Flow-Field Surveys Behind Three Squareback Car Models Using a New “Fourteen-Hole” Probe

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Flow-Field Surveys Behind Three Squareback Car Models Using a New “Fourteen-Hole” Probe

Cogotti, Antonello

The flow-field mapping technique previously developed in the Pininfarina wind tunnel has further evolved during 1986.The former technique (1985), based on the use of a “seven-hole” probe, had two main limitations: Both these conditions often occur inside the near-wakes of passenger-car models.Therefore, wake maps (velocities and pressures) made in the past were largely incomplete in their inner parts.The new probe has a double “seven-hole” pattern and its performance exceeds that of two “seven-hole” probes used separately.It was developed during the fourth year of a research program aimed at providing new experimental information on reverse flows in automobile wakes, for use in developing improved computational fluid dynamic (CFD) techniques for automobiles.Reverse flows inside the near-wake of three full-scale squareback car models were investigated.One of these models is the same as was tested in the past. The other two differ slightly in their rear-end shape from the first one.The main characteristics of the new probe and its performance are presented and compared with the “seven-hole” probe.Furthermore, the maps of velocities and pressures measured in the wakes of the three squareback car models are reported.