Reliability analysis of reusable turbine rotor blisk: An application of
parametric modelling method under multi-field coupling
Abstract
A reliability analysis framework is constructed by combining parametric
modelling methods with finite element analysis methods under
fluid-thermal-solid sequential coupling. The influence of blade profile
changes due to machining errors on the reliability of turbine rotor
blisks in reusable rocket engines (RRE) is investigated. The effects of
machining errors, material, and load variability on the cyclic life
reliability of rotor blisks are effectively quantified. With the
suggested method, a reliability analysis is conducted for an RRE turbine
rotor blisk, and the effect of the machining error range on the analysis
results is investigated. It is found that when the reliability
requirements are 0.85, 0.9, and 0.95, the general tolerance grades to
satisfy the reliability requirements are the coarsest grade, the medium
grade, and the precise grade, respectively. The highest sensitivity
coefficient in cyclic life reliability is 29.09% for the blade axial
chord. This study provides valuable insights and recommendations for the
reliability design and optimization of reusable turbine rotor blisks.