EXPERIMENTAL STUDY OF HYDRAULIC CHARACTERISTICS OF AIR FLOW IN SLOTTED GTE STATOR VANE COOLING CHANNELS.

The calculation of the pressure losses along the entire length of the slotted channels of vanes with internal deflectors is made using the Blasius relation. This relation is valid for fully developed turbulent flow, i. e. , beyond the segment of hydrodynamic stabilization of the flow. In the slotted cooling channels of gas turbine engine (GTE) vanes the hydrodynamic stabilization segment may constitute a significant part and sometimes a large part of the length. Analytic description of the stabilization conditions in this case is difficult, and use of the Blasius relation to calculate the losses may lead to large errors. In order to establish the dependence of the hydraulic resistance in the limits of the hydrodynamic stabilization segment on the flow regime for the slotted channels of deflector-type GTE vanes, we made a series of experiments on a specially designed stand.