CFD Investigation on 3-Dimensional Interference of a Five-Hole Probe in an Automotive Wheel Arch

Abstract

Detailed flow measurements are essential for analysing flow structures found in confined spaces, particularly in various automotive applications. These measurements will be extremely helpful in solving flow dependent complexities. Although considerable progress has been made in computational techniques for investigating such flows, experimental flow measurements are still very difficult to carry out therein. Flows mapped using an array of robust instruments like multi-hole pressure probes can provide significant insight into the flow field of such complex flows. Pressure probes can withstand the harsh environments found in such applications; however being intrusive devices significant interference in flow field can limit their applicability. This paper presents an investigation of three-dimensional interference caused by multi-hole pressure probes in an automotive wheel arch. It involves simulation of flow around a pressure probe inserted at various locations within the wheel/wheel arch gap. Pressure and velocity fields along longitudinal and lateral planes have been mapped and the extent of interference caused by the probe along three orthogonal axes has been presented. A three-dimensional ellipsoid of interference has been defined to assist in recommending optimal placement of probes and minimise the error due to interprobe interaction, thus enhancing the measurement accuracy of transient flow phenomena.

Effect of Chamfer Angle on the Calibration Curves of Five Hole Probes

“…Five hole probes also find applications in other flows (automotive wheel arch flow, Malviya et al [2], supersonic flow measurements, Naughton et al [3] and Milanovic and Kalkhoran [4]). Five hole probes also find novel applications, such as measurement of skin friction in complex two-and three-dimensional flows Lien and Ahmed [5].…”