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Recent Advances in Flow Field Mapping Techniques
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English
Abstract
Flow field mapping techniques have been regarded with great interest in recent years. They are an important tool for investigating flow characteristics around new car models during their development in the wind tunnel.
A short summary of previous techniques developed by Pininfarina, since 1982, is reported. Latest developments are then shown, which include:
- A new probe, capable of measuring local pressures and velocities both in straight and reverse flows. It utilizes a “fourteen-hole” pattern which overcomes most of the limitations previously found with “seven-hole” probes.
- The upgrading of the wind tunnel traversing system, both in its hardware and software components.
Probe traversing velocities up to 120 mm/sec are now commonly used during the pressure data acquisition.
Furthermore pressures and velocities may now be mapped along planar surfaces being horizontal or vertical, transversal or longitudinal, in front of, at the side of, or behind the car model.
Examples of maps plotted using the new probe and/ or the new features of the traversing system, are reported in the second half of the paper. Main indications provided by these maps are also outlined.
Finally in the appendix, the main characteristics of the updating of the Pininfarina wind tunnel to the end of 1986 are reported.
This includes changes made to the drive system, fan and other parts of the facility.
Citation
Cogotti, A., "Recent Advances in Flow Field Mapping Techniques," SAE Technical Paper 870718, 1987, https://doi.org/10.4271/870718.Also In
References
- “Aerodynamic flow visualization techniques and procedures” SAE information Report HS J1566 January 86
- Crowder J.P. “Quick and easy flow field surveys” 38 Astronautics and Aeronautics October 80
- Cogotti A. “A passenger car wake survey using coloured isopressure maps” Third international Symposium on Flow Visualization Ann Arbor September 83
- Cogotti A. “Wake surveys of different car-body shapes with coloured isopressure maps” SAE paper 840229 Detroit February 84
- Cogotti A. “New measurement techniques in the wind tunnel” Autotechnologies Montecarlo 85 February 85
- Cogotti A. “Car-wake imaging using a seven-hole probe” SAE paper 860214 Detroit February 86
- Gallington R. Sisson G. “Flow visualization using a computerized data acquisition system” Second international Symposium on Flow Visualization Bochum. September 80
- Gerner, Maures Gallington “Non-nulling-seven-hole probes for high angle flow measurement” Experiments in Fluids 2 95 103 Springer-Verlag 1984
- Cogotti A. “Flow field surveys behind three squareback car models using a new fourteen-hole probe” presented at 1987 SAE Congress Detroit February 87