Probabilistic Design of HPT Blade-Tip Radial Running Clearance with Distributed Collaborative Response Surface Method

To develop the high-performance high-reliability of aeroengine, the probabilistic design of high-pressure turbine (HPT) blade-tip radial running clearance (BTRRC) with three objects (disk, blade, and casing) and two disciplines (heat and mechanical loads) was completed based on distributed collaborative response surface method (DCRSM) from a probabilistic perspective considering dynamic loads and nonlinear material properties. The mathematical model of DCRSM was established based on the quadratic response surface function. The basic idea of BTRRC probabilistic design based on DCRSM was introduced. The BTRRC probabilistic analysis results, consisting of the probabilistic distribution characteristics of input-output variables, the failure probability, and reliability of BTRRC under different static blade-tip clearances delta and the major factors affecting the BTRRC, reveal that the static blade-tip clearance delta = 1.865 x 10(-3) m is an optimally acceptable option for BTRRC design. The comparison of methods shows that the DCRSM has high accuracy and high efficiency in the BTRRC probabilistic analysis; meanwhile, the strengths become more obvious with the increasing times of simulations. The present research offers an effective way for HPT BTRRC probabilistic design, as well as provides a promising method for the further probabilistic optimal design of complex mechanical system. (C) 2014 American Society of Civil Engineers.