Taking the marine temperature difference energy power generation as the background

a 50 kW doubleturbine rotor system supported by gas bearings is designed. Moreover

by using ANSYS software

dynamics simulation calculation analysis on this system is carried out. Firstly

the modal analysis method is used to obtain the critical speed and natural frequency of the rotor system. Secondly

the harmonic response analysis is performed based on the modal analysis. The radial amplitude-frequency characteristic curve of the impeller is obtained and verifies that the rotor system can maintain stable operation. Finally

the centrifugal stress analysis of the impeller is carried out. The results show that

the critical speed of the dual-turbine rotor system is 16 241.0 r/min

and the designed operating speed meets the safety margin. The impeller will not collide with the nozzle when the system is subjected to external excitation force. The maximum deformation of the impeller appears at the tip of the blade

and gradually reduces from the top of the blade to the root. The maximum stress appears at the tip of the blade near the root of the shaft hole. The blades will not be damaged during working. The research results can provide certain theoretical basis for the test and structural optimization of dual-turbines.