Experimental contribution to the determination of blade forces in unsteady cascade flow

The characteristics of unsteady flows in turbomachines are very complex, and, for this reason, a complete understanding of the involved processes has not yet been possible. However, new developments, related to advances in measurement technology and electronic data processing, provide now a basis for the study of the periodically unsteady flow in a cascade. The present investigation is concerned with the study of the problems of unsteady flow by means of modern measuring procedures. A number of experimental studies conducted during the last 20 years make contributions to a better understanding of the unsteady flow effects in the turbomachine. However, data are needed for a direct comparison of experimental and computational results. In the current investigation, studies of the flow in a cascade are conducted by making use of a special wind tunnel installation. Attention is given to the experimental equipment, a description of the measuring systems, the conduction of the experiment, the measured data, and the determination of the unsteady blade forces.