Optimizing a Boundary-Layer-Ingestion Offset Inlet by Discrete Adjoint Approach

• Published in: AIAA journal 2010-09, Vol.48 (9), p.2008-2016
• Main Authors: Lee, Byung Joon, Liou, Meng-Sing, Kim, Chongam
• Format: Article
• Language: English
• Subjects: Adjoints; Aerodynamics; Air transportation and traffic; Applied sciences; Boundaries; Compressors; Computational fluid dynamics; Computational methods in fluid dynamics; Control surfaces; Convergence; Degradation; Design engineering; Distortion; Engines; Entrances; Exact sciences and technology; Flow characteristics; Flow distortion; Fluid dynamics; Fluid flow; Flushing; Fundamental areas of phenomenology (including applications); Geometry; Ground, air and sea transportation, marine construction; Inlets; Mathematical models; Numerical dissipation; Offsets; Optimization; Performance enhancement; Physics; Pressure; Pressure loss; Pressure recovery; Reduction; Sensitivity analysis; Shape optimization; Surface geometry; Turbulence; Turbulent flow
• ISSN: 0001-1452; 1533-385X
• DOI: 10.2514/1.J050222

A large amount of low-momentum boundary-layer flow ingesting into a flush-mounted inlet can cause significant total pressure loss and distortion to the extent beyond operability of a fan/compressor. To improve the quality of incoming flow into the engine, shape optimization of the surface geometry at the inlet entrance has been carried out using the discrete adjoint method; the inlet-floor shape is parameterized by the use of control points on B-spline surface patches.Toresolve the complicated geometry flexibly and wall-bounded turbulent flowaccurately, an overset mesh system is well-suited for integrating the flow analysis code, sensitivity analysis code, and grid modification tools. To enhance the convergence characteristics of the sensitivity analysis code, additional numerical dissipation for the discrete adjoint formulation is introduced. After using this optimization procedure, the new inlet yields a significant improvement in performance: a more than 50% reduction in flow distortion and a 3% increase in total pressure recovery. High performance at off-design conditions is also realized with only slight degradation, confirming the capability of the adjoint method for a practical design problem. Finally, the physical meaning and implication of the performance improvement are elaborated upon in relation to the flow characteristics resulting from the new design . [PUBLICATION ABSTRACT]