Behavior of Cascaded Airfoils under Conditions of High Mean Loading and Flow Unsteadiness

摘要

The objectives of this research program were to measure the unsteady flow field in the rotor passage of an axial compressor and map this velocity field when operating near rotor blade stall. A laser doppler velocimeter system was developed for this purpose and used in conjunction with a single stage compressor designed expressly to facilitate these measurements. An extensive data acquisition system utilizing microcomputer components was designed and partially assembled an data processing algorithms were developed to yield the velocity mapping from the data. Various program sub-elements were completed, but a successful on-rotor velocity realization was not achieved at contract termination. Propagating stall was observed on the compressor and modelling studies using simulated inputs to the data processing system indicated a potential for successful unsteady velocity field mapping. (Author)