Thermal analysis for fast start up of non-continuous rotor considering thermal contact resistance

The thermal-structure coupling analysis for bolted connection was modeled according to the structural features of non-continuous rotor, taking thermal contact resistance of rough surface into account. The time-varying relationship of temperature distribution and maximum stress during the fast start-up of the turbine was investigated. The influence of contact properties, such as roughness and pre-tightened force, on temperature distribution, tensioning force and maximum stress was analyzed. Results indicated that, the thermal contact resistance had great influence on temperature distribution of contact surface and maximum stress of bolted connection under the thermal impact, the contact property had influence on temperature distribution, deformation distribution and maximum stress. The research provides theoretical basis for the design of gas turbine, contributing to the analysis of thermally induced vibration and fault diagnosis.