INVESTIGATION OF GAS COMPOSITION EFFECTS ON THE AEROTHERMAL CHARACTERISTICS OF A FILM-COOLED FLAT PLATE AT HIGH-TEMPERATURE CONDITIONS

摘要

Both experimental and computational investigations were carried out in this paper to study the influences of turbine inlet steam concentration on turbine flow and heat transfer under high-temperature and pressurized conditions. A high-temperature experimental facility has been built to study the steam concentration effects on turbine aerothermal characteristics for future advanced turbines in IGCC power systems. Preliminary data were obtained from experiment and used to validate the computational models presented in this paper. Results from computational modeling were compared qualitatively with previous studies and also quantitatively with our experimental measurements in this study, both of which proves the validation of the presented computational approach. Based on the validated computational models, a series of numerical investigations were conducted. Relationship between the change in gas inlet steam concentration and the corresponding change in dimensionless spanwise-averaged heat flux distribution was found to be well correlated with the form of power function. The influence of turbine inlet pressure and temperature on the aerothermal characteristics of turbine heat transfer is also considered and discussed. Finally, an overall correlation based on the numerical investigations were presented, and the capability of this correlation was validated with full CFD computation. The correlation can predict the trend of the dimension-less spanwise-averaged heat flux quite well with an acceptable accuracy.