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TECHNICAL PAPERS

Numerical Simulation on the Flow Structure Around the Injection Nozzles for Pneumatic Dimensional Control Systems

[+] Author and Article Information
S. C. M. Yu, H. J. Poh, C. P. Tso

Thermal and Fluids Engineering Division, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798

J. Fluids Eng 122(4), 735-742 (Aug 03, 2000) (8 pages) doi:10.1115/1.1319497 History: Received October 08, 1998; Revised August 03, 2000
Copyright © 2000 by ASME
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References

Wattebot, L., 1937, “Principles of the Pneumatic Amplification,” J. Mech. (in French), pp. 70–72.
Crnojevic,  C., Roy,  G., Bettahar,  A., and Florent,  P., 1997, “The Influence of the Regulator Diameter and Injection Nozzle Geometry on the Flow Structure in Pneumatic Dimensional Control Systems,” ASME J. Fluids Eng., 119, pp. 609–615.
Roy, G., Crnojevic, C., Bettahar, A., Florent, P., and Vo-Ngoc, D., 1994, “Influence of Nozzle Geometry in Radial Flow Applications,” Proc. International Conference on Fluid and Thermal Energy Conversion, Vol. 1, Bali, Indonesia, pp. 363–368.
FLUENT, User’s Manual, Version 4.3, Fluent Inc, 1991–1993.
Markow,  B. N., 1971, “Pneumatic Dimensional System with the Measuring Nozzle,” Feineratetechnik (in German),20, Jg.Helt 4, pp. 160–161.

Figures

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Pressure distribution on the flat plate at Pal=3 bar and at different δ
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Schematic of the streamlines between nozzle frontal area and flat plate
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Velocity along the δ/2 plane
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Critical section for (a) δ=100 μm and (b) 400 μm
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Comparison between experiment and simulation for the volume flow rate as a function of δ for D/d=0.5 and Pal=3 bar
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Volume-flow rate as a function of δ for different ratio of D/d with Pal=3 bar
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Stagnation pressure as a function of δ for different ratio of D/d with Pal=3 bar
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Wall pressure distribution on the flat plate at different supply pressure for δ=200 μm and D/d=0.5
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Schematic of different nozzle designs
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Wall pressure distribution for convergent type of nozzle inlet at δ=200 μm, D/d=0.5 and Pal=3 bar
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Wall pressure distribution for divergent type of nozzle inlet at δ=200 μm, D/d=0.5 and Pal=3 bar
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Wall pressure distribution for N2 and INV N2 nozzle at δ=200 μm, D/d=0.5 and Pal=3 bar
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Velocity vector for N2 and INV N2 nozzle, with Pal=3 bar,D/d=0.5 and δ=200 μm
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Angle variation for INV N2 nozzle
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Variation of stagnation pressure for nozzle NS and N2 with D/d=0.5 and Pal=3 bar
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Variation of stagnation pressure at various α for INV N2 nozzle with D/d=0.5 and Pal=3 bar
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Variation of stagnation pressure for nozzle at different α and D/d ratio for Pal=3 bar
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Schematic of the pneumatic dimensional control system
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Geometry of the pneumatic dimensional control system and the coordinate system adopted in the present simulation
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Grid generated for the pneumatic dimensional control system (81(r) by 193(z))
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Comparison between experiment and simulation using different flow models
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Comparison between experiment and simulation on the wall static pressure distribution at Pal=2 bar
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Comparison between experiment and simulation on the wall static pressure distribution at Pal=3 bar

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