A numerical simulation on the airflow exiting from a nozzle in a pneumatic dimensional control system has been conducted using computational fluid dynamics code FLUENT (V. 4.3), which solves finite-difference equations. The important changes occurring in the velocity and pressure fields in the vicinity of the nozzle, as the air exiting from the nozzle and impinging on a flat plate, are the prime objectives of the present studies. Simulation studies were first focus on examining the flow characteristics of the system with the conventional nozzle geometry design. Some comparisons with the experimental results previously obtained by Crnojevic et al. (Crnojevic, C., Roy, G., Bettahar, A., and Florent, P., “The Influence or the Regulator Diameter and Injection Nozzle Geometry on the Flow Structure in Pneumatic Dimensional Control Systems,” ASME J. Fluids Eng., 119, pp. 609–615) were also made. Further simulation studies were conducted with particular attention to a more efficient nozzle geometry. It was found that a divergent type of nozzle design could effectively eliminate the flow separation regions within the nozzle head. By allowing the divergent angle of the nozzle head (α) to vary (from zero to about 25 degrees), a more extensive and sensitive measurement range can be achieved at a given pressure regulator diameter to nozzle diameter ratio. [S0098-2202(00)02404-4]
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December 2000
Technical Papers
Numerical Simulation on the Flow Structure Around the Injection Nozzles for Pneumatic Dimensional Control Systems
S. C. M. Yu, Senior Lecturer,
S. C. M. Yu, Senior Lecturer
Thermal and Fluids Engineering Division, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798
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H. J. Poh, Graduate Student,
H. J. Poh, Graduate Student
Thermal and Fluids Engineering Division, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798
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C. P. Tso, Associate Professor
C. P. Tso, Associate Professor
Thermal and Fluids Engineering Division, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798
Search for other works by this author on:
S. C. M. Yu, Senior Lecturer
Thermal and Fluids Engineering Division, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798
H. J. Poh, Graduate Student
Thermal and Fluids Engineering Division, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798
C. P. Tso, Associate Professor
Thermal and Fluids Engineering Division, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division October 8, 1998; revised manuscript received August 3, 2000. Associate Technical Editor: D. Telionis.
J. Fluids Eng. Dec 2000, 122(4): 735-742 (8 pages)
Published Online: August 3, 2000
Article history
Received:
October 8, 1998
Revised:
August 3, 2000
Citation
Yu, S. C. M., Poh, H. J., and Tso, C. P. (August 3, 2000). "Numerical Simulation on the Flow Structure Around the Injection Nozzles for Pneumatic Dimensional Control Systems ." ASME. J. Fluids Eng. December 2000; 122(4): 735–742. https://doi.org/10.1115/1.1319497
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