Affiliation of Author(s):能源与动力学院

Journal:APPLIED THERMAL ENGINEERING

Key Words:Gas turbine Thermal radiation Hot streak Blade heat load Transient numerical simulation

Abstract:Hot Streak (HS) and thermal radiation are the two important factors affecting the heat transfer process in High Pressure (HP) turbine stage, while the previous investigations were limited in studying either of them independently. In order to investigate the combined effects of the HS and radiation, the present study is aimed at unsteady convection-radiation coupled simulations with regards to HS and uniform inlet conditions. Three dominant radiative factors were analyzed in details. Compared with the uniform cases, it is found that there are two high temperature regions in the rotor passages of HS cases. The maximum temperature increase of the vane surface is about 40 K caused by radiation. As the HS changes the temperature distribution, the radiative heat flux is redistributed and a portion of radiative heat flux transfer from the stator passage to the rotor passage. The turbine inlet radiation mainly affects on the guide vane, whereas the gas radiation has a more significant influence on the rotor blade heat load.

ISSN No.:1359-4311

Translation or Not:no

Date of Publication:2018-06-25

Co-author:Wang, Tianyi,Han, Xingsi

Correspondence Author:xym