ANALYTICAL DETERMINATION OF LOCAL SURFACE HEAT-TRANSFER COEFFICIENTS FOR COOLED TURBINE BLADES FROM MEASURED METAL TEMPERATURES

摘要

Analytical methods for the determination of local values of outside and inside heat-transfer coefficients and effective gas tem-peratures from turbine-blade-temperature measurements were developed. Temperature-distribution equations are derived for typical turbine-blade configurations at the central section when the wall thickness is uniform, at the leading-edge section, and at the trailing-edge section. The equations have the same general form for all sections of the blade, but the blade configuration at the location where the data measurements are taken affects the evaluation of some terms in the general equation.nProcedures for applying these analytical methods to experimen¬tally measured blade-metal temperatures are presented. Data are presented for the leading and trailing edges of a symmetrical water-cooled blade to illustrate the validity of the methods for those portions of the blade.