Development of a Method for Measuring Velocity at the Exit of a Compressor Rotor Using Kulite Probes with Synchronized Sampling.

摘要

Initial steps are reported in the development of a method for determining the instantaneous velocity vector at the exit of a compressor rotor using two Kulite pressure probes with synchronized sampling. A method to determine the yaw angle of the flow at any point in the reference frame of the rotor using a single cylindrical Kulite impact probe and an equivalent pneumatic probe is described. The method was verified in the steady flow of a free jet and applied in the unsteady flow field of the compressor. On-line calibration of the Kulite probe with reference to the pneumatic probe was essential to the success of the method. Results for the distribution of the yaw angle peripherally across the exit of chosen pairs of rotor blade passages, are given. The analytical approximation of impact probe characteristics, on which the method is based, and its application with experimental data are described. (Author)