Title: Sensitivity analysis based on high fidelity simulation: application to hypersonic variable-cycle engine intake design

Authors: Hiromasa Kato, Keiichi Ito, Ingrid Lepot

Addresses: Multidisciplinary Optimisation Group, Cenaero rue des Freres Wright 29, Gosselies, B-6041, Belgium. ' Multidisciplinary Optimisation Group, Cenaero rue des Freres Wright 29, Gosselies, B-6041, Belgium. ' Multidisciplinary Optimisation Group, Cenaero rue des Freres Wright 29, Gosselies, B-6041, Belgium

Abstract: A sensitivity analysis of a supersonic intake of a turbine-based combined cycle (TBCC) engine is presented. A multi-block Reynolds-averaged Navier-Stokes (RANS) solver was used to compute the flowfield. While RANS simulation provides more realistic performance estimate than a simplified cycle analysis, the intake design must also take into account in-flight uncertainties for robustness. In this study, we focus on the effect of geometric uncertainties on the intake performance, and propose a practical approach to simulation-based sensitivity analysis. The method begins by constructing a radial-basis function (RBF) network, trained via efficiently sampled simulations. Using the RBF network as the surrogate model, sensitivity analysis is performed using the analysis of variance (ANOVA) technique. This approach makes it possible to perform a generalised multi-input-multi-output sensitivity analysis based on high-fidelity simulation. The resulting sensitivity indices help identify dominant parameters as well as the interaction among multiple parameters, which can then be used for design refinement.

Keywords: sensitivity analysis; surrogate modelling; Reynolds-averaged Navier-Stokes; RANS; high fidelity simulation; hypersonic variable-cycle engines; engine intake design; turbine-based combined cycle; TBCC engines; in-flight uncertainties; ANOVA; radial-basis function; RBF neural networks.

DOI: 10.1504/IJESMS.2010.031869

International Journal of Engineering Systems Modelling and Simulation, 2010 Vol.2 No.1/2, pp.38 - 45

Published online: 27 Feb 2010 *

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