Wind Tunnel Experiment on Improving Efficiency of Low-Re Number Grid Turbulence Generation Focusing on Cross-Sectional Geometry of Grid Bars
The aim of this study is to investigate the efficiency of turbulence generation using turbulence grids, focusing on the cross-sectional shapes of the grid bars. Efficiency in this context refers to maintaining the intensity of velocity fluctuations in the generated turbulence while reducing the drag...
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| Published in | Advanced Experimental Mechanics p. 25-0003 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English Japanese |
| Published |
The Japanese Society for Experimental Mechanics
2025
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| Subjects | |
| Online Access | Get full text |
| ISSN | 2189-4752 2424-175X |
| DOI | 10.11395/aem.25-0003 |
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| Abstract | The aim of this study is to investigate the efficiency of turbulence generation using turbulence grids, focusing on the cross-sectional shapes of the grid bars. Efficiency in this context refers to maintaining the intensity of velocity fluctuations in the generated turbulence while reducing the drag coefficient of the turbulence grid. Wind tunnel experiments were conducted using turbulence grids with three different cross-sectional shapes (circular, square, and rectangular), and the velocity fluctuation intensity and drag coefficient of the generating grids were measured. The results showed that the turbulence grid with square and rectangular cross sections produced higher velocity fluctuation intensities higher than those with circular cross sections, and the distributions of these intensities were consistent between the two shapes. In addition, the turbulence grid with a rectangular cross section had a drag coefficient about 10% lower than that of the square cross section. These results suggest that a rectangular turbulence grid may be more efficient at generating turbulence. |
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| AbstractList | The aim of this study is to investigate the efficiency of turbulence generation using turbulence grids, focusing on the cross-sectional shapes of the grid bars. Efficiency in this context refers to maintaining the intensity of velocity fluctuations in the generated turbulence while reducing the drag coefficient of the turbulence grid. Wind tunnel experiments were conducted using turbulence grids with three different cross-sectional shapes (circular, square, and rectangular), and the velocity fluctuation intensity and drag coefficient of the generating grids were measured. The results showed that the turbulence grid with square and rectangular cross sections produced higher velocity fluctuation intensities higher than those with circular cross sections, and the distributions of these intensities were consistent between the two shapes. In addition, the turbulence grid with a rectangular cross section had a drag coefficient about 10% lower than that of the square cross section. These results suggest that a rectangular turbulence grid may be more efficient at generating turbulence. |
| Author | HASEGAWA, Yutaka UEDA, Wakana SUZUKI, Hiroki |
| Author_xml | – sequence: 1 fullname: HASEGAWA, Yutaka organization: Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology – sequence: 1 fullname: SUZUKI, Hiroki organization: School of Environmental, Life, Natural Science and Technology, Okayama University – sequence: 1 fullname: UEDA, Wakana organization: Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology |
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| References | [10] Kashiwagi, T., Suzuki, H., and Mochizuki, S.: Uncertainty evaluation due to the difference in definitions of the acceleration parameter to examine the influence of mean flow acceleration on the experimental turbulent flows, J. Phys.: Conf. Ser., 2369 (2022), 012012. [1] Suzuki, H., Nagata, K., Sakai, Y., and Hayase, T.: Direct numerical simulation of turbulent mixing in regular and fractal grid turbulence, Phys. Scr., T142(2010), 014065. [5] Lavoie P. , Djenidi L. , and Antonia R. A. : Effects of initial conditions in decaying turbulence generated by passive grids, J. Fluid Mech, 585 (2007), 395-420. [12] Suzuki, H., Mochizuki, S., and Hasegawa, Y.: Numerical-based theoretical analysis on effects of weak fluid acceleration of free-stream due to wind-tunnel blockage on grid-generated turbulence, Flow Meas. Instrum., 62 (2018), 1-8. [7] Shimada, K. and Meng, Y.: Applicability of modified k-e model on the prediction of aerodynamic properties of rectangular cylinders with various elongated cross sections, J. Struct. Construct. Eng., 63-514 (1998), 73-80 (in Japanese). [11] Suzuki, H., Mochizuki, S., and Hasegawa, Y.: Validation scheme for small effect of wind tunnel blockage on decaying grid-generated turbulence, J. Fluid Sci. Technol., 11-3 (2016), JFST0012 [9] Tamura, T. and Itoh Y.: Aerodynamic characteristics and flow structures around a rectangular cylinder with a section of various depth/breadth ratios, J. Struct. Construct. Eng.,61-486 (1996), 153-162 (in Japanese). [2] Huq, P. and Britter, R. E.: Mixing due to grid-generated turbulence of a two-layer scalar profile, J. Fluid Mech., 285(1995), 17-40. [6] Lavoie P , Burattini P , Djenidi L , and Antonia R. A. : Effect of initial conditions on decaying grid turbulence at low Rλ, Exp. Fluids, 39 (2005), 865-874. [3] Ito, Y., Nagata, K., and Komori, S.: The effects of high-frequency ultrasound on turbulent liquid mixing with a rapid chemical reaction, Phys. Fluids, 14-12 (2002), 4362-4371. [8] Nakaguchi, H. and Hashimoto, K., and Muto, S.: An Experimental Study on Aerodynamic Drag of Rectangular Cylinders, J. Japan Soc. Aeronaut. Eng.,16-168 (1968), 1-5 (in Japanese). [4] Mohamed, M. S. and Larue, J. C.: The decay power law in grid-generated turbulence, J. Fluid Mech., 219(1990), 195-214. |
| References_xml | – reference: [10] Kashiwagi, T., Suzuki, H., and Mochizuki, S.: Uncertainty evaluation due to the difference in definitions of the acceleration parameter to examine the influence of mean flow acceleration on the experimental turbulent flows, J. Phys.: Conf. Ser., 2369 (2022), 012012. – reference: [8] Nakaguchi, H. and Hashimoto, K., and Muto, S.: An Experimental Study on Aerodynamic Drag of Rectangular Cylinders, J. Japan Soc. Aeronaut. Eng.,16-168 (1968), 1-5 (in Japanese). – reference: [2] Huq, P. and Britter, R. E.: Mixing due to grid-generated turbulence of a two-layer scalar profile, J. Fluid Mech., 285(1995), 17-40. – reference: [9] Tamura, T. and Itoh Y.: Aerodynamic characteristics and flow structures around a rectangular cylinder with a section of various depth/breadth ratios, J. Struct. Construct. Eng.,61-486 (1996), 153-162 (in Japanese). – reference: [3] Ito, Y., Nagata, K., and Komori, S.: The effects of high-frequency ultrasound on turbulent liquid mixing with a rapid chemical reaction, Phys. Fluids, 14-12 (2002), 4362-4371. – reference: [11] Suzuki, H., Mochizuki, S., and Hasegawa, Y.: Validation scheme for small effect of wind tunnel blockage on decaying grid-generated turbulence, J. Fluid Sci. Technol., 11-3 (2016), JFST0012 – reference: [4] Mohamed, M. S. and Larue, J. C.: The decay power law in grid-generated turbulence, J. Fluid Mech., 219(1990), 195-214. – reference: [5] Lavoie P. , Djenidi L. , and Antonia R. A. : Effects of initial conditions in decaying turbulence generated by passive grids, J. Fluid Mech, 585 (2007), 395-420. – reference: [7] Shimada, K. and Meng, Y.: Applicability of modified k-e model on the prediction of aerodynamic properties of rectangular cylinders with various elongated cross sections, J. Struct. Construct. Eng., 63-514 (1998), 73-80 (in Japanese). – reference: [6] Lavoie P , Burattini P , Djenidi L , and Antonia R. A. : Effect of initial conditions on decaying grid turbulence at low Rλ, Exp. Fluids, 39 (2005), 865-874. – reference: [1] Suzuki, H., Nagata, K., Sakai, Y., and Hayase, T.: Direct numerical simulation of turbulent mixing in regular and fractal grid turbulence, Phys. Scr., T142(2010), 014065. – reference: [12] Suzuki, H., Mochizuki, S., and Hasegawa, Y.: Numerical-based theoretical analysis on effects of weak fluid acceleration of free-stream due to wind-tunnel blockage on grid-generated turbulence, Flow Meas. Instrum., 62 (2018), 1-8. |
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| SubjectTerms | Drag coefficient Fluid mechanics Grid turbulence Turbulence Wind tunnel experiment |
| Title | Wind Tunnel Experiment on Improving Efficiency of Low-Re Number Grid Turbulence Generation Focusing on Cross-Sectional Geometry of Grid Bars |
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