(State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China)
Based on finite element simulation, the friction-heating effect and temperature variations during rub-impact between blade and casing of rotor were studied. During a single rub-impact process, the asymmetric thermal effect exists due to the radiant area difference of the blade and the case. During a cycle of blade rotation, there is also an asymmetric thermal effect during the process due to different rubbing times of the blade and the case. This multiple asymmetric thermal effect makes the temperature distribution and change curve of the blade tip and the case appear distinct. The temperature rise of the blade only occurs in the process of rub-impact, and the temperature of the blade continues to decrease due to the convective heat transfer of air in the remaining time. However, the temperature of the case increases slowly because the case rubs with different blades, and the temperature drops during the interval time of the casing rubbing with two adjacent blade tips. Therefore, the temperature rise curve of the case increases in a fluctuating manner.