Velocity Mapping of Turbulent Wakes of Hypersonic Spheres with Arrays of Ion Probe Pairs
DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC)
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The technique of measuring convection velocity in the hypersonic wake with a pair of in-line probes has been applied on a large scale to the mapping of the velocity field in the hypersonic wake through the use of a transverse survey array containing up to 8 ion-probe pairs. Measurements are reported of the velocity field in the wakes of 2.7 inch diameter spheres flown at 14,500 feetsecond in ballistic range atmospheres at 7.6 torr and at 20 torr of nitrogen. The array technique leads to convection velocity results which are in excellent agreement with the mean wake velocity data obtained by the sequential spark technique in an air atmosphere.
- Test Facilities, Equipment and Methods
- Fluid Mechanics