Reliability analysis for HPT blade-tip radial running clearance based on DCRSM

In order to design more effectively aeroengine high pressure turbine (HPT) blade-tip radial running clearance (BTRRC), a BTRRC reliability analysis is accomplished from a probabilistic perspective in this paper. Distributed collaborative response surface method (DCRSM) with high accuracy and high efficiency is proposed for reliability analysis according to the structural features of BTRRC. The mathematical model of DCRSM is established based on the quadratic response surface function. The DCRSM is applied to the reliability analysis of an aeroengine HPT BTRRC to verify the advantages. The reliability analysis results show that the reliability of BTRRC is 0.9968 when the static blade-tip clearance δ=1.86 mm, which is appropriate in the BTRRC and aeroengine design for satisfying engineering requirements while considering synthetically the efficiency and reliability of an aeroengine. As demonstrated in the comparison of methods, the DCRSM can not only make a difficult problem easy to resolve, but also improve greatly computation speed, save computing time and ameliorate computational efficiency while keeping calculation accuracy. Therefore, DCRSM is fully verified to be feasible and effective in BTRRC reliability analysis. Meanwhile, the present study provides some useful insight into designing and optimizing more effectively complex machinery reliability schemes in general.