Blade Loading of Transonic Circular Cascade Diffuser.

Abstract

A low-solidity circular cascade, conformally transformed from a high-stagger linear cascade of double-circular-arc vanes with solidity 0.69, was tested as a part of the diffuser system of a transonic centrifugal compressor, and the blade loading of the cascade was investigated by means of pressure measurement around the vane. The experimental data for the lift-coefficient of the vane were almost on a single straight line when plotted against angle-of-attack for a wide range of Mach numbers and flow angles. The maximum lift-coefficient reached about 1.5 and the vane functioned well even near the surge condition of the compressor.