PRELIMINARY ANALYSIS OF PROBLEM OF DETERMINING EXPERIMENTAL PERFORMANCE OF AIR-COOLED TURBINE I – METHODS FOR DETERMINING COOLING-AIR-FLOW

摘要

The problem of investigating air-cooled turbine performance is being analyzed. Suggested methods of investigating and analyzing data of such turbines so that performance characteristics can be obtained are being developed. Such an evaluation of a turbine requires knowledge of the flow characteristics of the cooling air in the blade cooling-air passages as the air proceeds from the roots to the tips of the blades. In the investigation of a tur¬bine, certain data must therefore be obtained and formulas" devel¬oped to obtain these flow characteristics.nThe methods that are expected to permit the determination of pressure, temperature, and velocity through the blade cooling-air passages from specific investigations that must be conducted are presented. Formulas are suggested relating these characteristics to certain parameters. The formulas must be verified and the coef¬ficients appearing therein evaluated by investigations of cooled turbines. Discussions of work that leads to the recommended for¬mulas are given in some cases.