Investigation of the Two-dimensional Performance of Supersonic Impulse Turbine Blade Cascades : (1st Report, General Characteristics of Blade Cascades)

Abstract

Some kinds of design methods of supersonic impulse turbine blade cascades have been already published. However, many problems have remained unsolved concerning the performance of the cascades designed by such methods because of the lack of systematic test data. In this investigation, two-dimensional cascade tests were carried out on four kinds of cascades designed by use of supersonic vortex flow, each of which has different turning angle and inlet Mach number at design condition. As the result, the general characteristics of these cascades, such as the variation of performance with inlet Mach number and back pressure and the correlation between the performance and turning angle or inlet Mach number at design condition, have been clarified.