Numerical Simulation And Analysis Of Fluid Thermal Structure Coupling On Impellers Of Turbo-expander

Turbo-expander is an essential air separation equipment for importantindustries such as metallurgical, petrochemical, thermal power and so on.With the intensified development of these domains, turbo-expander ismoving towards huge scale and low power consumption, which will surelydemand a much higher technology level on design and manufacture,reliability analysis, breakdown diagnosis and nonlinear dynamics. Amongthe above-mentioned difficulties, the Fluid-Thermal-Structure coupling onimpellers is a comprehensive problem for the technical breakthrough ofturbo-expander. Therefore, intensive study of coupling analysis field willimprove the ability of independent design and manufacture of large scaleturbo-expander.This paper focused on the Fluid-Thermal-Structure coupling problemby numerical simulation with steady working condition of turbo-expanderand analyzed the influence of coupling action on the performance of rotorsystem’s components.Firstly, the flow fields inside the impellers were calculated andanalyzed by Computational Fluid Dynamics method to get the distributionof state parameters, which would provide boundary condition and loaddata for coupling analysis.Then, according to the real working condition of rotor system and theinteractions between different physical fields, a calculation scheme ofFluid-Thermal-Structure one way coupling was put forward to realize thestrength analysis of rotor system under coupling stress. The static analysisindicated that the rotor system met design requirements.Finally, the vibration characteristic of impellers and rotor system wasanalyzed and the result showed the structure was qualified for dynamicperformance. Furthermore, a calculation scheme of Fluid-Structure twoways coupling based on steady temperature field was proposed to do some study on blade aero-elasticity phenomenon. It was proven that the bladeflutter didn’t take place.The approach of Fluid-Thermal-Structure coupling analysis in thispaper provides a meaningful reference for comprehensive engineeringproblems containing multi-physics coupling action.