Influence of cascade parameters on the deposition of small particles

Abstract

Present day turbine cascades are being optimized, usuaZZy,for minimum total pressure losses. Gas Turbines, however,operating in a dirty environment or using dirty fuels need cascades that minimize the erosion and the corrosion implications of the hostile environment of the flue gasses. The present study employs the parametric cascade optimization method by Mcdonald to study the influence of a number of parameters on the deposition velocity of various particZes,typicaZ of those in a PFBC Gas Turbine. The calculation code employs the TSONIC and the STAN5 codes plus the method of Stewart for the aerodynamic losses and two property chosen models for the eddy diffusion one. The results indicate that control is possible only for particles with a diameter of less than 10.0 pm and this usually at the expense of an increase in the aerodynamic losses.