We propose the expected integrated mean-squared error (EIMSE) experimental design criterion and show how we used it to design experiments to meet the needs of researchers in die casting engineering. This criterion expresses in a direct way the researchers' goal to minimize the expected meta-model prediction errors, taking into account the effects of both random experimental errors and errors deriving from our uncertainty about the true model form. Because we needed to make assumptions about the prior distribution of model coefficients to estimate the EIMSE, we performed a sensitivity analysis to verify that the relative prediction performance of the design generated was largely insensitive to our assumptions. Also, we discuss briefly the general advantages of EIMSE optimal designs, including lower expected bias errors compared with popular response surface designs and substantially lower variance errors than certain Box-Draper all-bias designs. Copyright 2003 Royal Statistical Society.
This paper describes a new gas turbine research facility that was designed and is currently being constructed with a number of unique features that allow experiments which aim at developing and improving sealing and cooling technologies at a reasonable cost. Experiments will include engine-representative rotating turbine hardware in a continuous, steady-state, high-pressure flow environment. The facility includes a 1.5 stage turbine that will simulate the aerodynamic flow and thermal field interactions in the engine between the hot mainstream gas path and the secondary air flows at relevant corrected operating conditions and scaling parameters. Testing in the new facility is planned to begin in 2014 and will take place in two phases. The first phase is focused on understanding the behavior of inner-stage gap flow leakages in the presence of the main gas path and the rotating blade platform. The second phase is focused on developing and testing novel cooling methods for turbine airfoils, platforms, and disks, ultimately leading to an integrated approach for more effective use of the secondary cooling flow. The uniqueness of this facility includes a continuous duration facility with engine-relevant rotational and axial Reynolds and Mach numbers at the blade inlet.
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