A reasonable method of choosing speed ratio and degree of reaction for small radial turbines was described

and a one-dimensional design code OCC(one-dimensional computer code)was programmed by analyzing all kinds of restriction factors on the speed ratio and degree of reaction.The code OCC was used for the design of nozzle and rotor blade of a 600kW simple cycle gas turbine taken from the literature.The OCC results were compared with the results of the design and analysis code OFC(one-dimensional computer FORTRAN code)in the literature.The results were in agreement

and the total static isentropic efficiency of the radial turbine designed by OCC was larger than that designed by OFC.The comparison between the CFD(computational fluid dynamics) simulation resulted that and the OCC results for the radial turbine shows the discrepancies were lower than 10%.In conclusion

the present design method and the one-dimensional design program are appropriate to the preliminary design of micro radial turbines.