Problem of Determining Delivery Coefficients and Angles of Outflow from Bladed Devices of Axial Gas Turbines

摘要

Utilization of results of air blasting grills in static conditions when planning blading of gas turbines may lead sometimes to large errors in the aspect of determining flow out angles and, in consequence, power and efficiency of GTU. Delivery coefficients and angles of outflow from turbine grills should be determined by results of testing model stages in rotation or by calculation. Use of methods for the calculation of potential flow around profiles with an incompressible fluid, considerably facilitates the problem of planning blading. Determination of velocity curve of an incompressible flow on a profile and outflow angles with consideration of compressibility and viscosity should precede any experimental investigation of grill. Industrial tests confirmed the advisability of employing calculation methods in determining delivery characteristics of blading when planning gas turbines. (Author)