EFFECT OF CERTAIN COMBINATIONS OF WALL CONTOURING AND DESIGN EXIT VELOCITY DISTRIBUTION ON PREDICTION OF TURBINE-NOZZLE MASS FLOW

摘要

An investigation was conducted to determine if certain combinations of design nozzle-exit velocity distribution and wall contouring, employed to increase annulus area, can alter the three-dimensional flow characteristics such that nozzle mass flow cannot be predicted by ordinary two-dimensional design techniques. Four nozzle configurations with different wall contours and velocity distributions were analyzed in the axial-radial plane (axial symmetry was assumed) to determine the effect of the three-dimensional flow characteristics on the maximum mass flow. The accuracy -Of the method of analysis was established by comparing the maximum mass flow obtained by analysis with the maximum obtained experimentally.