Design and experiment study of a micro radial-flow turbine for a SOFC-MGT turbine hybrid system

Abstract

Since compact structure and centimeter size of solid-oxide fuel cell system equipped with micro gas turbine (SOFC-MGT), the heat of a micro radial-inflow turbine (RIT) is transferred to compressor through wall heat transfer. In this work, an integrated design method considering wall heat transfer was proposed to develop an efficient micro-RIT applied to c. The one-dimensional design method considering wall heat transfer was established according to theoretical analysis and empirical correlations. The geometric structure of micro-RIT was produced based on the distribution of blade angle, blade thickness and meridional streamline. The structural parameters were optimized by three-dimensional numerical simulation of fluid-thermal-structural coupling to obtain the best geometric model of micro-RIT. A new test method was employed to verify the accuracy of the integrated design method. The results indicate that the integrated design method under adiabatic condition and considering wall heat transfer have the same design accuracy for the mass flow of micro-RIT. However, compared with the integrated design method under adiabatic condition, the integrated design method considering wall heat transfer has better design accuracy for the efficiency of micro-RIT. The maximum error of integrated design method under adiabatic condition is 3.53%, that of integrated design method considering wall heat transfer is 2.71%.