An experimental investigation was carried out to study the turbulent flow behind passive grids in a subsonic wind tunnel. The enhanced level of turbulence was generated by five wicker metal grids with square meshes and different parameters (diameter of the grid rod d = 0.3 to 3 mm and the grid mesh size M = 1 to 30 mm). The velocity of the flow was measured by means of a one-dimensional hot-wire probe. For this purpose, skewness, kurtosis, and transverse variation of the velocity fluctuations were determined, obtaining knowledge of the degree of turbulence isotropy and homogeneity in the flow behind grids of variable geometry, for different incoming velocities U = 4, 6, 10, 15, 20 m/s. Approximately, the isotropic and homogeneous turbulence was obtained for x/M > 30. Next, several correlations for turbulence degeneration law were tested. Finally, as the main goal of the study, impact of turbulence intensity on bypass laminar–turbulent transition parameters (transition inception, shape parameter, and the length of the transition region) on a flat plate was investigated. Parameter ITum was created as an integral taken from the leading edge of the plate to the transition inception, divided by the distance from the leading edge to the transition inception, expressing in this way the averaged value of turbulence intensity.
Skip Nav Destination
Article navigation
Research-Article
Influence of Freestream Turbulence Intensity on Bypass Transition Parameters in a Boundary Layer
Zygmunt Wierciński
Zygmunt Wierciński
Search for other works by this author on:
Joanna Grzelak
Zygmunt Wierciński
1Corresponding author.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received November 2, 2015; final manuscript received November 19, 2016; published online March 14, 2017. Assoc. Editor: D. Keith Walters.
J. Fluids Eng. May 2017, 139(5): 051201 (7 pages)
Published Online: March 14, 2017
Article history
Received:
November 2, 2015
Revised:
November 19, 2016
Citation
Grzelak, J., and Wierciński, Z. (March 14, 2017). "Influence of Freestream Turbulence Intensity on Bypass Transition Parameters in a Boundary Layer." ASME. J. Fluids Eng. May 2017; 139(5): 051201. https://doi.org/10.1115/1.4035632
Download citation file:
Get Email Alerts
Cited By
Experimental Investigation of the Effect of Rake on a Bluff Body Equipped With a Diffuser
J. Fluids Eng (April 2025)
Related Articles
Forcing Boundary-Layer Transition on a Single-Element Wing in Ground Effect
J. Fluids Eng (October,2017)
Measurements of the Effects of Streamwise Riblets on Boundary Layer Turbulence
J. Fluids Eng (November,2017)
The Application of Different Tripping Techniques to Determine the Characteristics of the Turbulent Boundary Layer Over a Flat Plate
J. Fluids Eng (January,2018)
Uncertainty Evaluation of Friction Velocity Measurements by Oil-Film Interferometry
J. Fluids Eng (May,2017)
Related Proceedings Papers
Related Chapters
Cavitating Structures at Inception in Turbulent Shear Flow
Proceedings of the 10th International Symposium on Cavitation (CAV2018)
Antilock-Braking System Using Fuzzy Logic
International Conference on Mechanical and Electrical Technology, 3rd, (ICMET-China 2011), Volumes 1–3
Introduction
Design and Analysis of Centrifugal Compressors