NACA-RM-L54I13

Abstract

INTRODUCTION <br>Two-dimensional cascade data obtained in a porous-wall test facility are extensively used in the design of axial-flow compressors. Since the flow in axial-flow compressors is three-dimensional, a correlation between cascade and compressor-rotor data is required. Pressure distributions and turning angles measured for a rotor have been shown in reference 1 to be similar to those measured in cascade at the design angle of attack. Reference 2 indicates that rotor performance data can be estimated accurately from cascade data for a wide variety of conditions. The purpose of the present investigation is to further the establishment of a correlation between low-speed cascade and compressor-rotor data over a wide range of blade-setting angles. <br>A rotor having medium-camber NACA 65-series airfoil sections, was tested without guide vanes or stators over a wide range of blade-setting angles in a low-speed 28-inch test blower. Measured overall and blade-element performance values were compared with values estimated by using two-dimensional porous-wall cascade data. To facilitate this work, the rotor was designed with constant solidity along the radius.