Jet centerline velocity at 50 ms after start of injection in the steady region of an atmospheric jet. Computations are compared with two sets of experimentally measured values.
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Jet velocity half-width at 50 ms after start of injection in atmospheric jet
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Axial mass flow rate at different times after start of injection for gas jet under atmospheric conditions
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Axial mass flow rate at different times after start of injection for gas jet under Diesel conditions
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Computed nondimensional entrainment constant in the near field of steady gas jets using the axial flux and radial flux methods to compute entrainment
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A comparison of computed entrainment constant in the near-field of steady gas jets with measured results from literature
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Inlet velocity profiles used in gas jet computations
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Computed centerline velocity in gas jet Case GA at 200 ms after start of injection with flat and triangular orifice exit velocity profiles
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Computed entrainment constant in gas jet Case GA at 200 ms after start of injection with flat and triangular orifice exit velocity profiles
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Normalized entrainment constant in transient jet at different times after start of injection
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Schematic of the cylindrical control surface that defines the measure locations
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Computations grid for spray computations
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Variation of entrainment velocity with time in spray at two different axial locations for Case SA
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A comparison of measured and computed entrainment constant in steady sprays
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A comparison of the effects of different initial k-ε values on computed entrainment constant in sprays. Cases SA and SC shown at two different times ASI.
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Computed entrainment constant for sprays at 3 ms ASI showing effects of ambient temperature and initial drop size on computed entrainment

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