Robust Parameter Design Methodologies for Optimal Micro-Scale Secondary Flow Control in Compact Inlet Diffusers

摘要

It is the purpose of this report to study and evaluate three optimal Robust design methodologies for application towards micro-scale secondary flow control (MSDC) for the management of inlet recovery, engine face distortion and High Cycle Fatigue (MCI) in compact inlet diffuser. The three Robust methodologies include: (1) the traditional Taguchi Robust Parameter Design methodology, (2) a "Higher Order" Robust method, which used the same DOE structure as Taguchi, but with an alternate analysis, and (3) a "Lower Order" economical approach to Robust Design, where a single DOE was established which was composed of both the inner array (design) variables and outer array (mission) variables. Each of the three Robust methodologies examined in this report, (i.e., the Taguchi methodology, the "Higher Order" methodology. and the "Lower Order" methodology) provided installation designs that satisfied the mission requirements. Even though all three methodologies were capable of finding a robust optima that satisfied the mission requirements, the "Lower Order" method provides an economical alternative where the number of runs is drastically reduced.