The calibration of DISA hot film probes for use on a HST train travelling through chipping Sodbury and Patchway tunnels (IM-AERO-115)

1. INTRODUCTION 1.1 During 1978 a series of Aerodynamic tests were carried out in Chipping Sodbury and Patchway Tunnels (ref 9). The primary requirement for these tests was the measurement of transient pressures and draught velocities. In addition, it was decided to attempt to measure the local skin friction...