Calibration of vortex tunnel.

A description is given of the installation layout of the tunnel in its temporary building on the University site at Sandy Bay. Investigation of the tunnel flow has revealed that it is satisfactory from the points of view of symmetry and freedom from separation for the proposed blade testing. Curves for mass flow versus intake pressure drop have been drawn. An initial deflection in one piece of the drive Shaft causes considerable vibrations in the outlet section at approximately 400 r.p.m. away from that speed the vibrations are negligible. Suggestions are made within for future improvement in instrumentation to obtain the three dimensional flow measurement in the working section.