New Approach to Axial Compressor Cascade Testing Technique 500179
THE inadequacy of existing cascade data to satisfy 2-dimensional flow criteria is discussed in this paper.
It presents the results of an investigation to determine the influence of aspect ratio, boundary-layer control by means of slots and porous surfaces, Reynold’s number, and tunnel end-wall condition upon the performance of airfoils in cascades.
A representative compressor blade section, the 65-(12) 10 airfoil, was tested in low-speed cascades of aspect ratios of one, two, and four with solid and with porous side walls.
The authors report that 2-dimensional flow was established in porous-wall cascades of each of the three aspect ratios tested; the flow was not 2-dimensional in any of the solid-wall cascades.