A TRANSONIC COMPRESSOR STAGE PART1: EXPERIMENTAL RESULTS

摘要

The results of an experimental program to test a transonic compressor stage are presented. The stage was designed using computational fluid dynamic (CFD) techniques to minimize the use of empirical methods. The main performance characteristics of the stage are presented along with a description of the test rig. Some of the technical difficulties and solutions implemented in sustained testing of a transonic stage are outlined. Equations used to mass average the pressure and temperature ratio, to derive the isentropic efficiency and a method of measuring losses due to the case-wall are presented. Results from the experimental program for 70, 80, 90 and 100% speeds for rig open throttle to near stall are presented. Stall occurred at all speeds except 100%, where it was avoided due to rotor stress concerns. Quantitative performance maps of stage total-to-total pressure ratio and isentropic efficiency were determined. In addition, a map showing the losses due to the case-wall is presented. The total-to-total stagnation pressure and temperature profiles at the exit to the stage over the entire test range were measured and used to calculate the isentropic efficiencies. Static pressure measurements along the case-wall and hub-wall through the stage are presented. The experimental program has yielded data from a transonic compressor stage that can be used in the validation of CFD codes and evaluation of the original design methods.